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Background: Ankle fracture surgeries are generally safe and effective procedures; however, as quality-based reimbursement models are increasingly affected by postoperative readmission, we aimed to determine the causes and risk factors for readmission following ankle fracture surgery. Methods: Ankle fracture cases were identified from the prospectively collected American College of Surgeons National Surgical Quality Improvement Program from 2013 to 2014. Demographics, comorbidities, and fracture characteristics were collected. Rates of 30-day adverse events and readmissions were determined as well as the causes for readmission. Multivariable logistic regression analyses were performed to identify risk factors associated with having any adverse events and being readmitted within 30 days of surgery. Results: There were 5056 patients included; 167 (3.3%) were open fractures. The rate of any postoperative adverse event was 5.2%. There were 116 unplanned readmissions, with a readmission rate of 2.3%. Of the 116 unplanned readmissions, 49 (42.2%) were for reasons related to the surgery or surgical site, with the most common causes being deep surgical site/hardware infections (12.9%), superficial site infections (11.2%), and wound disruption (6.9%). Most readmissions were for reasons unrelated to the surgical site (51.7%), including cardiac disorders (8.6%), pulmonary disorders (7.8%), and neurological/psychiatric disorders (6.9%). The cause of readmission was unknown for 6% of readmissions. With multivariable logistic regression, the strongest risk factors for readmission were a history of pulmonary disease (odds ratio [OR], 2.29), American Society of Anesthesiologists (ASA) class ≥3 (OR, 2.28), and open fractures (OR, 2.04) (all P < .05). Conclusion: In this cohort of 5056 ankle fracture cases, 2.3% of patients were readmitted within 30 days, with at least 51.7% of all unplanned readmissions due to causes unrelated to the surgery or surgical site. Predictors of readmission included a history of pulmonary disease, higher ASA class, and open fractures. Based on these findings, we advocate close medical follow-up with nonorthopaedic providers after discharge for high-risk patients. Level of Evidence: Level III.

Category: Ankle Arthritis Introduction/Purpose: Radionuclide bone scintigraphy in combination with computed tomography (CT) has been used to evaluate painful total hip and knee arthroplasties, and has also been used in the evaluation of the painful total ankle arthroplasty (TAA). Increased tracer uptake around implants may indicate loosening, but uptake characteristics of bone-seeking radiopharmaceuticals in asymptomatic total ankle patients have not been clarified. While findings of increased metabolic activity may prompt surgical intervention, there has been no work performed to define when postoperatively periprosthetic activity normalizes, if at all. In this study, we plan to establish normative data on 18F sodium fluoride (18F-NaF) positron emission tomography/CT (PET/CT) uptake ratios around TAA implants at various time intervals after surgery in asymptomatic TAA patients. Methods: The majority of the arthroplasty literature has investigated use of SPECT/CT performed with 99mTc-labeled bisphosphonates. However, data suggest that 18F-NaF PET/CT may be superior for this indication, with more favorable pharmacokinetics and similar sensitivity to detect aseptic loosening. In the present study, asymptomatic patients who underwent TAA with a modern fixed-bearing TAA prosthesis (either the Wright Infinity Adaptis or Exactech Vantage prosthesis) for posttraumatic arthritis were eligible for inclusion. Patients with ipsilateral hindfoot fusion and with any periprosthetic lucencies or cysts were excluded. Patients were enrolled at one of four time intervals following TAA: 6, 12, 18, or 24 months. Standard uptake values were measured at the bone-implant interface for the tibial and talar components on static PET, in regions of interest defined on axial CT scan slices. Periprosthetic bone blood flow (K1) and bone turnover (flux) were assessed at each time interval in each periprosthetic region using dynamic PET. Results: Sixteen asymptomatic patients underwent PET/CT: 4 patients at 6 months postoperatively, 6 at 12 months, and 6 at 24 months. We are currently still in data collection and at this time only 2 patients at 18 months have completed the scan, therefore their data were excluded. The average age was 65 years (range, 55 to 80) and 6 patients were female (38%), with individual patient data shown in the Table. Talar K1 and flux both appeared to increase from 6 to 12 months, and decrease between 12 and 24 months, although there was no statistically significant difference between timepoints. Overall tibial K1 and flux appeared to decrease slightly from 6 to 12 months, and stayed relatively stable between 12 and 24 months, again with no significant difference between timepoints (Figure). Conclusion: There is currently no normative data to help guide interpretation of radionuclide bone scintigraphy for the painful TAA. The present study utilizing 18F-NaF PET/CT scans demonstrates that even in asymptomatic patients, periprosthetic bone blood flow and bone turnover remain elevated up to 24 months following modern fixed-bearing TAA. Not only do these values remain elevated at 24 months, but we found that there does not appear to be any significant decrease in either measurement over time from 6 to 24 months postoperatively. Our findings suggest that radionuclide bone scintigraphy should be cautiously interpreted when performed within 2 years of TAA.

Category: Midfoot/Forefoot; Bunion Introduction/Purpose: Hallux valgus (HV) is recognized as a triplanar deformity comprising axial abduction, sagittal hypermobility, and coronal pronation of the first metatarsal. A first tarsometatarsal (TMT) arthrodesis may be used to address all three planes of deformity. The Lapiplasty system (Treace Medical Concepts, Inc., Ponte Vedra, FL) was developed to reproducibly address triplanar deformity. However, the Lapiplasty system is costlier than other fixation constructs. Because healthcare is increasingly value-focused, we sought to determine if the more expensive Lapiplasty system improved radiographic outcomes or decreased complication rates over standard cross-screw fixation. We hypothesized that HV patients undergoing first TMT arthrodesis with the Lapiplasty system would have equivalent radiographic correction and similar complication rates when compared to patients treated with cross-screw fixation. Methods: In this multi-center, IRB-approved retrospective study, consecutive series of patients who underwent 1st TMT arthrodesis for HV, either with cross-screw fixation at Institution A, or Lapiplasty at Institution B, were identified by registry search. Inclusion criteria included age over 18 and preoperative and minimum 6-month postoperative weight-bearing AP and lateral radiographs. Exclusion criteria included primary conditions other than hallux valgus and previous first ray surgeries or ipsilateral arthrodeses. Hallux valgus angle (HVA), intermetatarsal angle (IMA), and tibial sesamoid position (TSP) were measured preoperatively and at final follow-up, and clinic notes were reviewed to identify complications and reoperations. To compare cohorts, Mann-Whitney U tests and Fisher's Exact tests were applied for continuous and discrete variables, respectively. To examine preoperative-postoperative changes, Wilcoxon signed rank tests were used. Multivariable regressions tested the effect of fixation constructs on postoperative radiographic parameters, adjusted for preoperative radiographic measurements, age, sex, and BMI. Results: 65 patients were included in each group, with 121 (93.8%) female patients, mean (SD) age 54.7 (14.8), BMI 25.8 (5.2), and radiographic follow-up time 8.9 (6.7) months. The Lapiplasty cohort had greater BMI (26.8 vs. 24.7, P = .048), and there were no significant differences between groups in age, sex distribution, and radiographic follow-up time. Radiographic measurement data is displayed in Table 1. After adjusting for age, sex, BMI, preoperative HVA, and preoperative IMA, fixation with Lapiplasty was significantly associated with lower postoperative IMA (b=-2.03, 95% CI = [-2.78, -1.37], P < .001) and lower postoperative HVA (b= -7.48; 95% CI = [-9.69, -5.26]; P < .001), but not postoperative sesamoid position. There were no significant differences between cohorts in the incidence of complications or reoperations. Conclusion: We found that use of the Lapiplasty system was associated with better radiographic hallux valgus correction, as evidenced by lower postoperative HVAs and IMAs, compared to standard technique with crossing screws. The clinical significance of these findings is unclear, as complication and reoperation rates were similar between groups. Future research assessing longer- term outcomes, patient-reported outcome data, and cost-benefit analysis will be necessary to further compare techniques and fixation systems.

Category: Ankle Arthritis; Ankle Introduction/Purpose: In the last decade, there has been a rapid increase in the number of total ankle arthroplasties (TAA) performed annually. In addition, multiple novel TAA implants have been introduced onto the market. The Exactech Vantage TAA is a fixed-bearing implant that has been in use since 2016. The tibial component is low-profile with vertically oriented pegs and a cage, while the talus is curved with an anterior flange to prevent subsidence. This study sought to describe the early experience with the Vantage TAA, including reoperation, revision, and radiographic outcomes. Methods: This is a single-center retrospective review of patients who underwent primary TAA using the Vantage Total Ankle (Exactech, Gainesville, FL). Concomitant procedures at the time of index surgery were recorded. Five surgeons contributed patients. Demographics, clinical and operative data, postoperative complications, reoperations, and revisions were collected. Revisions and reoperations were classified by standardized criteria. Radiographs were reviewed by a fellowship-trained foot and ankle surgeon to assess for alignment and peri-implant complications. There were 190 patients included in the study who were all minimum 2 years post-TAR, with mean clinical follow-up of 1.8 years (range: 1-48 months), and mean age 63.3 +- 9.4 years. Ankle arthritis etiologies were 45% post-traumatic (fracture history), 33% instability, 12% primary osteoarthritis, 5% flatfoot, 2% inflammatory arthritis, and 4% other. Thirteen patients (7%) had hindfoot fusion performed previously or at the time of index surgery. Concomitant procedures are shown in Table. Results: Overall implant survivorship was 95.3%. There were 5 intraoperative complications: 4 anterolateral tibial fractures and 1 medial malleolar fracture, all treated with internal fixation at the time of surgery with no further complications. Nine patients (4.8%) underwent revision: 7/9 for tibial loosening, 1 for talar loosening, and 1 for periprosthetic joint infection. Eleven patients (5.8%) underwent reoperation: open gutter debridement (5); irrigation and debridement for superficial infection (4); and bone grafting for cysts (2). Radiographically, preoperative coronal alignment was mean 10.1°, with 87 (49%) ankles with >10° deformity. Three patients had tibial component subsidence that was stable, 3 had stable radiolucency around the tibial component, and 1 had valgus failure through the ankle joint. Nineteen had asymptomatic peri-implant cysts; 16/19 were at the tibia. Conclusion: Short-term results of the Vantage TAA implant demonstrate survivorship of 95.3% at 2 years, which is comparable to similar studies of low-profile, non-stemmed implants. Asymptomatic radiographic complications were primarily cystic changes at the tibial component. Revisions occurred primarily due to loosening of the tibial component. Additional follow-up and multi- institutional support are warranted to further quantify survivorship and risk factors.

