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Background Given the continued growth of Reverse Shoulder Arthroplasty (RSA), it is important to optimize factors that contribute to successful outcomes. Rehabilitation after RSA is critical to achieve successful outcomes including patient function and satisfaction however, the ideal rehabilitation program has not been established. The purpose of this study was to evaluate the effect of early mobilization (EM) compared to delayed mobilization (DM) on outcomes and function following RSA. Methods A retrospective study of prospectively collected data was performed comparing 67 RSA patients in two groups: the EM group began a rehabilitation program immediately after surgery and DM group began after 4-6 weeks postoperative. Preoperative and postoperative Constant Shoulder Score (CSS), American Shoulder and Elbow Surgeons score (ASES), Penn Shoulder Score (PSS), Shoulder Satisfaction Value (SSV) as well as demographics, opioid usage, range of motion, 90-day complications, reoperation, and readmission rates were collected. Statistical analysis was performed between each group’s outcomes and for the change (delta) of outcomes from baseline to each postoperative time point. Results At 6 weeks postoperatively, EM group showed significantly higher scores in ASES function, PSS, active forward elevation, passive forward elevation, active external rotation, and passive external rotation. There was significantly lower narcotic usage in the EM group at 6 weeks. At 3 months postoperatively, the EM group showed lower numerical rating score (NRS) for pain and higher active forward elevation. At last follow-up, there was a lower NRS and greater degree for all ranges of motion for the EM group compared to the DM group. A greater change from baseline to 6 weeks postoperative was seen for EM group in SSV, ASES function, PSS, active forward elevation, passive forward elevation, and internal rotation. From baseline to 3 months postoperative, ASES pain, PSS, active forward elevation, and passive forward elevation improved significantly in the EM group. At final follow-up, active forward elevation increased greater for EM group. There were 3 complications (2 hematomas, 1 infection) in the DM group and none in the EM group. Conclusion The early mobilization rehabilitation protocol following RSA achieved lower opioid usage at 6 weeks, lower pain scores at each time point and better ROM during final follow-up compared with delayed mobilization protocol. There were no complications reported with the EM protocol, suggesting it is a safe alternative for postoperative recovery. Orthopedic surgeons should consider the early mobilization rehabilitation protocol after RSA.

Background In the past few years 3-dimensional (3D) automated software for preoperative planning in shoulder arthroplasty has increased in practice. It has been used to improve accuracy on implant placement, size, and selection, especially on the glenoid side. New additions have been added however, to look at prediction of range of motion (ROM) for after surgery. Therefore, the purpose of this study was to assess the accuracy of the software feature of predicting impingement-free range of motion compared to postoperative functional outcomes. Methods A shoulder arthroplasty database including 192 patients was reviewed and 55 patients who underwent a primary RSA without evidence of preoperative fracture, trauma, or neurological associated diseases which could impact postoperative rehabilitation were included in the study. Preoperative plans for RSA were created for all patients based on preoperative shoulder CT scan and each patient's preoperative predictive ROM (PROM) suggested by the software was recorded. These PROM were then compared to postoperative final follow-up clinical range of motion for accuracy (CE ROM). Demographic information and Walch classification were recorded. Results Our cohort was composed of 30 males and 25 females with an average age of 71.2 years old and mean BMI 30.0 kg/m2. The predominant diagnosis was rotator cuff arthropathy (RCA: 32 patients) followed by severe osteoarthritis (SOA: 19 patients). The mean difference between clinical and predicted ROM for active FF was 42° (SD = 46°), passive FF was 61° (SD = 39°), passive ABD was 81° (SD = 33°), active ER was 22° (SD = 22°), and passive ER was 24° (SD = 25°). Our results also showed that the CE ROM was significantly higher than PROM for each clinical measurement (P Conclusion Not all features available in preoperative planning for RSA using 3D automated software can be translated into practice. Our results demonstrated PROM weakly correlated with CE ROM for patients who underwent RSA. Surgeons need to be aware that surgical decisions should not be altered based on this feature. More research needs to be done to validate this new tool incorporating both scapulothoracic motion and clinical correlation with predictive ROM. As we move into the era with 3D preoperative simulation and optimizing outcomes for shoulder arthroplasty these features incorporating clinical outcomes and function will be critical to consider. Level of Evidence Level III.

Background Although it has been shown that Medicare populations have a higher overall rate of complications than those with private insurances for large cohort total joint studies, there is limited information comparing patient-reported outcomes (PROs) among private insurance patients. The purpose of this study was to determine the impact of non-Medicaid insurance type on outcomes after shoulder arthroplasty. Methods This retrospective case-controlled study included 203 patients who underwent shoulder arthroplasty from 2012 to 2017 by a single surgeon. Preoperative and postoperative PROs were collected and included the Simple Shoulder Test, the American Shoulder and Elbow Surgeons Shoulder Assessment Form, and the Constant Shoulder Score. Patients were categorized into groups based on insurer—preferred provider organization, health maintenance organization, Medicare, and Veterans Affairs Care program—and outcomes were compared between groups Results The 4 insurance provider groups were matched for body mass index, surgery type, and comorbidities (P = .526). Preoperatively, no significant differences in PROs between groups were present except for the Constant Shoulder Score (P = .029). All payer groups significantly improved from preoperative to postoperative PROs (P ≤ .001). At the final follow-up, no significant difference in PROs between groups were seen (American Shoulder and Elbow Surgeons Shoulder mean 75.3 ± 20.9 [P = .757], Simple Shoulder Test of 9.1 ± 2.9 [P = .312], and Constant Shoulder Score of 65.0 ± 15.2 [P = .526]). Conclusions Our results suggest variations in insurance type did not significantly impact outcomes for our cohort of patients undergoing shoulder arthroplasty. Although variations in patient cohorts exist, patients regardless of insurance type and coverage variations can expect significant improvements in their function and pain after shoulder arthroplasty.

Background There is an increasing need to understand what barriers are present to reduce opioid consumption in orthopedic practice. The purpose of this study was to better understand patient perceptions and understanding of opioid use after shoulder surgery. Methods Eighty-five patients who underwent shoulder surgery anonymously completed a 27-question survey adapted from the Maryland Public Opinion Survey on Opioids with additional demographics. The patients were asked about pain expectations after surgery, use of and access to opioids, opioid perceptions, and information provided regarding safe use, storage, and disposal of opioids. Results When asked about receiving information regarding opioids, only 36% of the patients reported having a conversation with their physician. When asked about appropriate use, 10% agree it is permissible to take more than the recommended dosage of prescription narcotics if they are feeling more pain than usual and 8.5% of the patients reported taking an opioid to get high multiple times in the past year. Furthermore, a majority agreed that opioids may lead to other substance abuse with 76% reporting the risk of harm to be great, and only 55% believing that opioid abuse may lead to overdose or death. Conclusions Surgeons need to be aware that most patients expect to have significant pain after shoulder surgery and expect to be given necessary and continued amounts of opioids. This highlights the need for better counseling and innovative nonopioid pain management protocols. At the institutional level, more effort needs to be made on providing adequate education and disposal mechanisms to help reduce diversion and misuse.