Category: Ankle Arthritis; Ankle Introduction/Purpose: Total ankle replacements (TAR) have rapidly advanced in terms of volume, technique, design, and indications. However, they are still at risk for failure and need for revision, even early in the postoperative period. Although recently there has been extensive research on TAR, many studies are limited in their power and sample size to assess risk factors for failure/revision. Using a large multi-surgeon retrospective database, we sought to describe the incidence and etiology of mechanical failure across modern implants. We also aimed to identify risk factors for early mechanical failure. We hypothesized that greater body mass index (BMI) and ipsilateral hindfoot fusion would be predictors of mechanical failure, and that implants with greater extent of tibial fixation (stems and keels) would be protective against mechanical failure. Methods: This is a single-center retrospective review of TAR patients in a prospective database. Adults undergoing primary TAR using any implant (Cadence, Inbone, Infinity, Invision, Salto, STAR, Vantage, Zimmer) who were minimum 2 years post-surgery were included. Exclusion criteria included revision TAR or patients undergoing ankle fusion takedown and conversion to TAR. Five surgeons contributed patients. Demographics, etiology of arthritis, operative data, and postoperative complications, reoperations, and revisions were collected. Revisions and reoperations were classified by standard criteria. Cause of revision was recorded. There were 560 TARs eligible for 2-year follow-up (mean 3.9 +- 1.1 years postoperative), with mean follow-up of 2.2 +- 1.4 years (range 1-71 months). The cohort had mean age 63.8 +- 9.1 years, BMI 29.4 +- 5.2 kg/m2, and 57% were male. Kaplan- Meier survival plots were created. Risk factors for revision due to mechanical failure were analyzed using multivariable logistic regression with partial Wald chi square statistics. Results: Most implants were low-profile (n=444, 79.3%), with 28 implants having tibial keels (5%) and 88 with tibial/talar stems (15.7%). There were 25 (4.5%) revisions of tibial and/or talar components at mean 1.6 years after index surgery (Figure). Preoperative coronal deformity did not impact revision rates (p=0.433). Patients who underwent revision for mechanical failure had significantly higher rates of concomitant hindfoot fusion (20% vs. 8.4%, p=0.047) and greater BMI (31.4 kg/m2 vs. 29.3 kg/m2, p=0.04). In multivariable logistic regression, hindfoot fusion was just short of statistical significance (odds ratio [OR] 2.96, p=0.056), and BMI was not significant (OR 1.05, p=0.417). Stemmed or keeled implants did not significantly decrease revision rates compared to low-profile implants, although the revision rate of stemmed implants was substantially low (1/88, 1.1%). Conclusion: Among 560 modern TAR implants, short-term survivorship was 95% at 2-year follow-up, which is consistent with existing studies. Patients who underwent revision for early mechanical failure had significantly higher BMI and rates of hindfoot arthrodesis. However, these variables fell short of statistical significance in multivariable regression, suggesting that there are either additional factors contributing to revision, or a larger cohort is needed. In addition, these results are likely biased by surgeons' tendencies to use stemmed implants in patients with hindfoot fusions. Further research is warranted to determine if stemmed implants provide a protective effect in these high-risk patients.

Category: Other; Ankle; Ankle Arthritis; Bunion; Hindfoot; Midfoot/Forefoot; Sports; Trauma Introduction/Purpose: Fulfilment of patients' expectations following foot and ankle surgery has been previously studied, and shown to be an effective modality in assessing patient-reported outcomes (PROs). While this assessment has been shown to correlate well with patient satisfaction and other validated PROs, the impact of postoperative complications on fulfilment of expectations is unknown. The aim of this study is to therefore investigate the impact of postoperative complications on fulfilment of patients' expectations. Methods: Preoperatively, patients completed a validated Foot and Ankle Expectations Survey consisting of 23 questions encompassing domains including pain, ambulation, daily function, exercise, and shoe wear. At 2 years postoperatively, patients answered how much improvement they received for each item cited preoperatively. A fulfilment proportion (FP) was calculated as the amount of improvement received versus the amount of improvement expected. Chart review was performed to identify patient demographics, comorbidities, pain management, and postoperative complications, which were classified as minor (infection requiring antibiotics) or major (return to OR for revision, deep infection). FP in patients with a complication was compared to patients who did not experience a complication. In addition, the Foot and Ankle Outcomes Score (FAOS), satisfaction, and Delighted-Terrible scale (how they would feel if asked to spend the rest of their life with their current foot/ankle symptom) were collected at final follow-up. Results: Of the 271 patients (mean age 55.4 years, 65% female), 31 (11.4%, mean age 53.6, 58% female) had a postoperative complication: 25 major (19 revisions, 6 deep infections requiring I&D), 4 minor (4 superficial infections requiring antibiotics), and 2 major and minor (revision and superficial infection). Average time from complication to completion of fulfilment survey was 15 (+- 3.6) months. The groups were similar in diagnoses. Complications were associated with significantly worse FP (0.69 +- 0.45 vs 0.86 +- 0.40, p=0.02). Having a complication significantly correlated with worse satisfaction, Delighted-Terrible scale, and FP (p

Category: Ankle Arthritis Introduction/Purpose: One of the proposed benefits of total ankle replacement, when compared to ankle fusion is the preservation of range of motion (ROM) of the ankle. Preservation of ankle motion may improve quality of life as evidenced by patient-reported outcome measures (PROMs). However, despite improving dorsiflexion intraoperatively during TAR, studies have not demonstrated large improvements in dorsiflexion (DF) at final followup after TAR. The objective of this study was to radiographically evaluate and quantify preoperative, intraoperative ankle dorsiflexion and plantarflexion (PF), compare it to post- operative ankle ROM, and determine the effect of Achilles lengthening (TAL) on preserving dorsiflexion motion that is gained during surgery. Methods: This prospective study compared 111 patients with an average age of 62.3 years who underwent primary total ankle replacement with one of four different implants between March and December 2019. A total of 71 patients (64%) had an associated TAL based on the surgeon's decision. Intraoperative fluoroscopy was utilized by the primary surgeon to document the maximal dorsiflexion and plantar flexion at the end of the case. This was completed after the TAL on a perfect lateral. Standardized weight bearing at maximum ROM positions lateral radiographs were obtained twelve months postoperatively. The change in range of motion was analyzed using a paired t-test with a significance level of 0.05. Results: The cohort's preoperative range was 22.0° (8.1°DF, 14°PF) and was increased to 38.5° intraoperatively (12.7°DF, 25.8°PF) as described in Table 1. Postoperative ROM is 24.9° (11.7°DF, 13.2°PF) which means that 65% of the intraoperative ROM is preserved. Preoperative and intraoperative range of motion was not different between the group that had a TAL compared to no TAL. At the year postoperatively, the dorsiflexion was similar between both groups. The group who did not have a TAL went from 12.8 intraoperatively to 12.2° postoperatively whereas the group who had a TAL went from 12.2° to 11.3° which was statistically equivalent. Conclusion: This study is the first to assess how much ankle range of motion is retained after TAR. Overall, we observed that 65% of dorsiflexion was retained after TAR. TAL as a concomitant procedure did not effect the proportion of dorsiflexion motion that was retained. Additional studies are needed to determine how to best optimize and increase ROM after TAR.

Category: Bunion; Midfoot/Forefoot Introduction/Purpose: Minimally invasive bunion surgery is relatively new in the United States, with the requisite burrs only approved for use by the FDA in 2017. Early reports on outcomes have been encouraging. However, no study to date has compared outcomes from the minimally invasive chevron and Akin procedures (MICA) to the modified Lapidus procedure. Our goal was to compare clinical and radiographic outcomes of MICA to those of the modified Lapidus procedure in patients with comparable deformities. We hypothesized that radiographic parameters of hallux valgus would be superior in the Lapidus group, but that there would be no significant difference in clinical outcomes or satisfaction between the two groups. Methods: Patients were retrospectively reviewed for inclusion from a prospectively-collected foot and ankle registry at our institution. Patients were eligible if they underwent either the MICA or modified Lapidus procedure, were 18 years or older, and had preoperative and minimum 5 month postoperative weightbearing radiographs. Exclusion criteria included prior forefoot surgery, additional surgeries (such as metatarsal shortening), and concomitant foot conditions (such as flatfoot deformity). Each surgery was performed by one of six fellowship-trained orthopedic foot and ankle surgeons. Demographics, PROMIS scores, and satisfaction data were collected from the registry. Complications and reoperations were collected from chart review. The hallux valgus angle (HVA), intermetatarsal angle (IMA), and tibial sesamoid position (SP) were measured pre- and postoperatively. Patients in the MICA group were matched to patients who underwent Lapidus bunionectomy based on radiographic parameters. Differences between the groups were assessed with paired t-tests for continuous variables and chi-square tests for categorical variables. Results: 41 patients who underwent MICA and 81 patients who underwent Lapidus bunionectomy met the inclusion criteria. Of the Lapidus patients, 41 were included, matched to the MICA patients. There were no significant differences in demographics or preoperative parameters between groups aside from sex (Table). Both groups achieved similar radiographic correction (Table). Bunion recurrence (HVA >=20°) occurred in one MICA patient and two Lapidus patients, with all patients asymptomatic. The most common reason for reoperation was removal of hardware (4 patients in the MICA group, 2 patients in the Lapidus group). One additional patient in the MICA group required reoperation for wound closure, and one additional patient in the Lapidus group required a derotational proximal phalanx osteotomy. Conclusion: This is the first study to our knowledge to compare outcomes between MICA and the modified Lapidus procedure in patients matched for bunion severity. We found that patients with similar preoperative deformities experience similar radiographic outcomes following MICA versus modified Lapidus bunionectomy. Our analysis of PROMIS scores and satisfaction data is currently underway. Although this is short-term data, it provides additional support for minimally invasive techniques which allow for faster, less painful recoveries. Further research is needed to investigate longer term outcomes and to establish which deformities are best suited to each procedure.

Category: Ankle Arthritis; Ankle Introduction/Purpose: The use of total ankle arthroplasty (TAA) in the treatment of ankle arthritis has grown substantially as advancements are made in design and surgical technique. Among the criteria guiding the choice between arthroplasty versus arthrodesis, the long-term survival and postoperative outcomes are of crucial importance. First FDA approved in 2005, the INBONE I prosthesis was subsequently replaced by the INBONE II in 2010. While outcomes of the INBONE I have been published, there is limited long-term survivorship data for the INBONE II. The purpose of this study is to determine the minimum 5-year survivorship of the INBONE II prosthesis and causes of failure. In addition, we evaluate long-term radiographic and patient- reported outcomes. Methods: We retrospectively identified 46 prospectively followed patients from 2010 to 2015 who underwent TAA with the INBONE II prosthesis at our institution. Of these, 44 cases (41 patients) had minimum follow-up of 5 years (mean, 6; range, 5 to 9). Mean age was 65.6 years (range, 42 to 81) and mean BMI was 27.6 (range 20.1 to 33). Survivorship was determined by incidence of revision, defined as removal/exchange of a metal component. Chart review was performed to record incidences of revision and reoperation. Preoperative, immediate and minimum 5-year x-rays were reviewed; coronal tibiotalar alignment (TTA) was measured on standing AP radiographs to assess alignment of the prosthesis. A TTA of +-5° from 90° indicated neutral alignment, while 95° was considered varus and valgus alignment, respectively. Radiographic subsidence as well as presence and location of periprosthetic cysts were documented. Pre- and minimum 5-year FAOS domains were compared. Results: Survivorship was 97.7% with one revision of the talar component due to aseptic loosening and subsidence. The rate of other reoperations was 4.5% (2); one patient underwent medializing calcaneal osteotomy for valgus heel alignment, another patient underwent ostectomy and debridement for ankle impingement. Average preoperative TTA was 88.5 degrees with 15 neutral (average TTA of 89.7°), 14 varus (74°) and 12 valgus (104°) ankles. Average postoperative TTA was 88.6° with 35 neutral (89.3°), 6 varus (84.7°), and no valgus ankles. Radiographic subsidence was observed in one patient who underwent revision, and periprosthetic cysts were observed in 7 patients. There was significant improvement in all FAOS domains at final follow-up. Conclusion: This is the largest study to date dedicated to evaluating survivorship of the INBONE II prosthesis. Our data suggests a high survival rate and low reoperation rate with long-term follow-up of the INBONE II implant. We observed significant improvement in radiographic alignment as well as patient-reported clinical outcomes at minimum 5-year follow-up.

Category: Ankle; Ankle Arthritis; Arthroscopy; Basic Sciences/Biologics; Bunion; Hindfoot; Lesser Toes; Midfoot/Forefoot; Sports; Trauma; Other Introduction/Purpose: Patients’ expectations - and whether they are met - are an integral component of orthopaedic foot and ankle surgery. An expectations survey has been developed and validated to quantify patients’ expectations preoperatively and the fulfillment of those expectations postoperatively. The fulfillment of expectations correlates highly with perceived improvement, outcomes scores, and overall satisfaction with surgery, both in foot and ankle surgery and across orthopaedic subspecialties. Yet unlike other orthopaedic specialties, foot and ankle contains an inherently wide variety of patient diagnoses and procedures. This study sought to identify the effect of foot and ankle diagnosis on postoperative outcomes in terms of the extent to which expectations are fulfilled. We hypothesized that the fulfillment of expectations would vary with diagnosis. Methods: This is a prospective single-center study of adult patients undergoing elective foot and ankle surgery. Preoperatively, all patients completed the validated Expectations Survey (range 0-100, with 100 indicating maximum expectations), which asks about anticipated improvement in items like pain, ambulation, function, and more generalized items like ‘going back to normal.’ Two years postoperatively, patients noted how much improvement (none, a little, moderate, a lot, or complete) actually attained for each item cited preoperatively. This allowed for calculation of a ‘Fulfillment Proportion (FP),’ a numerical representation of whether each patient’s expectations were unmet (FP=0), partially met (FP 0-1), met as expected (FP=1), or surpassed (FP>1). FP was compared across diagnoses, and bivariate analysis between diagnoses and expectation fulfillment was performed using ordinal regression. Multivariate ordinal regression was then used to analyze the effect of diagnosis, clinical variables, and preoperative expectations on expectation fulfillment. Results: 271 of 340 (80%) patients had both preoperative and 2-year postoperative expectations data. Mean age was 55.4 years, mean BMI was 27.5 kg/m2, and 65% were female. Patients with diagnoses of midfoot/hindfoot arthritis (FP 0.68 +- .46) and neuroma (FP 0.69 +- .89) had the lowest proportion of expectations fulfilled (Table). Conversely, ankle arthritis patients had the highest proportion of expectations fulfilled (FP 0.94 +- .41). In multivariate regression analysis, diagnosis and preoperative expectations scores were significant independent predictors of low expectation fulfillment. Despite having lower preoperative expectations, neuroma patients were 5 times more likely (95% CI 1.5-14.6, p=.008) and midfoot/hindfoot arthritis patients were 3 times more likely (95% CI 1.3-8.5, p= .013) to have unfulfilled expectations. Conclusion: In orthopaedic foot and ankle surgery, the fulfillment of expectations varies with preoperative diagnosis. Patients with diagnoses of midfoot/hindfoot arthritis and neuroma were significantly more likely to have lower proportions of expectations fulfilled. Although the exact causes are unknown, possible explanations include the need for subsequent procedures, continued need for orthotics, progression of arthritis to adjacent joints in midfoot/hindfoot arthritis patients, and recurrent or residual symptoms in neuroma patients. Preoperatively, surgeons should emphasize the risks of surgery as well as the importance of realistic expectations in these patients in order to optimize their outcomes postoperatively.

Category: Other Introduction/Purpose: In foot and ankle surgery, the fulfillment of patients’ preoperative expectations is a unique and validated method to assess postoperative success. Expectation fulfillment is closely associated with postoperative outcomes, satisfaction, and patient-reported improvement. Ideally, foot and ankle patients should have realistic expectations of surgery so that they are appropriately prepared for their postoperative symptoms and function. Inappropriately high expectations may predispose to worse outcomes because patients have unrealistic views about what their surgery can actually accomplish. Conversely, inappropriately low expectations may represent a lack of motivation to improve or participate in rehabilitation and postoperative protocols. This study aimed to identify the relationship between preoperative expectations and postoperative fulfillment. These results may facilitate surgeon-patient communication and help patients prepare for their operation and their postoperative function. Methods: Adult patients undergoing elective foot and ankle surgery at a single center were prospectively enrolled. Demographics, diagnosis, and outcomes surveys (Short Form [SF]-12, Foot & Ankle Outcome Score, improvement, satisfaction) were collected. Preoperatively, each patient completed the Expectations Survey (range 0-100, with 100 indicating maximum expectations), which asks about anticipated improvement in domains like pain, ambulation, function, and shoewear. Two years after surgery, for each expectation cited preoperatively, patients answered how much improvement they actually achieved. Using a ratio of the postoperative and preoperative scores, a Fulfillment Proportion (FP) was calculated, along with the minimal clinically important difference (MCID). This permitted identification of patients with unfulfilled, fulfilled, and surpassed expectations. Bivariate correlations, chi-square analyses, and multivariate regressions with 95% confidence intervals (CI) were performed to identify the relationship between preoperative expectations, clinical variables, and postoperative expectation fulfillment. Results: There were 271/340 (80%) patients with 2-year follow-up, with mean age 55.4 years and 65% female. Most common diagnoses were hallux valgus (25%), flatfoot (11%), hallux rigidus (11%), ankle arthritis (10%), and chronic tendon injury (9%). Expectation fulfillment differed significantly with extent of preoperative expectations (Figure). Patients with average/high expectations had higher rates of unfulfillment compared to patients with low preoperative expectations (40-41% vs. 22%). Rates of surpassed expectations were highest in patients with low preoperative expectations (23%) compared to average (12%) or high (0%) preoperative expectations (p