Background: Orthopedic surgeons are the third-highest prescribers of opioid medications, and the recent opioid crisis has placed more scrutiny on physicians and their prescribing habits. House Bill 21, a new law limiting the prescription of opioid medications, was signed in Florida on July 1, 2018 and similar laws have been passed in a number of other states as well. The purpose of this study was to understand the effect of new legal mandates on opioid prescribing patterns and dependence rates for patients undergoing reverse shoulder arthroplasty. Methods: A retrospective review of 143 patients who underwent primary reverse shoulder arthroplasty from 2017 to 2019 was performed. There were 87 patients in the pre-legislation group (group 1), compared to 56 in the post-legislation group (group 2). Demographics data and opioid prescriptions provided 90 days before and after surgery were obtained using the physician drug monitoring database. Descriptive statistics and Student's t-tests were used to examine differences. Results: Preoperatively, both groups received similar numbers of pills and total morphine equivalents (TMEs; group 1: 47.3 pills and 59.9 TMEs, group 2: 30.9 pills and 24.8 TMEs) (P = .292, P = .081). Group 1 had 88.5% of patients fill an opioid prescription postoperatively, compared to 50.9% of group 2 (P

Introduction Reverse shoulder arthroplasty (RSA) alters normal anatomic relationships and results in increased deltoid forces. Which alter physiologic stress patterns in the acromion resulting in fractures. The purpose of this study was to evaluate the effect of acromion anatomy on the stress levels and risk of acromial fracture after RSA. Methods A lateralization onlay design of the Exactech Equinoxe RSA standard stem was used for all four different acromial sizes (ranging from −5.0 mm to +5.0 mm) and compared to standard normal shoulder model (acromial size 0). A finite element analysis (FEA) model was then constructed for each case and quasi-static analysis was carried out to determine the highest minimum principal stress (HMPS) for each case and this was used to predict fatigue life percentage (FLP) of the acromion. Results For smaller acromion sizes of −5 mm and -2.5 mm, the HMPS was found to be 1.87 and 1.24 times higher than the standard, respectively. The HMPS for the +2.5 mm acromial size was 0.95 times compared to the standard and 1.04 times higher for the +5 mm acromial size. According to our model, the highest FLP was seen when the acromion size was +2.5 mm (case 4 - 178%) and the lowest FLP was seen when it was -5 mm (−0.06%). Conclusion Our results suggest that there is an optimal acromion size (+2.5 mm from normal male) that leads to the lowest fracture risk in RSA. Surgeons must be aware of acromion size as a critical factor in deltoid tensioning, acromial stress, and risk of acromial fracture when selecting optimal implant designs and sizes for RSA. Level of evidence: Basic Science Study

Background With the rapid growth of shoulder arthroplasty (SA) over the past decade, the focus has been on improving outcomes and minimizing complications. As a result, preoperative planning tools have become a trend among orthopedic surgeons for SA to aid in achieving optimal implant selection and ultimately continual improvement of outcomes. Success in achieving these goals is predicated on software precision and reliability. Therefore, the purpose of our study was to assess the accuracy of three dimensional (3D) preoperative planning software in guiding orthopaedic surgeons for implant selection in SA. Methods This was a retrospective study of 76 patients who underwent SA all with the same manufacturer's implants by a single fellowship-trained shoulder surgeon. All patients had preoperative CT scans and completed 3D preoperative plans. The final implant selection was decided intraoperatively solely under surgeon's discretion based on review of preoperative plan, intraoperative bone quality, and soft tissue balancing, not restricted by the preoperative plan. Software accuracy was assessed by directly comparing each component size planned to the actual implant selected in the procedure for both humeral and glenoid components. Statistical analyses was performed including paired-sample t tests and rate for perfect matching. Results Our results demonstrated glenoid implant size matched perfectly in 75% of cases and 100% within 1 size in anatomic total shoulder arthroplasty (TSA). Humeral head diameter matched perfectly in 31% of cases and 100% within 1 size. Humeral head thickness matched perfectly in 69% of cases and 100% within 1 size. For reverse shoulder arthroplasty, glenoid baseplate diameter matched perfectly in 81% of the cases and 100% within 1 size. Glenosphere diameter matched perfectly in 88% of the cases and 98% within 1 size. Humeral stem size in both groups were more variable than the remaining components. Conclusion Our study demonstrates that 3D preoperative planning was accurate to guide intraoperative implant selection for both anatomic and reverse SA including both glenoid and humeral components within 1 size. This tool may decrease the need for extensive inventory and instrumentation by improving operating room workflow and surgeon efficiency and may ultimately be translate into better postoperative outcomes. Level of evidence Level IV; Case Series

Background Shoulder arthroplasty is technically demanding and can be associated with failures due to implant loosening, especially in the presence of posterior glenoid bone loss. Novel preoperative planning has been employed more frequently in an attempt to improve implant positioning, however, there is little data comparing the effectiveness of various systems for shoulder arthroplasty. Our goal was to assess the reliability and validity of preoperative planning software systems for measurements and implant selection. Methods A retrospective analysis was done of 80 patients who underwent total shoulder arthroplasty. Preoperative computed tomography studies were used to create a preoperative plan using 3 software systems: independent preoperative plan software (IPPS) and 2 automated manufacturer preoperative simulation (AMPS I and II). We collected preoperative native and implant version and inclination and implant size from each software. Simulated plans of each patient were compared to one another. Results The mean age of our population was 61 years old (±12), 51.3% females and 48.8% males. The mean native version measured by IPPS was −9.1° ± 11.3°, by AMPS I was −11.7° ± 8° and by AMPS II software was −11° ± 13.4° The mean native inclination for IPPS was 4.7° ± 6.8°, for AMPS I was 10.4° ± 5.9° and for AMPS II software was 7.76° ± 7.2° The mean implant version for IPPS was −4.8° ± 6.5°, for AMPS I was −6.73° ± 2.6° and for AMPS II software was −5.4° ± 5° The mean implant inclination suggested by IPPS was 2.04° ± 4.4°, by AMPS I was 3.5° ± 3.2° and by AMPS II software was 7.04° ± 7.2° Five of 14 comparisons resulted in statistically significant differences. Our results demonstrated strong positive correlations (r > 0.7) between AMPS I and AMPS II for Native Version and Implant Inclination. When implant diameter/size was compared between IPPS and AMPS II, AMPS I and AMPS II, we found a matching rate of 66.7% and 100%, respectively. Conclusion Our results support the use of either independent or commercially available preoperative simulation software to reliably measure pathology and accurately guide intraoperative implant selection. Notwithstanding, some manufacturer's software (AMPS II) provide more critical data, enhancing precision in implant placement and correction of pathologic bone loss. Level of evidence Level III.