Category: Other Introduction/Purpose: Fulfillment of patients’ expectations following foot and ankle surgery has been previously studied and validated in assessing patient-reported outcomes (PROs). While this assessment has been shown to correlate well with patient satisfaction and PROs, the impact of postoperative complications on fulfillment of expectations is unknown. The aim of this study is to therefore investigate the impact of postoperative complications on fulfillment of patients’ expectations. Methods: Preoperatively, patients completed a validated Foot and Ankle expectations survey consisting of 23 questions encompassing domains including pain, ambulation, daily function, exercise, and shoe wear. At 2 years postoperatively, patients answered how much improvement they received for each item cited preoperatively. A fulfillment proportion (FP) was calculated as the amount of improvement received versus the amount of improvement expected. The FP ranges from 0 (no expectations fulfilled), between 0 and 1 (expectations partially fulfilled), 1 (expectations met), to greater than 1 (expectations surpassed). In addition, patient-reported outcomes (FAOS), satisfaction, and Delighted-Terrible scale (how they would feel if asked to spend the rest of their life with their current foot/ankle symptom) were collected at final follow-up. Chart review was performed to identify patient demographics, comorbidities, pain management, and postoperative complications, which were classified as minor (infection requiring antibiotics) or major (unplanned return to OR, reoperation, or revision). Results: Of the 271 patients (mean age 55.4 years, 65% female), 31 (11.4%, mean age 53.6, 58% female) had a postoperative complication; 27 major (17 revisions, 10 removal of hardware due to pain/infection) and 6 minor (6 superficial infections requiring antibiotics). Complications were associated with significantly worse FP (0.69 +- 0.45 vs 0.86 +- 0.40, p=0.02). Average time from complication to completion of fulfillment survey was 15 (+-3.6) months. Having a complication significantly correlated with worse satisfaction, Delighted-Terrible scale, and FP (p

Category: Ankle; Ankle Arthritis Introduction/Purpose: Total ankle arthroplasty is considered one of the most common treatments for end stage osteoarthritis of the ankle. This procedure results in significant long-term improvements in pain and function while preserving pre-operative range of motion. Patients also demonstrate improvements in patient reported outcome measures (PROMs) - a modality that quantifies patient’s subjective well-being. Understanding the time to maximal subjective medical improvement (MMI) following total ankle arthroplasty can help guide resource allocation and manage patient expectations. The purpose of this investigation is to establish when patients perceive MMI according to PROMs following total ankle arthroplasty. Methods: A systematic review was conducted on the PubMed database to identify studies on total ankle arthroplasty which reported consecutive PROMs for at least two years postoperatively. Pooled analysis was done at 3-months, 6-months, 12-months, and 24-months postoperatively. The minimal clinically important difference (MCID) was established by a distribution-based method, which is one-half of the standard deviation of outcome score change for a given instrument. Clinically significant improvement was determined between pairs of intervals that exceeded the MCID. Results: A total of 12 studies and 1514 patients met the inclusion criteria for this review. Clinically significant improvement was seen up to 6 months postoperatively in both the American Orthopaedic Foot & Ankle Society Ankle-Hindfoot Score (AOFAS) and Visual Analog Scale (VAS) scoring systems but was not demonstrated at later intervals. The Short Musculoskeletal Function Assessment (SMFA) Function and Bother subsections were scored individually and both demonstrated clinically significant improvement until 1 year postoperatively. Conclusion: After total ankle arthroplasty, the maximal subjective medical improvement based on PROMs is seen until one year postoperatively, with clinically insignificant improvement beyond one year. The SMFA scoring system may offer greater sensitivity to subjective improvements compared to the AOFAS or VAS scales. This trajectory may help guide patients in managing their expectations in their functional outcomes during preoperative patient education.

Category: Midfoot/Forefoot; Other Introduction/Purpose: Severe adult-acquired flatfoot deformity (AAFD) is often associated with painful medial column collapse at the naviculocuneiform (NC) joint. The purpose of this study was to examine the role of first tarsometatarsal (1st TMT) fusion combined with subtalar fusion in correcting deformity at this joint. Methods: We retrospectively analyzed 40 patients (41 feet) who underwent 1st TMT and subtalar (ST) fusion as part of a flatfoot reconstructive procedure. We assessed six radiographic parameters both preoperatively and at a minimum of 6 months postoperatively, including talonavicular (TN) coverage angle, lateral talo-first metatarsal angle, lateral talocalcaneal angle, calcaneal pitch, hindfoot moment arm, and a newly defined navicular-cuneiform incongruency angle (NCIA). Patient-Reported Outcomes Measurement Information System (PROMIS) clinical outcomes were assessed preoperatively and at a minimum 1 year follow-up. Results: The NCIA demonstrated excellent interobserver reliability, with no significant change between pre- and postoperative measurements. All other radiographic parameters, except calcaneal pitch, demonstrated statistically significant improvement postoperatively (p

Category: Other Introduction/Purpose: Cases of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) virus (COVID-19) first emerged in Wuhan, China, in December 2019. Since then, the virus has spread globally at a rapid pace. The first case in New York City was reported on March 1, 2020, and the World Health Organization (WHO) declared a pandemic on March 11, 2020. New York City rapidly became the epicenter of the pandemic, with hospitals across the city making a number of changes to accommodate the influx of COVID-19 patients. Here, we describe our experience in adapting to the COVID-19 pandemic as a department consisting of 10 foot and ankle fellowship-trained surgeons with up to 28 years of individual experience in an academic orthopedic hospital. Methods: Information was obtained from direct interviews with surgeons in the Foot and Ankle Service and from our institution’s intranet. Additional information was obtained by viewing twice-weekly livestreams from March 27th, 2020 to May 1st, 2020 held by the Surgeon-In-Chief, which detailed hospital-wide policies and initiatives being implemented in the wake of the COVID-19 pandemic. Results: On March 17, 2020, all elective surgeries were suspended at our institution, and a list of essential procedures was established. In-person clinical visits were limited to new patients being evaluated for essential procedures and first postoperative visits for returning patients, with all patients receiving pre-visit and on-site screening for COVID-19. All other new patient and follow-up appointments were conducted via telehealth visits. Much of our main hospital was repurposed to accept transfers of both COVID-negative and COVID-positive patients. A postanesthesia care unit and a floor of 9 operating rooms were repurposed as negative-pressure rooms for the care of critical COVID-positive patients on ventilators. An Orthopedic Triage Center (OTC) was established to relieve the patient load in the emergency departments of other hospitals in the city. Conclusion: By changing the way we delivered foot and ankle care and repurposing the roles of our employees and our institution, we have adapted strategies to continue delivering care to our patients. As we transition toward a ‘new normal,’ our goals are to gradually progress toward normal operations while keeping our patients and employees safe. With these gradual steps, we hope to emerge from this pandemic stronger and ready to adapt to the ever-changing needs of our community.

Category: Other Introduction/Purpose: Aligning patient and surgeon expectations is important, as it allows for informed and shared decision- making and may improve postoperative satisfaction. Patient-provider communication factors have been found to affect differences between patient and surgeon expectations of total knee arthroplasty. Patients with limited health literacy have been found to ask fewer questions and spend less time with their surgeons, and to perceive themselves to have a more passive decision-making role in hand surgery clinic visits. Understanding how these factors affect differences in expectations of foot and ankle surgery is important in order to increase patient-surgeon agreement. This study aimed to assess associations between patient-reported physical and mental status, patient-surgeon communication factors, and musculoskeletal health literacy with differences between patient and surgeon expectations of foot and ankle surgery. Methods: Two hundred two patients scheduled to undergo foot or ankle surgery by one of seven fellowship-trained foot and ankle surgeons at an academic hospital were enrolled. Preoperatively, patients and surgeons completed the Hospital for Special Surgery Foot & Ankle Surgery Expectations Survey independently. Patients also completed Patient-Reported Outcomes Measurement Information System (PROMIS) scores in Physical Function, Pain Interference, Pain Intensity, Depression, and Global Health. Patient involvement in care, provider partnership building, and provider information giving were assessed with the modified Patients’ Perceived Involvement in Care Scale (PICS). Musculoskeletal health literacy was assessed with the Literacy in Musculoskeletal Problems (LiMP) questionnaire. A score >= 6 reflects adequate musculoskeletal literacy and a score < 6 reflects limited musculoskeletal literacy. Associations between scores and differences between patient and surgeon expectations were assessed with Pearson Correlation coefficients. Associations between musculoskeletal health literacy and differences were assessed with Student’s t-tests and Mann Whitney U tests. Results: Greater differences in patient and surgeon overall expectations scores were associated with worse PROMIS scores in Physical Function (p = 0.003), Pain Interference (p = 0.001), Pain Intensity (p = 0.009), Global Physical Health (p < 0.001), and Depression (p = 0.009). A greater difference in the number of expectations between patients and surgeons was associated with all of the above (p = 0.155). Conclusion: Worse baseline patient physical and mental status and higher patient perceptions of provider partnership building were associated with greater patient to surgeon differences in expectations of foot and ankle surgery. It may be beneficial for surgeons to set more realistic expectations with patients who have greater disability and in those whom they have stronger partnerships with in order to increase agreement in expectations. Further studies are warranted to understand how modifications in patient and surgeon interactions affect agreement in their expectations of foot and ankle surgery, and whether musculoskeletal literacy affects these interactions.

Background: Hallux rigidus (HR) is a common pathology of the first metatarsophalangeal (MTP) joint causing pain and stiffness. However, severity of symptoms and radiographic findings are not always concordant. A novel flexibility device, which measures the mobility of the MTP joint through its arc of motion, has been validated. This study compares flexibility in patients before and after cheilectomy (with or without proximal phalanx osteotomy) for HR. Methods: This is a single-center study of adult patients with HR who were indicated for cheilectomy or cheilectomy and Moberg (dorsiflexion closing wedge) osteotomy of the proximal phalanx based on symptoms and radiographs from 2013 to 2015. Pre- and postoperatively, patients underwent testing with a validated flexibility protocol to generate flexibility curves. Parameters included early and late flexibility, laxity torque, and laxity angle. Patients completed Foot and Ankle Outcomes Scores (FAOS) pre- and postoperatively. Twelve operative patients underwent preoperative testing, with 9 completing postoperative testing (mean age, 53.0 years; 67% female; mean 2.8-year follow-up). Results: Patients had significant improvements in early sitting and standing flexibility, sitting and standing laxity angles, standing laxity torque, and both sitting and standing maximum dorsiflexion after surgery (all P < .05). While preoperative early flexibility, laxity angle, and maximum dorsiflexion all differed significantly between patients and controls ( P < .015), postoperative early flexibility was similar to controls ( P > .279). FAOS scores for pain, symptoms, sport, and quality improved significantly after surgery. Conclusion: Surgical treatment with cheilectomy was associated with significant improvements in nearly all flexibility parameters for sitting and standing positions. However, most postoperative flexibility parameters did not improve to the level of normal controls. Regardless, patients still experienced significant improvements in outcomes. This study demonstrated that surgical correction is associated with significant biomechanical and clinical results. The flexibility device can be used in further studies to assess outcomes after other HR procedures. Level of Evidence: Level II, prospective comparative study.