Background Opioid analgesics play an essential role in postoperative pain management; however, they are also associated with high rates of abuse and decreased patient outcomes. With the declaration of the recent opioid crisis, more scrutiny has been placed on physicians and their prescribing habits, and orthopedic surgeons have been shown to be the third-largest providers of opioids. Many patients undergoing reverse shoulder arthroplasty (RSA) have acute and chronic pain and may be prescribed opioids. The purpose of this study was to understand opioid-prescribing patterns across all specialties for patients undergoing RSA. Methods A retrospective review of preoperative and postoperative opioid use in 407 patients who underwent RSA from 2012 to 2015 was performed. Demographic data including age, sex, race, ethnicity, body mass index, American Society of Anesthesiologists class, and smoking status were recorded. Opioid prescriptions within 90 days before and after surgery were collected using state-mandated prescription drug–monitoring databases. Prescriber specialty was recorded, and prescriptions were categorized as follows: orthopedic surgery, primary care or internal medicine, pain management and anesthesia, dentistry, and emergency medicine. Results The cohort was composed of 236 women (58.0%) and 171 men (42.0%). The average age was 71 years. Forty-six percent of patients received preoperative prescriptions, of which 24.7% were written by orthopedic surgeons and 60.0% were written by internal medicine specialists. Preoperatively, 20% of patients received >3 prescriptions for opioids, and postoperatively, 36.4% of patients received >3 opioid prescriptions. Fifty-nine percent of all postoperative prescriptions were written by orthopedists, and 35.2% were written by internal medicine specialists. Conclusion Not surprisingly, orthopedic surgeons prescribed the majority of postoperative prescriptions. Increased awareness, however, of preoperative prescribing habits by other specialty providers may be needed, with communication of their prescriptions to orthopedists, as preoperative use is the strongest predictor of postoperative dependence on opioids. Physicians should be aware of the number of patients receiving multiple prescriptions and their contribution to dependence with continued refills postoperatively. Therefore, surgeons must be more meticulous in assessing opioid consumption before surgery, as well as which providers are writing prescriptions after surgery, to limit opioid dispensation.

Introduction As the number of shoulder arthroplasties (SA) increased exponentially over the past two decades, so have associated complications and revision surgery rates. Pain control after revision surgery can be difficult to manage given patients are not typically opioid naive, however, to date opioid usage after revision SA has not been studied. The purpose of our study was to compare opioid use and dependence after revision SA to a primary SA cohort. Methods A retrospective review was performed of revision and primary SA patients at a single institution from 2014 to 2016. The cohort was divided into two groups: primary (n=82) and revision (n=80) shoulder arthroplasty patients. Demographics including age, sex, BMI, ASA class and smoking status were collected. Opioid consumption within 90 days of SA was collected for the preoperative and postoperative period using a state drug monitoring registry and converted to Total morphine equivalence (TME) for analyses. Opioid dependence was defined as ≥2 opioid prescriptions within 3 months. ANOVA was used to compare TME between groups and Chi square test was used for categorical variables. Logistic regression analyses were performed to determine impact of various risk factors on postoperative opioid dependence. Results Demographics were similar between the two groups for BMI (p=0.73), sex (p=0.51), smoking status (p=0.49) and ASA class (p=0.96). There was a significant difference with the revision group having an average younger age (66.0 revision, 70.1 primary; p=0.005). The mean preoperative TME was significantly higher for revision SA cohort (115.2) compared to the primary SA cohort (31.5) and postoperatively 188.7 for the revision SA cohort compared to an average of 117 for the primary cohort (p Discussion Revision shoulder arthroplasty patients have higher rates of preoperative and postoperative opioid usage and dependence when compared to primary SA. Preoperatively dependent revision patients are more likely to remain dependent in the postoperative period than primary SA patients. Orthopaedic surgeons should be aware that revision SA patients have higher opioid dependence rates and require more opioids which may indicate the need for additional consideration for risk assessments, education, and interventions when performing revision SA surgery. Level of Evidence III

Background: The creation of pain as the fifth vital sign led to skyrocketing opioid prescriptions and a crisis with addiction and abuse among Americans. The purpose of this study was to evaluate the effectiveness of a patient engagement model including education and innovative opioid-free multimodal pain management to achieve an opioid-free recovery after shoulder arthroplasty (SA). Methods: Fifty patients undergoing SA were divided into 2 groups. In the opioid-free group (OFG), patients received additional preoperative education in combination with an innovative non-opioid multimodal pain management protocol and non-opioid alternatives. Patients were compared regarding pain levels and opioid consumption at 48 hours and at 2 weeks, as well as patient-reported outcome measures, using Student t tests. Results: No significant differences were found in age (average, 69.76 years) (P = .14), American Society of Anesthesiologists grade (average, 2.25) (P = .24), sex, body mass index (average, 29.5) (P = .34), or comorbidity burden. In the OFG, 24% of patients reported use of rescue opioids (

Introduction Reverse shoulder arthroplasty (RSA) has seen exponential growth over the past 2 decades. In addition, the recent focus on opioid usage and dependence has led to an increased understanding of the risk factors that lead to dependence. The purpose of this study was to examine associations between diagnosis and opioid consumption and dependence in RSA. Methods A retrospective review was performed of 441 patients who had undergone a primary RSA from 2012 to 2016. Demographics were collected and patients were categorized based on top 4 diagnoses: glenohumeral osteoarthritis (n = 129), irreparable rotator cuff tear (n = 85), rotator cuff arthropathy (RCA) (n = 184), and proximal humerus fracture (n = 69). Opioid consumption within 90 days surrounding surgery was recorded from Prescription Drug Monitoring Programs. Logistic regression was performed. Results Baseline characteristics for sex (P = .0001), ethnicity (P = .04), age (P = .01), and preoperative opioid use (P = .029) were significantly different. Patients with osteoarthritis had the lowest preoperative total morphine equivalents (TMEs) at 22.82 compared with fractures (53.36, P = .02) and RCA (46.54, P = .02). There was no significant difference in preoperative opioid dependence based on diagnosis (P = .16); however, postoperatively, the RCA group had the highest dependence at 40.3% (P = .03). In addition, there were no significant differences postoperatively in TMEs prescribed (P = .197). The preoperatively dependent patients were 8 times more likely to remain dependent regardless of diagnosis. Conclusion Patients with fractures consume the highest amounts of opioids surrounding surgery. Surgeons should tailor their preoperative education and pain management protocols accordingly based on diagnoses for RSA. In addition, increased awareness and protocols need to be implemented for preoperative opioid-dependent patients regardless of diagnosis.

Background: In the realm of shoulder surgery, arthroscopic rotator cuff repair (RCR) is one of the most painful procedures and is often associated with higher opioid consumption. The purpose of this study was to evaluate effectiveness of preoperative and postoperative patient education and multimodal pain management to achieve an opioid-free postoperative recovery after RCR. Methods: Sixty patients who underwent RCR were divided in 2 groups. All patientsreceived an interscalene nerve block and multimodal pain management. The opioid intervention group (OIG) in addition received preoperative education on expectations of pain, non opioid pain protocols, and alternate therapiesto minimize pain as well as customized postoperative instructions. Patients were compared on pain levels, opioid consumption, and outcomes scores preoperatively and at 48 hours, 2 weeks, and final follow-up. Patient-reported outcomes and opioid usage were compared and analyzed using student’s t-tests and logistic regression. Results: At 48 hours, 15% of OIG patients reported use of rescue opioids after surgery compared with 100% of control group patients. Zero percent of OIG patients reported opioid use at 2 weeks compared to 90% of control group patients (P = .0196). Patients in both groups showed significant improvements in all outcome scores (P ≤ .05). At 6 weeks, functional, Constant, and satisfaction outcome scores were all higher in the OIG (P

Low socioeconomic status and Medicaid insurance as a primary payer have been shown to influence resource utilization and risk-adjusted outcomes for total joint arthroplasty. The purpose of this study was to assess the effects of Medicaid primary payer status on outcomes following shoulder arthroplasty (SA). A retrospective review of shoulder surgery patients was undertaken to identify a matched cohort of 51 patients who underwent SA and were stratified based on insurance type into two cohorts: 28 Medicaid (M) patients and 23 non-Medicaid (NM) patients. Baseline demographics, resource utilization, and outcomes were compared as well as pre-and-postoperative patient-reported outcomes (PRO) and functional scores. PRO scores included the American shoulder and elbow surgeons score (ASES), the Penn shoulder score (PSS), and the subjective shoulder value (SSV). There were no statistically significant differences in demographics, comorbidities, or preoperative baseline scores between the cohorts, except for age (M: 55.3 years; NM: 67.5 years; p ≤ 0.001) and smoking status (M: 13 patients; NM: 4 patients; p = 0.029). Medicaid patients showed a slightly higher rate of missed follow-ups (M: 1.1 vs. NM: 0.9; p = 0.370). All Medicaid and non-Medicaid patients experienced significant improvement on PRO scores and active forward flexion. Medicaid patients demonstrated equivalent final postoperative scores for ASES (M: 65; NM: 57; p = 0.454), PSS (M: 63; NM: 51; p = 0.242), SSV (M: 70; NM: 69; p = 1.0) and range of motion measurements. Overall results suggest that Medicaid patients can expect significant improvement after SA and the same level of PRO’s compared to non-Medicaid-insured population. Level III, Retrospective Comparative Design, Treatment Study.

Histoplasma capsulatum periprosthetic knee infection has rarely been reported in the literature due to its low frequency. Notwithstanding, it is important to keep it among the differential diagnoses to avoid delays in treatment. The current report presents the case of infectious knee monoarthritis in an immunocompetent patient after unicompartmental knee arthroplasty. The joint infection was accompanied by disseminated histoplasmosis, which initiated an autoimmune reaction, ensuing a systemic inflammatory response syndrome. The management protocol used in this case was successful and included staged arthroplasty reconstruction combined with chronic antifungal and steroid pharmacotherapy. Approximately 4 years after total knee arthroplasty revision, there were no clinical signs of localized or systemic infection. Keywords: Periprosthetic joint infection, Histoplasmosis, Total knee arthroplasty, Systemic inflammatory response syndrome, SIRS

Background Augmented glenoid implants to correct bone loss can possibly reconcile current prosthetic failures and improve long-term performance for total shoulder arthroplasty. Biomechanical implant studies have suggested benefits from augmented glenoid components, but limited evidence exists on optimal design. Methods An integrated kinematic finite element analysis (FEA) model was used to evaluate optimal augmented glenoid design based on biomechanical performance in translation in the anteroposterior plane similar to clinical loading and failure mechanisms with osteoarthritis. Computer-aided design software models of 2 different commercially available augmented glenoid designs—wedge (Equinox; Exactech, Inc., Gainesville, FL, USA) and step (STEPTECH; DePuy Synthes, Warsaw, IN, USA) were created according to precise manufacturer's dimensions of the implants. Using FEA, they were virtually implanted to correct 20° of retroversion. Two glenohumeral radial mismatches, 3.5/4 mm and 10 mm, were evaluated for joint stability and implant fixation simulating high-risk conditions for failure. Results The wedged and step designs showed similar glenohumeral joint stability under both radial mismatches. Surrogate for micromotion was a combination of distraction, translation, and compression. With similar behavior and measurements for distraction and translation, compression dictated micromotion (wedge: 3.5 mm = 0.18 mm and 10 mm = 0.10 mm; step: 3.5 mm = 0.19 mm and 10 mm = 0.25 mm). Stress levels on the backside of the implant and on the cement mantle were higher using a step design. Discussion Greater radial mismatch has the advantage of providing higher glenohumeral stability with tradeoffs, such as higher implant and cement mantle stress levels, and micromotion worse when using a step design.

Recreation of glenohumeral biomechanics and humeral anatomy has been shown to improve outcomes in shoulder arthroplasty. Recent research has focused on utilizing simulation software and intraoperative instrumentation to improve glenoid implant selection and positioning, but no study had evaluated the reliability of new features in 3D preoperative planning software for humeral planning in total shoulder arthroplasty. Preoperative plans were created for 26 patients using three different simulation software programs: an independent preoperative planning simulation (IPPS) software (OrthoVis) and two automated manufacturers preoperative simulation systems: ArthrexVIP™ (AMPS I) and Tornier Blueprint™ 3D Planning (AMPS II). Preoperative plans were compared for reliability and consistency among different software systems based on available variables including humeral head diameter (HD) and head height (HH). The measured HD was consistent between the three systems with a maximum mean difference of 0.2 mm for HD among IPPS, AMPS I, and AMPS II (p = 0.964). There was a significant difference in measured humeral HH with 1.7 mm difference between IPPS and AMPS II (p ≤ 0.001). The strongest correlation when comparing humeral head measurements (diameter or height) obtained from all systems was seen between IPPS and AMPS I for humeral HD (r = 0.8; p ≤ 0.001). There was a high level of consistency between independent and manufacturer preoperative planning software for humeral head measurements. These preoperative planning systems can improve efficiency and workflow during surgery by guiding surgeons on implant size selection to optimally reconstruct the glenohumeral kinematics, in order to improve patient outcomes. Level III, study of nonconsecutive patients and without a universally applied “gold” standard study of diagnostic test.