Category: Ankle, Ankle Arthritis, Bunion, Hindfoot, Lesser Toes, Midfoot/Forefoot, Sports, General foot/ankle elective procedures, outcomes Introduction/Purpose: The setting and fulfillment of expectations represent a unique aspect of patient-reported outcomes that is closely associated with satisfaction. Within foot and ankle surgery, patients may expect improvement in pain, mobility, shoe wear, and function in daily life, whether in basic activities or exercise/sports. Within foot and ankle surgery, a 23-item expectation survey has been developed based on patient responses and validated in patients undergoing elective surgery. However, to date, postoperative fulfillment of expectations has not been reported. This study aimed to describe overall rates of expectation fulfillment as well as fulfillment among specific domains. We hypothesized that patients would have the most improvement in pain and ambulation items, with greater rates of unfilled expectations for generalized items like improving confidence and returning to normal. Methods: This is a single-center study of adult patients undergoing elective foot/ankle surgery with 2-year follow-up. Demographic and clinical data were collected along with pre/postoperative Foot and Ankle Outcomes (FAOS) scores. Preoperatively, patients completed the expectations survey, citing the amount of improvement anticipated for each item using Likert-style responses. At 2 years postoperatively, patients repeated the survey, responding with the amount of improvement actually achieved. The total scores for the preoperative and postoperative surveys were used to create a ratio representing the proportion of expectations fulfilled (1: expectations surpassed), which was analyzed with descriptive statistics. Responses for each item (pre/postoperatively) were also assessed. Responses of “moderate,” ”a lot,” or “complete” were considered fulfilled, while ”little” or “no” indicated not fulfilled. FAOS scores were compared from baseline to follow-up using paired t-tests. Results: There were 271 patients (mean age 55.4, BMI 27.5, 65% female). Most common diagnoses were hallux valgus (25%), flatfoot (11%), hallux rigidus (11%), ankle arthritis (10%), and chronic tendon injury (9%). Patients had significant improvement in all FAOS domains (P

Category: Ankle, Ankle Arthritis, Arthroscopy, Bunion, Hindfoot, Midfoot/Forefoot, Sports, Trauma Introduction/Purpose: Depression and anxiety are increasingly recognized to have a dramatic impact on patients with musculoskeletal pathologies. They complicate treatment due to complex relationships between pain, function, and affective symptoms. Depression/anxiety can cause social isolation, attention towards painful symptoms, and avoidance of physical exertion, all which may affect patient outcomes in orthopaedic surgery. Prior work has demonstrated that patients with depression/anxiety have greater preoperative expectations of foot/ankle surgery. However, no study to date has investigated the effect depression/anxiety on fulfillment of expectations and patient satisfaction postoperatively. We hypothesized that patients with preoperative depression or anxiety symptoms would have lower rates of expectation fulfillment than patients without affective disorders, particularly for expectations of pain relief and going back to normal. Methods: Patients undergoing elective foot/ankle surgery at a single center were prospectively enrolled. Demographics, diagnoses, and preoperative Foot and Ankle Outcomes Scores (FAOS) were collected. Preoperatively, patients completed an expectations survey, which asks about anticipated improvement in items including pain control, ambulation, function, and more generalized items like going back to normal and preventing foot/ankle pathology from worsening. Depression and anxiety were assessed using the Patient Health Questionnaire (PHQ-8) and Generalized Anxiety Disorder screener (GAD-7) respectively; for both surveys, scores of 10 or more were used to designate depression and anxiety. Patients repeated the expectations survey 2 years postoperatively, answering how much improvement was actually attained for each item. Patients also reported satisfaction with surgery, perception of overall improvement, extent to which expectations were fulfilled, and answered the Delighted- Terrible scale. Survey responses were compared between patients with depression and/or anxiety (D/A) and no D/A patients using t-tests and Chi-square analyses (p0.225). D/A patients had significantly less expectation fulfillment for ambulation tolerance (77% vs 90%, p=0.017), improving confidence in foot/ankle (77% vs 88%, p=0.049), and going back to normal (76% vs 87%, p=0.043). D/A patients were significantly more dissatisfied (21% vs 9%, p=0.013), had less perceived improvement, and were less likely to want to repeat surgery (p=0.019) or recommend surgery to someone else (p=0.017). Conclusion: D/A patients had significantly lower postoperative rates of overall perceived improvement and satisfaction with surgery compared to patients without affective symptoms. A majority of D/A patients did not meet their expectations for ambulation tolerance, confidence, and returning to normal. However, despite having worse baseline outcomes scores and more preoperative expectations, patients with depression/anxiety had similar improvements in FAOS and proportions of expectations fulfilled postoperatively. Therefore, despite perceived poor outcomes, D/A patients have similar improvements in outcomes and expectation fulfillment. These findings may improve surgeon/patient communication and management of expectations.

Category: Ankle, Basic Sciences/Biologics Introduction/Purpose: Subchondroplasty® (SCP®) (Zimmer Holdings, Inc, Warsaw, IN) is a relatively new procedure that was developed in 2007 for the treatment of bone-marrow lesions (BMLs). It involves the injection of flowable nanocrystalline calcium phosphate (CaP) synthetic bone substitute into the BML using fluoroscopic-guidance, in order to promote healing and reinforce the effected region. Although a newer technique, SCP has been shown promising results in the knee through several different small case-series. The foot and ankle literature is sparser, with only a few documented case-reports or case-series. As a result, we wanted to report our small case-series of patients who underwent talar SCP and went on to develop avascular necrosis (AVN). Methods: A retrospective review was conducted of patients who underwent SCP for a talar BML at our facility or were referred to our facility after undergoing SCP at an outside institution. Patients who developed iatrogenic talar AVN postoperatively were included in the study. Patient characteristics, comorbidities, imaging, and need for further surgery was analyzed. Results: Four patients were identified who had previously undergone talar SCP and went on to develop iatrogenic talar AVN. Two patients had their original SCP performed at our facility, whereas the other two patients were referred from outside institutions. All four patients were symptomatic from their AVN. Two patients have undergone revision surgical intervention, while the other two patients are pending surgical intervention. Conclusion: This case-series is the first study, to our knowledge, to report iatrogenic talar AVN after undergoing SCP for talar BMLs. Although early studies in the Foot and Ankle literature are promising for use of this technology, these studies have been small and surgeons should be aware of this potential complication.

Category: Ankle, Ankle Arthritis, Arthroscopy, Bunion, Hindfoot, Lesser Toes, Midfoot/Forefoot, Sports, General Foot/Ankle, Outcomes, Satisfaction Introduction/Purpose: Success in orthopaedic surgery was traditionally defined by postoperative radiographs or legacy outcomes scores, but increasingly incorporates more patient-centered metrics. Patient expectations are one such measure, and have been described using a new validated survey for foot/ankle patients. Understanding patients’ expectations of surgery is critical in order to facilitate shared decision-making and set reasonable goals for outcomes. In other specialties, postoperative expectations surveys have also been created and shown to correlate with measures of satisfaction and traditional patient-reported outcomes scores. However, there are no such studies in the foot and ankle literature. This study aimed to validate a method of assessing expectation fulfillment in foot/ankle patients postoperatively. We hypothesized that the survey would significantly correlate with measures of improvement, satisfaction, and clinical outcomes scores. Methods: This is a single-center prospective study of patients undergoing elective foot and ankle procedures. Preoperative demographics, clinical data, and Foot & Ankle Outcomes Score (FAOS) were collected. Patients completed the expectations survey, consisting of 23 questions for domains including pain, ambulation, daily functioning, exercise/sports, shoe wear, and generalized items like “improving confidence in foot/ankle” and ”going back to normal.” Postoperatively, patients answered how much improvement they received for each item listed on the preoperative survey. Using previously validated methods, the proportion of expectations fulfilled was calculated as a ratio of the preoperative to postoperative expectations score, with values of 0 -1 indicating some expectations met, 1 indicating expectations met; and >1 indicating expectations surpassed. Receiver operator characteristic (ROC) curves and areas under the curve (AUC) with 95% confidence intervals (CI) were used to compare the expectations survey to other outcomes scales, including FAOS, perceived improvement, overall fulfillment, Delighted-Terrible scale, and satisfaction. Results: 271/340 (80%) of patients with preoperative data completed 2-year follow-up (mean age 55.4 years, mean BMI 27.5, 65% female). Most common diagnoses were hallux valgus (25%), flatfoot (11%), hallux rigidus (11%), and ankle arthritis (10%). Mean proportion of expectations fulfilled was 1.15, indicating surpassed expectations. The proportion of expectations fulfilled correlated best with perceived improvement, global expectation fulfillment, and the Delighted-Terrible scale, and to a lesser degree with satisfaction and change in FAOS (all except activity). Based on the inflection point of the ROC curves corresponding to greatest AUC (Table), a clinically important proportion of expectations fulfilled was 0.81 and correlated with feeling delighted (sensitivity 0.88, specificity 0.85), improvement (sensitivity 0.89, specificity 0.83), overall expectations (sensitivity 0.91, specificity 0.81), and satisfaction (sensitivity 0.85, specificity 0.81). Conclusion: The proportion of expectations fulfilled is a valid outcome tool for foot and ankle surgery. It is uniquely able to capture pre- and postoperative data in one value and can be tailored to each patient’s specific goals. This survey can be used by surgeons after a variety of procedures to assess if a patient’s specific expectations have been fulfilled after surgery. We can use this tool to assess which patient and surgical factors may influence the fulfillment of expectations. This, in turn, will help surgeons better indicate the appropriate procedure in the optimal patient to achieve the greatest postoperative success.

Category: Ankle Arthritis Introduction/Purpose: Determining the etiology of pain after total ankle replacement (TAR) often serves as a diagnostic dilemma for many surgeons, particularly in the setting of normal appearing radiographs. Single photon emission computed tomography (SPECT CT) has been identified as a potentially useful tool to evaluate pain after TAR. However, prior research has been limited by a lack of comparison to clinical findings as well as comparison to other imaging modalities. Our study aims to add to the current understanding of the role of SPECT CT as a diagnostic tool in TAR. It is our hypothesis that SPECT CT would be predictive of clinical and intraoperative findings in patients with pain after TAR. Methods: A retrospective review was undertaken of SPECT CT imaging performed at our institution for the evaluation of painful TAR from January 2014 to November 2018. There were 35 patients identified during this time period who underwent SPECT CT to evaluate pain after TAR. The average length of time from index surgery to SPECT CT was 17.2 months. Of this cohort, 18 patients also had an MRI during the same time frame and images were available for comparison. Findings on the imaging studies were compared to clinical findings as documented in the medical record, as well as intraoperative findings at the time of revision surgery when one was performed. SPECT CT results, as well as MRI results when available, were evaluated for their consistency with documented clinical and intraoperative findings. Results: Of the 35 patients, 91.4% (32/35) had SPECT CT results that were consistent with clinical findings. Amongst the diagnoses for which SPECT CT was useful in this cohort, loosening (12/32) and impingement (10/32) were most common. Other diagnoses included malalignment (4/32), cyst formation (2/32), subtalar arthritis (2/32), and infection (2/32). In our cohort, 25 patients underwent revision surgery, and SPECT CT imaging was consistent with ultimate intraoperative findings in 24 (96.0%) cases. Procedures performed were revision for aseptic loosening (11/25), gutter debridement (5/25), revision for malalignment (2/25), hindfoot reconstruction (2/25), implant removal for infection (2/25), cyst grafting, subtalar arthrodesis, and conversion to ankle arthrodesis. In the 18 patients who also underwent MRI, these results were consistent with clinical findings 38.9% (7/18) of the time. Conclusion: In this cohort, there was a high consistency between SPECT CT results and documented clinical diagnoses. Additionally, in those patients who ultimately underwent revision surgery, SPECT CT demonstrated high consistency with intraoperative findings. When compared to MRI, SPECT CT proved more useful in helping to establish a diagnosis for pain after TAR in our cohort. Our series serves to highlight the utility of SPECT CT as an additional tool in evaluating the painful TAR. Further investigation into the interpretation of SPECT CT after TAR, including changes in physiologic postoperative uptake that occur over time, is warranted.

Category: Ankle Arthritis Introduction/Purpose: The Scandinavian Total Ankle Replacement(STAR) system and Salto Talaris(ST) total ankle system are two of the more commonly studied total ankle implants. As the STAR is one of the oldest total ankle arthroplasty (TAA) implants still in use today, most studies focus on longevity and survivorship. Reported rates of cyst formation for these two prosthesis in most series vary from 11-22% but no large study has focused on surgical management of these cysts or included patient reported outcomes after surgery. In this series, we aimed to investigate rates of cyst formation between mobile(MB) and fixed-bearing(FB) TAA and examine clinical and patient reported outcomes of bone grafting or cementing of large cysts surrounding the STAR and ST implants. Methods: A prospectively collected database at a high volume total ankle replacement center was retrospectively reviewed to identify patients who underwent TAA with either the STAR or the ST total ankle system between 2007 and 2015. Cysts were identified and measured on standard weight bearing radiographs and confirmed on computed tomography(CT) when available. Visual analog scale (VAS) score, Short Form-36 (SF-36) physical and mental component scores, Short Musculoskeletal Function Assessment(SMFA), and AOFAS hindfoot scores were collected from all patients preoperatively and then at 6 months, 1 year and annually postoperatively. Patients with a minimum 2 years follow-up who underwent revision TAA secondary to catastrophic bone cysts or who were managed with either curettage and bone grafting or curettage and cementing of bone cysts surrounding the TAA prosthesis were included in the patient reported outcomes (PRO) analysis Results: Excluding 53 patients for inadequate follow-up, 232 patients (29% female, 71% male; follow-up 6.7 years) who underwent STAR-TAA and 147 patients (26.6% female, 73.5% male; follow-up 7 years) who underwent ST-TAA were identified. Cysts 10 mm were identified in 95/232 (41%) STAR and 24/147 (16%) ST ankles. In the STAR group, 24 patients underwent cyst bone grafting (13), cementing (6) or both (8) at a mean 4.8 years. In the ST group, 14 patients underwent cyst bone grafting (6), cementing (4), or both (4) at a mean of 2.7 years. PRO data improved significantly for both the STAR and ST group in all questionnaires (p10mm 95(41%) 24 (16%) Patients Requiring Cyst Surgery 24/95 (25%) 14/24 (58%) Age (years) 61.8 63.3 Sex Male 165(71%) 107(73%) Female 67(29%) 40(27%) Time Until Cysts Visible (years) 1.82 1.63 Cysts 20mm Diameter Tibia 28 patients 4 patients Talus 4 patients 2 patients Both 0 Patients 2 patients Reoperation for Cyst n=24 n=14 Management mean 4.8 years post-op mean 2.7 years post-op Bone Grafting 13 6 Cementing 6 4 Both 8 4 SF-36 Before Cyst Surgery Physical Function 23.8 19.9 Mental Health 75.1 77.9 SF-36 After Cyst Surgery Physical Function 68.3 67.6 Mental Health 89.4 88.8 VAS Before Cyst Surgery 62.7 59.4 VAS After Cyst Surgery 4.1 3.7

Category: Ankle Arthritis Introduction/Purpose: Total ankle arthroplasty (TAA) for ankle arthritis leads to a more normal gait pattern compared to ankle arthrodesis, prompting many to hypothesize that TAA slows development of adjacent joint arthrosis. However, following TAA, patients may also develop hindfoot pain, deformity and dysfunction, ultimately requiring arthrodesis procedures. Many patients with AA also have subtalar and/or talonavicular arthrosis. In these cases, simultaneous TAA and hindfoot arthrodesis may be performed. Previous studies have found that TAA in conjunction with hindfoot arthrodesis procedures led to inferior outcomes compared to isolated TAA. The purpose of this analysis was to compare the functional outcomes of simultaneous vs. subsequent hindfoot arthrodesis procedures and to describe the change, if any, in outcome scores following a subsequent hindfoot arthrodesis procedure. Methods: After receiving Institutional Review Board approval, the TAA database at our institution was reviewed for all TAA performed between 1998 and 2015. All patients who received a TAA and either a simultaneous or subsequent hindfoot arthrodesis with at least two years of clinical follow up were included in the analysis. All surgeries were performed by one of three fellowship-trained orthopaedic foot and ankle surgeons with extensive experience in TAA and associated hindfoot arthrodesis procedures. Outcome measures included preoperative and 2-year postoperative visual analog scale (VAS) scores, Short Musculoskeletal Function Assessment (SMFA), Short Form (SF)-36 and American Orthopaedic Foot and Ankle Society (AOFAS) Ankle-Hindfoot scores. Results: 64 patients met the inclusion criteria. 39 patients underwent TAA with simultaneous hindfoot arthrodesis (Sim) and 25 underwent a subsequent arthrodesis procedure (Sub) an average 22.2 months following TAA. 20 patients underwent double arthrodesis (11 Sub) and 44 patients underwent subtalar fusion (14 Sub). There were no differences in preoperative questionnaire scores between the two groups. Both the Sim and Sub groups experienced significant improvement in their postoperative VAS, SMFA, SF-36 and AOFAS scores. Postoperative VAS and SMFA bother scores were significantly lower for the Sim group (p

Category: Ankle Arthritis Introduction/Purpose: Modern total ankle arthroplasties (TAAs) have demonstrated improved survival rates at early- and mid-term follow-up, with revision rates ranging from 4 to 8% at five years. The INFINITY total ankle system (Wright Medical Technology, Arlington, TN) was first used in the United States in 2014. Its advantages include the ability to use patient-specific instrumentation and the option to choose between talar dome resurfacing and flat-cut talar components. While this implant is currently popular in the United States, clinical outcomes have not yet been reported. Our aim was to identify the rate of early revision among patients receiving the INFINITY prosthesis. Methods: Patients from two prospectively-collected databases at the authors’ institution were screened for inclusion in the present study. All patients who underwent a primary TAA with the INFINITY prosthesis and who were at least one year postoperative were included. All surgeries were performed by one of two orthopaedic foot and ankle surgeons with extensive experience in total ankle arthroplasty. The primary outcome was the need for revision surgery, which was defined as removal of one or both metal components. Peri-implant lucency at most recent follow-up was a secondary outcome. Anteroposterior and lateral radiographs at most recent follow-up were graded for lucency independently by two reviewers, both orthopaedic foot and ankle fellows, for individual peri-implant zones (Figure). Each zone was only considered “lucent” if recorded as such by both reviewers. Results: 160 patients underwent TAA with the INFINITY prosthesis between August 2014 and November 2016 with a mean 20 months of follow-up (range, 12-37). Six patients were lost to follow-up. Sixteen patients (10%) underwent revision a mean 1.2 years postoperatively. Revision was performed most commonly for tibial component loosening (seven patients, 4.4%) and deep infection (five patients, 3.1%). Of cases with tibial loosening, progressive lucency and/or subsidence was obvious radiographically in four patients; one patient had equivocal radiographs but loosening was suggested on single-photon emission computed tomography; and two patients revised for persistent pain had loosening confirmed intraoperatively. Of the 108 patients with retained components and at least one year of radiographic follow-up, eight (7.4%) had global lucency around the tibial component at most recent follow-up. Conclusion: Our initial review of patients undergoing TAA with the INFINITY prosthesis demonstrates an elevated early revision rate due to tibial component loosening. The reasons for this finding remain unclear, but could possibly include inadequate bony purchase of the implant’s three prongs, particularly in patients with large preoperative deformities or with imperfect component alignment. We plan to further investigate the possible reasons for this finding in the future by assessing additional patient factors, including age, sex, arthritis type, tobacco use, pre- and postoperative coronal and sagittal alignment, and presence of ipsilateral hindfoot fusion.