The use of reverse shoulder arthroplasty (RSA) continues to grow with expanding indications and increased surgeon awareness. Previous data for other lower extremity joint replacements indicate that high-volume centers have better outcomes, with lower complication rates, decreased length of stay, and complications for both hemiarthroplasty and total shoulder arthroplasty. The purpose of this study is to evaluate the effects of hospital size and setting on adverse events for RSA. The National Inpatient Sample database was queried for RSA performed using ICD-9 codes. Primary outcomes included length of stay (LOS), total hospital charges, discharge disposition, and postoperative complications. Odds ratios were used to assess the risk of inpatient postoperative complications. A weighted national estimate of 24,056 discharges for patients undergoing RSA was included in the study. Patients at larger hospitals experienced higher total charges, increased average LOS, and slightly higher complication rates compared to those of small and medium hospitals. Patients in larger hospitals had significantly increased rates of genitourinary and central nervous system complications, while patients in small/medium hospitals experienced higher rates of hematoma/seroma. Results from this study indicate that large and non-teaching hospitals overall tend to burden the patients with higher hospital charges, longer hospital stay, and more frequent non-routine discharges. Also, larger hospitals are associated with higher risk of genitourinary and central nervous system complications rates, whereas non-teaching hospitals are associated with lower risk of infection and higher risk of anemia after RSA. With the growth in RSA in the USA, continued attention needs to be placed on improving outcomes and resource utilization for RSA patients even in larger hospitals.

Hypothesis and background Shoulder pain and dysfunction are common indications for shoulder arthroplasty, yet the factors that are associated with these symptoms are not fully understood. This study aimed to investigate the associations of patient and disease-specific factors with preoperative patient-reported outcome measures (PROMs) in patients undergoing primary shoulder arthroplasty. We hypothesized that worse mental health status assessed by the Veterans RAND 12-Item Health Survey (VR-12) mental component score (MCS), glenoid bone loss, and increasing rotator cuff tear severity would be associated with lower values for the preoperative total Penn Shoulder Score (PSS) and its pain, function, and satisfaction subscores. Methods We prospectively identified 12 patient factors and 4 disease-specific factors as possible statistical predictors of preoperative PROMs in patients undergoing primary shoulder arthroplasty at a single institution over a 3-year period. Multivariable statistical modeling and Akaike information criterion comparisons were used to investigate the unique associations with, and relative importance of, these factors in accounting for variation in the preoperative PSS and its subscores. Results A total of 788 cases performed by 12 surgeons met the inclusion criteria, with a preoperative median total PSS of 31 points (pain, 10 points; function, 18 points; and satisfaction, 1 point). As hypothesized, a lower VR-12 MCS was associated with lower preoperative PSS pain, function, and total scores, but patients with intact status or small to medium rotator cuff tears had modestly lower PSS pain subscores (ie, more pain) than patients with large to massive superior-posterior rotator cuff tears. Glenoid bone loss was not associated with the preoperative PSS. Female sex and fewer years of education (for all 4 outcomes), lower VR-12 MCS and preoperative opioid use (for all outcomes but satisfaction), and rotator cuff tear severity (for pain only) were the factors most prominently associated with preoperative PROMs. Conclusion In addition to mental health status and rotator cuff tear status, patient sex, years of education, and preoperative opioid use were most prominently associated with preoperative PROMs in patients undergoing shoulder arthroplasty. Further studies are needed to investigate whether these factors will also predict postoperative PROMs.

Background Considering that the United States is facing a crisis with opioid misuse and orthopedists are the third largest provider of these prescriptions, it is important to delineate risk factors associated with use and dependence. Our purpose was to identify risk factors for and patient characteristics of increased opioid use and postoperative opioid dependence in total shoulder arthroplasty (TSA) patients. Methods This was a retrospective study of 752 TSA patients who underwent surgery in 1 health care system from 2012-2016. Recorded variables included demographics and opioid prescriptions from prescription drug monitoring programs. Preoperative and postoperative opioid dependence was defined as continuous opioid prescriptions for at least 3 months prior to or after surgery. Statistical analyses and odds ratio analyses were performed. Results Of the 752 patients in total, 241 (32%) became or remained postoperatively dependent whereas 68% (511) were able to wean off of opioids by 3 months. In the preoperatively dependent cohort, only 27% were able to wean off opioids at 1 month and 53%, by 3 months postoperatively. Odds ratio calculations showed that patients with preoperative opioid use had a 3.52 (95% confidence interval, 2.433-5.089) times increased risk of postoperative dependence compared with opioid-naive patients. Of those receiving postoperative opioid refills, 69% were provided these refills by their orthopedic surgeons. Discussion and conclusions Although the majority of TSA patients weaned off of opioids after surgery, our results demonstrate a 3.5 times higher risk of postoperative dependence in patients who used preoperative opioids. Orthopedists were major contributors to continued postoperative opioid use, and increased efforts to minimize opioid prescriptions before, during, and after TSA may help curtail overuse and dependence. These results highlight the hazard that preoperative opioid use entails for shoulder arthritis patients.

Background Preoperative opioid use has been correlated to suboptimal outcomes in orthopedic surgery. This study evaluated the effect of preoperative opioid use on outcomes after arthroscopic rotator cuff repair (RCR). Methods A retrospective review was performed of 79 patients who underwent arthroscopic RCR; of these, 31 with a history of preoperative opioid use were compared with a control group of 48 patients without a history of preoperative opioid use. Preoperative and postoperative patient-reported outcomes and functional scores were compared. Results Both cohorts significantly improved on all patient-reported shoulder scores; however, the nonopioid group demonstrated significantly better postoperative patient-reported outcome scores (P = .015) and external rotation measurement (P = .008). Functional outcomes also significantly improved from preoperatively to postoperatively for forward flexion, but no differences were seen between groups. Conclusions Patients with a history of preoperative opioid use can still achieve significant improvements in outcomes after arthroscopic RCR, although not to the same extent as opioid-naive patients. Therefore, orthopedic surgeons must consider a patient's preoperative opioid use and temper expectations with regard to outcomes so that they are able to set realistic postoperative goals for patients undergoing RCR.