Category: Ankle Arthritis Introduction/Purpose: Bone density is a modifiable factor which can be addressed prior to elective surgery if necessary. However, its role pertaining to complications of total ankle arthroplasty (TAA) has not been studied. Hounsfield units (HU) can be measured on standard computed tomography (CT) imaging, and have been shown to correlate with bone mineral density measures from dual-energy X-ray absorptiometry (DEXA). There is a precedent for these measurements in the orthopedic literature: different authors have shown that patients with higher vertebral bone density on CT are at lower risk for pedicle screw loosening. We hypothesized that patients with lower bone density, as measured by HU on preoperative CT, or with large preoperative cysts, would be at greater risk for revision and periprosthetic fractures following TAA. Methods: An existing database at the authors’ institution was used to screen all patients who underwent primary TAA. Inclusion criteria included a CT scan within one year prior to surgery. Exclusion criteria included tibial or talar hardware and nonweightbearing status at the time of the CT scan. The primary outcomes were prosthetic revision and periprosthetic fracture. HU were measured on axial CT cuts at 10 mm above the tibial plafond and at 5 mm below the talar dome to approximate the location of bone cuts. HU measurements for 30 patients were made independently by two reviewers in order to establish interrater reliability. Subchondral cysts at least 5 mm in diameter were counted. Additional patient factors analyzed included age, sex, weight, body mass index (BMI), tobacco use, presence of rheumatoid arthritis, preoperative deformity =15°, and pain visual analog scale scores. Results: 198 patients with a mean 2.4 years of follow-up met the inclusion criteria. The intraclass correlation coefficients for tibial and talar HU measurements were both 0.95. Seven patients (3.5%) underwent revision, four for infection, at a mean 1.2 years postoperatively. There were seven intraoperative and nine postoperative periprosthetic fractures (3.5% and 4.5%, respectively). Neither bone density nor cysts were associated with revision (p>.05). Lower tibial and talar HU, lower weight, and lower BMI were all associated with periprosthetic fracture (Table). After controlling for age, sex, and weight, only tibial HU was significantly associated with periprosthetic fractures (p=0.018). All intraoperative fractures occurred in patients with tibial HU

Category: Ankle Arthritis Introduction/Purpose: Among patients with end-stage ankle arthritis, total ankle arthroplasty (TAA) utilization has significantly increased in recent years, while ankle arthrodesis utilization has declined. Significant coronal plane deformity is frequently encountered in this patient population, and was previously considered a contraindication to TAA. However, the advent of newer fixed-bearing prostheses, coupled with improved surgical techniques and a better understanding of ligamentous balancing, have allowed surgeons to extend their indications for TAA with respect to deformity correction. Several authors have demonstrated good outcomes from TAA in patients with significant varus deformities, but not specifically in patients with valgus deformities. We aimed to determine the clinical, radiographic, and patient-reported outcomes of patients with moderate to severe valgus deformity who underwent TAA for end-stage ankle arthritis. Methods: Eighty patients with valgus deformities =10 degrees who underwent TAA were retrospectively reviewed. All surgeries were performed by one of three fellowship-trained orthopaedic foot and ankle surgeons with extensive experience in TAA. One of three prostheses were used: INBONE (Wright Medical Technology, Arlington, TN), Salto-Talaris (Integra, Plainsboro, NJ), or the Scandinavian Total Ankle Replacement (STAR; Stryker, Kalamazoo, MI). We assessed the coronal tibiotalar angle on standardized weightbearing radiographs preoperatively, at one year, and at final follow-up. The visual analog scale (VAS) for pain, Short Form (SF)-36 scale, American Orthopaedic Foot and Ankle Society (AOFAS) hindfoot-ankle scale, and Short Musculoskeletal Function Assessment (SMFA) scores were assessed preoperatively and at final follow-up. Subgroup analyses were performed to determine differences in outcome scores, deformity correction, and maintenance of alignment between patients with moderate (=10 degrees, 20 degrees) preoperative deformity. Complication, reoperation, and revision rates were collected from chart review. Results: Mean preoperative valgus deformity was 15.5 ± 5.0 degrees, and was corrected to a mean 1.2 ± 2.6 degrees of valgus postoperatively (Figure; P

Category: Midfoot/Forefoot Introduction/Purpose: Range of motion measurements of the first metatarsophalangeal joint (MTPJ) are an essential component in assessing and classifying hallux rigidus (HR). However, they provide little information about joint function and are limited by variability in technique. As an alternative, measuring joint flexibility can characterize intrinsic properties of the joint—aside from simply maximum dorsiflexion and plantarflexion—that may prove more clinically meaningful. No prior study has assessed hallux MTPJ flexibility in patients with HR. The purpose of this study was therefore to assess the reliability of a custom flexibility device and to compare flexibility between HR patients and controls. Methods: Fifteen patients with Coughlin stage II or III HR indicated for cheilectomy and 20 healthy controls were recruited prospectively. Each of two raters performed a series of seated and standing tests on each subject with the device. Dorsiflexion angle and applied torque were plotted against each other to generate a flexibility curve. “Early flexibility” and “late flexibility” were defined as the slope of the curve in the first 25% and last 25% of motion, respectively. From these two parameters, three additional parameters were calculated: laxity angle, laxity torque, and torque angle (Figure). Differences between (1) HR patients and controls and (2) sitting and standing testing positions were assessed with t-tests. Intra-rater test-retest reliability, remove- replace reliability, and inter-rater reliability were assessed with intraclass correlation coefficients (ICCs). Results: Patients in the HR group were older than patients in the control group (p < 0.001) and had significantly lower maximum dorsiflexion (p < 0.001). HR patients were less flexible as measured by three of the five flexibility parameters: early flexibility (p = 0.027), laxity angle (p < 0.001), and torque angle (p = 0.002). After controlling for age on seated measurements, only laxity angle and maximum dorsiflexion differed significantly between HR patients and controls (p < 0.001). Generally, patients were more flexible in the seated position than in the standing position, with this effect being more marked in HR patients. All parameters had good or excellent intra- and inter-rater reliability (ICC = 0.60). Conclusion: This is the first study to demonstrate a reliable method of measuring first MTPJ flexibility in patients with HR. We found that flexibility, even early in the arc of motion, is impaired in patients with HR. Moreover, significant differences between sitting and standing measurements suggest that soft tissue tension may be a major contributor to this finding. We do not know yet how flexibility of the joint relates to symptomatology, or if the surgeries performed for HR affect flexibility. Further research will be required to determine the clinical utility of these measurements.

Category: Midfoot/Forefoot Introduction/Purpose: While Metatarsus Primus Elevatus (MPE) has been implicated in the development of hallux rigidus, previous studies have presented conflicting findings regarding the relationship between an elevated first metatarsal and arthritis. This may be due to the variety of definitions for MPE and the radiographic measurement techniques that are used to assess it. The aim of this study was to examine the reliability of new radiographic measurements that take into account the elevation of the first metatarsal in relation to the proximal phalanx, rather than in relation to the second metatarsal as previously described, to assess for MPE. In addition, we aimed to determine whether the elevation of the first metatarsal was significantly different in hallux rigidus patients than in a control population. Methods: A retrospective chart review was conducted from prospectively collected registry data at the investigators’ institution to identify patients with hallux rigidus (n=65). A size matched control cohort of patients without evidence for first metatarsophalangeal (MTP) joint arthritis were identified (n=65). Patients with a previous history of foot surgery, rheumatoid arthritis, or hallux valgus were excluded. Five blinded raters of varying levels of training, including two research assistants, a senior orthopedic resident, a foot & ankle fellow, and an attending radiologist, evaluated seven radiographic measurements for their reliability in assessing for MPE in hallux rigidus and control groups. Four of the seven measurements were newly designed taking into account the relationship of the first MTP joint. Inter- and intrarater reliability were calculated using Intraclass Correlation Coefficients (ICC) and categorized by Landis and Koch reliability thresholds. The measurements between the hallux rigidus and control populations were compared using an independent t-test. Results: Six of the seven radiographic measurements were found to have substantial to almost perfect interrater reliability (ICC=0.800 to 0.953) between all levels of training, except for the Proximal Phalanx-First Metatarsal Angle which showed moderate reliability (ICC=0.527) (Table). Substantial to almost perfect intrarater reliability (ICC=0.710-0.980) was demonstrated by the research assistants. Six of the seven measurements taken by the attending radiologist demonstrated significant differences in first metatarsal elevation between the hallux rigidus and control populations with the hallux rigidus group showing increased elevation (p=0.000-0.020). Only the First Metatarsal Elevation Angle failed to show a significant difference between the populations (p=0.368). However, the First Metatarsal Elevation Angle measurements of the research assistant and the senior orthopedic resident did show a significant difference between the two populations (p

Category: Ankle, Sports Introduction/Purpose: Hamstring tendon autografts (gracilis and/or semitendinosus) may be used as an alternative to allograft or local tendon grafts in foot and ankle surgery, primarily for tendon or ligament repairs in which direct repair has failed or is not possible. Advantages of hamstring autografts include avoiding the expense and lower healing potential of allografts, as well as the morbidity associated with local tendon grafts. While hamstring harvest has been abundantly studied in the setting of concomitant knee surgeries, few authors have investigated its effects when used specifically for foot and ankle applications. We studied a cohort of patients who underwent hamstring harvest for foot and ankle applications, hypothesizing that morbidity to the knee would be limited and foot and ankle outcome scores would be good. Methods: All patients who underwent hamstring autograft for foot or ankle applications by a fellowship-trained sports surgeon since 2011 were screened for inclusion. Patients were eligible if they were over the age of 18, had no history of knee pathology, and were at least one year from surgery. 23 patients were enrolled an average of 23 months post-operatively (range, 12-59 months). The average age was 51 ± 18 (range, 18-77) and 50% were women. Isokinetic testing was performed using a Biodex dynamometer, with the administering physical therapist blinded to side of surgery. Peak flexion and extension torque as well as flexion and extension torque at 30, 70, and 90 degrees of flexion were collected at two different testing speeds, 180 and 300 degrees/second. Pre- and post-operative questionnaire scores—the Foot and Ankle Outcome Score (FAOS) and Short Form (SF)- 12—were retrospectively reviewed. T-tests were used for all comparisons. Results: Of the 23 patients enrolled, gracilis was harvested in 14, semitendinosus in six, and both tendons in three to reconstruct the lateral ankle ligaments (eight patients), tibialis anterior (six), Achilles (five), and peroneus brevis (four). At follow-up, 19 patients (83%) reported no pain at the harvest site; the remaining four patients reported mild to moderate symptoms. There were no significant differences between relative flexion strength at different degrees of flexion or between relative flexion and extension strength, with strength considered as a percentage of that of the non-operated leg (Table). All five FAOS subscales and the SF-12 physical component subscale improved significantly (p=0.01 for all). No patients were dissatisfied and all would recommend the surgery to someone else. Conclusion: When used for foot and ankle surgery, hamstring autografts result in good functional outcomes and high patient satisfaction, with few patients experiencing symptoms from the harvest site at follow-up. Although our study was limited by its small number of patients and lack of preoperative isokinetic testing for comparison, effects on knee flexion strength do not appear to be clinically significant. Further work with larger numbers of patients will be required to identify small effects on knee flexion strength and to delineate differences between harvesting gracilis and semitendinosus.

Category: Patient expectations Introduction/Purpose: Patients’ expectations from orthopaedic surgery may strongly affect postoperative satisfaction and have been shown to relate to many different factors, including age, sex, functional status, and health. However, the diverse diagnoses in foot and ankle surgery may also influence expectations. While pain relief tends to be the predominant expectation of orthopaedic foot and ankle patients, there are certain expectations that may be more important for patients with certain diagnoses. In this study, we aimed to analyze differences in patients’ expectations among the major surgical diagnoses seen in foot and ankle practices. Methods: 352 patients undergoing elective foot and ankle surgery by six orthopaedic foot and ankle surgeons were enrolled over eight months. Patients completed the Foot & Ankle Surgery Expectations Survey preoperatively, as well as the Foot & Ankle Outcome Score (FAOS), Short Form (SF)-12, Patient Health Questionnaire (PHQ)-8, Generalized Anxiety Disorder 7-item scale (GAD-7), and pain visual analog scale (VAS). The expectations survey is scored from 0-100 with higher scores indicating greater expectations. Each of its 23 items can also be assessed independently. Differences in expectations scores between diagnoses were analyzed with t-tests and analysis of variance (ANOVA). Differences in the number of expectations and number of expectations with complete improvement expected were analyzed with Mann-Whitney U and Kruskal Wallis tests. Results: Patients with a diagnosis of ankle instability or osteochondral lesion (OCL) had higher expectations scores (p = 0.004) and more often expected complete improvement (p = 0.024) compared to patients with other diagnoses (Table). Patients with hallux valgus had lower expectations scores (p = 0.005) than patients with other diagnoses. Patients with mid- or hindfoot arthritis also had lower expectations scores (p = 0.006) and even more significantly, had an average of only 2.4 expectations with complete improvement expected, while all other patients averaged 8.4 (p < 0.001). Expectations that were relatively unique to specific diagnoses included increased shoe variety for hallux valgus and hallux rigidus, improved appearance for hallux valgus, and improved ability to run for exercise for ankle instability or OCL. Conclusion: Patients’ expectations of foot and ankle surgery vary widely by diagnosis. Higher expectations among patients with ankle instability/OCL may be related to worse functional and mental health status (Table). Lower expectations among patients with hallux valgus and mid- or hindfoot arthritis may be attributable in part to patients’ recognition of the difficulty of treating their condition. Preoperative counseling by their surgeons regarding realistic expectations may also be a factor. We can use the findings of this study to predict what expectations are most important to patients with different diagnoses and to guide how we counsel them prior to surgery.

Category: Other Introduction/Purpose: Few authors have investigated patients’ expectations from foot and ankle surgery, and standardized means of assessing expectations are lacking. Managing patients’ preoperative expectations may help improve their ultimate satisfaction with surgery. In a previous study (in press), we developed a valid and reliable patient-derived expectations survey for patients undergoing foot and ankle surgery. In this study, we aimed to examine relationships between patients’ preoperative expectations and their demographic and clinical characteristics. We hypothesized that patients with more disability and those with anxiety or depressive symptoms would have greater expectations. Methods: All adult patients scheduled for elective foot or ankle surgery by one of six orthopaedic foot and ankle surgeons were screened for inclusion over eight months. Preoperatively, patients completed the Foot & Ankle Surgery Expectations Survey in addition to the Foot & Ankle Outcome Score (FAOS), Short Form (SF)-12, Patient Health Questionnaire (PHQ)-8, Generalized Anxiety Disorder 7-item scale (GAD-7), and pain visual analog scale (VAS). The expectations survey contains 23 expectations categories, each with five answer choices ranging from I do not have this expectation to complete improvement expected. It is scored from 0-100; higher scores indicate greater expectations. Differences in expectations score with categorical variables were assessed with t-tests and single factor analysis of variance (ANOVA). Differences in number of expectations and number of expectations with complete improvement expected were assessed with Mann-Whitney U and Kruskal Wallis tests. Relationships between expectations and continuous variables were assessed with linear regression. Results: 352 patients (average age 55 ± 15, range 18 to 86) were enrolled. Expectations were not significantly related to age. Women expected to achieve complete improvement more often than men (p = 0.011). Other factors significantly associated with higher expectations (p < 0.05) included non-Caucasian race, workers’ compensation, use of a cane or other assistive device, diagnosis of ankle instability or osteochondral lesion, and greater medical comorbidity (Table). Patients with a history of prior orthopaedic surgery were less likely to expect complete improvement. Worse function and quality of life (as assessed by all FAOS subscales and SF-12 physical and mental components), more depressive and anxiety symptoms, and higher pain VAS scores were associated with higher expectations scores and more expectations (p < 0.001 for all). Conclusion: The results of this study may help inform surgeons’ preoperative discussions with their patients regarding realistic expectations from surgery. Generally patients with worse function and more disability had higher expectations from surgery. Addressing these patients’ expectations preoperatively may help improve their ultimate satisfaction with surgery.

Background: Ankle fracture surgeries are generally safe and effective procedures; however, as quality-based reimbursement models are increasingly affected by postoperative readmission, we aimed to determine the causes and risk factors for readmission following ankle fracture surgery. Methods: Ankle fracture cases were identified from the prospectively collected American College of Surgeons National Surgical Quality Improvement Program from 2013 to 2014. Demographics, comorbidities, and fracture characteristics were collected. Rates of 30-day adverse events and readmissions were determined as well as the causes for readmission. Multivariable logistic regression analyses were performed to identify risk factors associated with having any adverse events and being readmitted within 30 days of surgery. Results: There were 5056 patients included; 167 (3.3%) were open fractures. The rate of any postoperative adverse event was 5.2%. There were 116 unplanned readmissions, with a readmission rate of 2.3%. Of the 116 unplanned readmissions, 49 (42.2%) were for reasons related to the surgery or surgical site, with the most common causes being deep surgical site/hardware infections (12.9%), superficial site infections (11.2%), and wound disruption (6.9%). Most readmissions were for reasons unrelated to the surgical site (51.7%), including cardiac disorders (8.6%), pulmonary disorders (7.8%), and neurological/psychiatric disorders (6.9%). The cause of readmission was unknown for 6% of readmissions. With multivariable logistic regression, the strongest risk factors for readmission were a history of pulmonary disease (odds ratio [OR], 2.29), American Society of Anesthesiologists (ASA) class ≥3 (OR, 2.28), and open fractures (OR, 2.04) (all P < .05). Conclusion: In this cohort of 5056 ankle fracture cases, 2.3% of patients were readmitted within 30 days, with at least 51.7% of all unplanned readmissions due to causes unrelated to the surgery or surgical site. Predictors of readmission included a history of pulmonary disease, higher ASA class, and open fractures. Based on these findings, we advocate close medical follow-up with nonorthopaedic providers after discharge for high-risk patients. Level of Evidence: Level III.