Background: Shoulder pain and dysfunction are common indications for rotator cuff repair surgery, yet the factors that are associated with these symptoms are not fully understood. Purpose/Hypothesis: This study aimed to investigate the associations of patient and disease-specific factors with baseline patient-reported outcome measures (PROMs) in patients undergoing rotator cuff repair. We hypothesized that tear size and mental health status, as assessed by the Veterans RAND 12-Item Health Survey mental component score (VR-12 MCS), would be associated with baseline total Penn Shoulder Score (PSS) and its pain, function, and satisfaction subscale scores. Study Design: Cross-sectional study; Level of evidence, 3. Methods: We prospectively identified 12 patient factors and 12 disease-specific factors as possible statistical predictors for baseline PROMs in patients undergoing surgical repair of superior-posterior rotator cuff tears at a single institution over a 3-year period. Multivariable statistical modeling and Akaike information criterion comparisons were used to investigate the unique associations with, and relative importance of, these factors in accounting for variation in baseline PSS and its subscale scores. Results: A total of 1442 patients who had undergone surgery by 23 surgeons met inclusion criteria, with a baseline median total PSS of 38.5 (pain, 12; function, 24.2; satisfaction, 2). Adjusted R2 in multivariable models demonstrated that the 24 general patient and disease-specific factors accounted for 22% to 24% of the variability in total PSS and its pain and function subscale scores. Large/massive tear size was significantly associated with worse PSS total score and function score but not pain or satisfaction scores. Lower VR-12 MCS was significantly associated with worse total PSS and all 3 subscale scores. Among other factors significantly associated with baseline PROMs were sex, race, preoperative opioid use, years of education, employment status, acromion status, and adhesive capsulitis. Lower VR-12 MCS, preoperative opioid use, female sex, and black race were the factors most strongly associated with baseline PROMs. Conclusion: Large/massive tear size, lower VR-12 MCS, and several additional patient and disease-specific factors are associated with baseline PROMs in patients undergoing rotator cuff repair. Further studies are needed to investigate whether these factors will also predict poor postoperative PROMs.

BACKGROUND There is a growing population of patients with history of solid organ transplant (SOT) surgery among total joint patients. Patients with history of SOT have been found to have longer lengths of stay and higher inpatient hospital costs and complications rates after hip and knee arthroplasty. The purpose of this study was to determine whether this is true for shoulder arthroplasty in SOT patients. METHODS The Nationwide Inpatient Sample was queried to describe relative demographic, hospital, and clinical characteristics, perioperative complications, length of stay, and total costs for patients with a history of SOT (International Classification of Diseases-9th Edition-Clinical Modificiation V42.0, V42.1, V42.7, V42.83) undergoing shoulder arthroplasty (81.80, 81.88) from 2004 to 2014. RESULTS A weighted total of 843 patients (unweighted frequency = 171) and 382,773 patients (unweighted frequency = 77,534) with and without history of SOT, respectively, underwent shoulder arthroplasty. SOT patients were more often younger and more likely to be male, have Medicare, and undergo surgery in a large teaching institution in the Midwest or Northeast (P

The influence of socioeconomic status and insurance type has not been studied extensively for RCR, particularly not in the high risk massive RCT population. The purpose of this study is to identify relationships between Medicaid payer status and patient outcomes following massive RCR. A retrospective review of shoulder surgery database identified 29 patients undergoing massive rotator cuff repair. Patients were stratified based on insurance type into two cohorts, Medicaid (14 patients) and non-Medicaid (15 patients). Missed routine follow-up appointments and comorbidities were recorded and compared between groups. Group comparisons were made for pre- and postoperative patient-reported and functional outcomes. Outcome scores included American Shoulder and Elbow Shoulder Score (ASES), the Penn Shoulder Score, and the Subjective Shoulder Value (SSV). A p value of

Background Manufacturers of reverse shoulder arthroplasty (RSA) implants have recently designed innovative implants to optimize performance in rotator cuff–deficient shoulders. These advancements are not without tradeoffs and can have negative biomechanical effects. The objective of this study was to develop an integrated finite element analysis–kinematic model to compare the muscle forces and joint reaction forces (JRFs) of 3 different RSA designs. Methods A kinematic model of a normal shoulder joint was adapted from the Delft model and integrated with the well-validated OpenSim shoulder model. Static optimizations then allowed for calculation of the individual muscle forces, moment arms, and JRFs relative to net joint moments. Three-dimensional computer models of 3 RSA designs—humeral lateralized design (HLD), glenoid lateralized design, and Grammont design—were integrated, and parametric studies were performed. Results Overall, there were decreases in deltoid and rotator cuff muscle forces for all 3 RSA designs. These decreases were greatest in the middle deltoid of the HLD model for abduction and flexion and in the rotator cuff muscles under both internal rotation and external rotation. The JRFs in abduction and flexion decreased similarly for all RSA designs compared with the normal shoulder model, with the greatest decrease seen in the HLD model. Conclusions These findings demonstrate that the design characteristics implicit in these modified RSA prostheses result in mechanical differences most prominently seen in the deltoid muscle and overall JRFs. Further research using this novel integrated model can help guide continued optimization of RSA design and clinical outcomes.

Background Since the early 1990s, opioids have been used as a mainstay for pain management surrounding fracture injuries. As opioid dependence has become a major public health issue, it is important to understand what factors can leave patients vulnerable. The purpose of this study was to examine what risk factors, patient or injury severity, contribute most to postoperative opioid dependence following surgical treatment of proximal humerus fractures (PHFs). Methods A retrospective review of all patients who underwent an open reduction and internal fixation of PHF was performed within a large multisite hospital system. Recorded variables included age, gender, ASA class, BMI, fracture type, time to surgery, pre- and postoperative opioid prescriptions, physical and psychological comorbidities, smoking status, and complications. Pre- and postoperative opioid dependence was defined as prescription opioid use in the 3 months leading up to or following surgery. Odds ratio calculations were performed for each variable, and a multivariate logistic regression was used to compare all predictors. Results A total of 198 surgically treated PHFs were included in the cohort with an average age of 59.9 years. Thirty-nine cases were determined to be preoperatively opioid dependent while 159 cases were preoperatively opioid naïve. Preoperative opioid dependence was found to be a significant risk factor for postoperative narcotic dependence, carrying a 2.42 times increased risk. (CI 1.07–5.48, p = 0.034). Fracture type was also found to be a risk factor for postoperative dependence, with complex 3- and 4-part fracture patients being 1.93 times more likely to be opioid dependent postoperatively compared to 2 part fractures (CI 1.010–3.764, p = 0.049). All other factors were not found to have any significant influence on postoperative opioid dependence. Conclusions Our results demonstrate that the most important risk factors of postoperative opioid dependence following proximal humerus fractures are preoperative dependence and fracture complexity. It is important for orthopedic surgeons to ensure that patients who have more complex fractures or are preoperatively opioid dependent receive adequate education on their increased risk and support to wean off of opioids following surgery. Level of evidence III

Fatty atrophy is a diagnosis characterized by the combination of fatty infiltration and muscle atrophy of the rotator cuff. Studies have shown a strong positive correlation between the level of fatty infiltration and the risk of experiencing a chronic rotator cuff tear. Therefore, the purpose of the present study was to review the current literature on radiographic imaging of fatty infiltration and fatty atrophy to better aid surgeons in predicting functional outcome and to help guide patient decisions.We conducted a literature search in PubMed. The exact search queries included "rotator cuff" in the MeSH Terms field; "fatty atrophy," fatty infiltration," and "fatty muscle degeneration" in the Title/Abstract field; and various combinations of these searches. We initially found 184 articles using these keywords, including both human and animal studies. The 25 animal studies were excluded, leaving 159 articles. The abstracts of all remaining articles were reviewed and selected on the basis of our inclusion criteria of focusing on patients with rotator cuff tears (preoperatively and postoperatively), fatty infiltration, fatty atrophy, and imaging modalities. We excluded an additional 127 articles, leaving 32 articles that were selected for the final review and inclusion in this study.Among 45 shoulder specialists across different studies, interrater agreement for Goutallier staging with use of magnetic resonance imaging (MRI) ranged from 0.24 to 0.82 and intrarater agreement for supraspinatus fatty changes ranged from 0.34 to 0.89. Our review also showed strong positive correlations when assessing the severity of fatty atrophy of the rotator cuff between MRI and ultrasound or ultrasound modalities such as sonoelastography.Increasing fatty infiltration of the rotator cuff is associated with greater repair failure rates and hence poorer overall clinical outcomes. MRI remains the gold standard for the imaging of rotator cuff tears and postoperative healing. Ultrasound can decrease health-care expenditures associated with the assessment of repair integrity postoperatively, although ultrasound is not as precise and has some limitations compared with MRI.

The lack of greater tuberosity (GT) healing in proximal humerus fractures has been negatively correlated with outcomes for hemiarthroplasty; however, there is still debate regarding the effects of GT healing in reverse shoulder arthroplasty (RSA). Our goal was to examine the effects of GT healing using a kinematic finite element analysis (FEA) model.Computer-aided design models of a medialized glenoid with a lateralized humerus (MGLH) RSA design were uploaded into an FEA shoulder model in 2 different configurations: healed greater tuberosity (HGT) and nonunion greater tuberosity (NGT). Deltoid muscle forces and joint reaction forces (JRFs) on the shoulder were calculated during abduction (ABD), forward flexion (FF), and external rotation (ER).Force magnitude of the anterior, middle, and posterior deltoid muscle as well as JRFs modeled in both GT scenarios were similar for ABD (muscle forces P = .91, P = .75, P = .71, respectively; and JRF P = .93) and for FF (muscle forces P = .89, P = .83, P = .99, respectively; and JRF P = .90). For ER, the force magnitude between 2 GT settings showed statistically significant differences (HGT: 9.51 N vs. NGT: 6.13 N) (P.001). Likewise, during ER, JRFs were different, and the NGT group showed a steep drop in JRF after 10° of ER (HGT: 28.4 N vs. NGT: 18.38 N) (P.001).GT healing does not seem to impact RSA biomechanics during abduction or forward flexion; however, it does affect biomechanics during external rotation. Overall orthopedic surgeons can expect good results for patients after RSA even with poor GT healing.

Background: The incidence of concussions is increasing in Major League Baseball (MLB), and the cost of these injuries in 2008 was reportedly as high as US$423 million. Team officials are more aware of concussion injuries, and one measure to address this issue was the creation of a concussion-specific 7-day disabled list (DL) in 2011. Purpose: To evaluate concussion trends among MLB players and the impact of concussion-specific 7-day DL status on postinjury player performance and team financials. Study Design: Descriptive epidemiology study. Methods: From 2005 to 2016, a total of 112 players placed on the DL because of a concussion were identified using the MLB website and were verified using established news databases. Salary information for players was collected using MLB published data, and cost was calculated with a previously published formula utilizing the injured player’s salary per game and adding the cost of his replacement. Performance metrics were compared before and after the rule change. Results: The mean number of days on the DL decreased from 38.8 before 2011 to 29.2 after 2011. The mean annual cost per player before 2011 was $1.1 million and decreased to $565,000 after the rule change. Regression analyses demonstrated a downward trend in the mean cost ( R = –0.61, P < .001). A comparison of postinjury performance metrics showed no significant differences with decreased time on the DL. Conclusion: The minimum 7-day DL change has not had a negative impact on reporting; instead, it has demonstrated decreased time on the DL and lower associated team costs. Performance metrics demonstrated no differences compared with before the rule change, suggesting that players are not negatively affected by decreased time on the DL.

Vani Sabesan,1 Zachary Steffes,2 Daniel J Lombardo,1 Graysen R Petersen-Fitts,1 Toufic R Jildeh2 1Department of Orthopaedic Surgery, 2Wayne State University School of Medicine, Detroit, MI, USA Abstract: Rugby participation in the US is increasing, and with its inclusion in the 2016 Summer Olympics, the increased participation rates are expected to continue. Naturally, as participation increases, so too do rugby-related injuries. The difference in injury patterns with regard to age and gender illustrates differences in how the game is being played. Understanding what accounts for these emerging injury patterns will help guide future injury prevention efforts. This study provides an update on injury rates for the growing population of rugby players in the US, especially young players. Our results focus on the variation of injury types and the injury rates of various levels of rugby players, including youth, collegiate, and recreational. Using injury data from the National Electronic Injury Surveillance System, we analyzed data in rugby patients for age, gender, body region, type of injury, and severity. We employed statistical weights to calculate national injury estimates. During the 10years studied, the trend in the number of rugby injuries among all age groups showed a statistically significant increase (R=0.804, P=0.005). The average age of injury was 21.5±6.3years with facial and head injuries constituting >33% of all injuries, representing a proportional increase of >10%. Men were most frequently injured in the face (18.2%) and head (15.9%); women were most frequently injured in the head (23%) and shoulder (12.3%). There were 9,059 concussions, constituting 7% of all injuries. Keywords: rugby, injury pattern, epidemiology

Eccentric posterior bone loss and associated glenoid retroversion represent challenges to glenoid placement during total shoulder arthroplasty. This bone loss can lead to poor stability and perforation of the glenoid during arthroplasty. The purpose of this study was to evaluate the morphology of glenoid bone loss for a spectrum of osteoarthritis patients using 3D computed tomography imaging and simulation software. This study included 29 patients with glenohumeral osteoarthritis treated with shoulder arthroplasty. Three-dimensional reconstruction of preoperative CT images was performed. Glenoid bone loss was measured at ten, vertically equidistant axial planes along the glenoid surface at four distinct anterior-posterior points on each plane. The images were fitted with modeled pegged glenoid implants to predict glenoid perforation. The 3D maps demonstrated greatest average bone loss posteriorly in the AP plane at the central axis of the glenoid in the SI plane. The average amount of bone loss was 3.85 mm. Walch A2 and B1 shoulders showed more central bone loss, while Walch B2 shoulders displayed more posterior and inferior bone loss. Patients with predicted peg perforation displayed significantly greater bone loss than those without predicted peg perforation (p = 0.037). Peg perforation was most common in Walch B2 shoulders occurring in the posterior direction involving the central and posterior-inferior peg. These data demonstrate an anatomic pattern of glenoid bone loss for different classes of glenohumeral arthritis. These findings can be used to develop various models of glenoid bone loss to guide surgeons, predict failures, and develop better glenoid implants. This study has been approved by the Cleveland Clinic IRB: Number 6235.

Reverse shoulder arthroplasty (RSA) is based on the biomechanical advantages of lengthening the deltoid while medializing its center of rotation (COR). Little evidence exists describing the clinical benefits of these biomechanical advantages. The purpose of this study is to assess the relationship between deltoid lengthening and medialization of the COR with functional outcomes for RSA patients. We retrospectively reviewed patients treated with primary RSA. Radiographic measurements of deltoid length and COR, assessment of forward elevation (FE) and external rotation (ER), and functional outcome scores were obtained pre- and postoperatively. Linear regression analyses were performed to assess the relationship between these radiographic measurements and changes in shoulder functionality. On average, patients improved significantly in function and functional outcome scores. Postoperative COR correlated weakly with postoperative FE. There were weakly negative correlations between increase in acromion to greater tuberosity distance and postoperative FE, and between deltoid lengthening and FE improvement. Our results suggest that deltoid lengthening does not correlate with improvements in active FE or ER. These findings could indicate that change in deltoid length is less important than previously thought. Furthermore, the negative correlations seen could indicate that there is over-tensioning of the deltoid in specific cases. Further studies are needed to better assess the role of deltoid length and other factors that may impact RSA outcomes.

Reverse shoulder arthroplasty (RSA) is an effective surgery for a variety of patients with difficult shoulder pathology. Since postsurgical outcomes are often variable, there has been great effort made to optimize the design and use of these implants. Previous studies demonstrated an association between increased glenosphere size and improved range of motion. The purpose of this study is to assess the relationship between glenosphere size, range of motion, and functional outcome scores. This is a retrospective cohort study of 140 patients (148 shoulders) undergoing reverse shoulder arthroplasty. All patients were assessed pre- and postoperatively for range of motion, Constant score, ASES score, and Subjective Shoulder Value. Improvements in these variables were compared for patients treated with three different glenosphere sizes (36, 40, 42 mm). All groups had a mean improvement in range of motion and functional outcome scores, but there were no statistically significant differences between groups when controlling for preoperative differences. Our findings do not support a strong role for glenosphere size as a singular factor affecting range of motion or patient-reported outcome following RSA. These problems are most likely due to the multifactorial nature of shoulder dynamics. For this reason, assessing the effect a single surgical or biomechanical parameter on function has been challenging.

Vani J Sabesan,1 Beau Prey,2 Ryan Smith,3 Daniel J Lombardo,3 Wilfredo J Borroto,4 James D Whaley5 1Levitetz Department of Orthopaedic Surgery, Cleveland Clinic Florida, Weston, FL, USA; 2Western Michigan University School of Medicine, Kalamazoo, MI, USA; 3Department of Orthopaedic Surgery, Wayne State University School of Medicine, Detroit, MI, USA; 4Ponce School of Medicine and Health Sciences, Ponce, PR, USA; 5Beaumont Health System, Detroit, MI, USA Background: Major League Baseball (MLB) players are throwing the ball faster and hitting harder than ever before. Although some safety measures have been implemented, by decreasing the 15days on the disabled list (DL) to the 7days on the DL, concussion rates remain high across positions and may impact player performance. Our hypothesis was, there would be an increase in concussion incidence following implementation of the 7 day DL, but this would not have a negative impact on player’s postconcussion performance.Study design: This is a descriptive epidemiology study.Methods: The concussed players from 2005 to 2016 were identified from the MLB DL and verified using established new sources. Position-specific performance metrics from before and after injuries were gathered and compared to assess effects of the injury. Postconcussion performance metrics were compared before and after the 7-day DL rule implementation.Results: A total of 112 concussed players were placed on the DL. For all position players, the batting average (BA) and on-base percentage (OBP) showed a nonsignificant decline after injury (P=0.756). Although performance statistics for pitchers declined on average, the trend was not statistically significant. Postinjury BA and OBP did not significantly change before (0.355) and after (0.313) the 7-day DL rule change in 2011 (P=0.162).Conclusion: The incidence of reported concussion has increased with the 7-day DL rule change. Concussion incidence was highest in catchers and pitchers compared with all other players. The most common causes identified as being hit by pitch or struck by a foul ball or foul tip. While new league rules prevent collisions with catchers at home plate, injury by a foul tip was the most common cause for concussion. The shortened time spent on the DL did not negatively impact player’s performance. Further research on protective helmets for catchers may reduce concussion incidence. Keywords: baseball, epidemiology, head injuries/concussion, MLB, performance

Introduction Hospital readmissions after elective shoulder arthroplasty represent a costly burden to the health-care system due to the rising demand for this procedure. Nevertheless, the reasons for readmissions remain inconclusive. Therefore, the main purposes of the current investigation were to determine (1) the readmission rates within 90 days after shoulder arthroplasty, (2) the reasons behind those readmissions, and (3) the characteristics of readmitted patients. Methods A retrospective review was performed on 184 patients who underwent total shoulder arthroplasty (TSA) or reverse shoulder arthroplasty (RSA) performed by a single surgeon at a single institution between 2010 and 2016. The readmissions that occurred within 90 days after surgery and their reasons were noted. Patient characteristics were compared between readmitted and non-readmitted patients. Results Overall, 7.1% of patients were readmitted within 90 days after shoulder arthroplasty. However, patients with a previous surgery on the same shoulder of the TSA or RSA had a higher rate (13.5%) than patients without a previous surgery (5.4%). Readmission rates for TSA and RSA were virtually identical. Most readmissions were due to surgical (69.2%) rather than medical complications (30.8%). The most common reasons for readmission were surgical-site infection and deep vein thrombosis. There were no statistically significant differences between the baseline patient characteristics of readmitted and non-readmitted patients. However, the proportion of males (69.2%) was more than twice the one of females (30.8%) among readmitted patients. Conclusion The readmission rate within 90 days after surgery was relatively low among patients who underwent either a TSA or RSA at our institution. Surgically related causes were largely responsible for readmissions.

Background: Musculoskeletal (MSK) disorders are one of the most common causes of disability and emergency department and physician visits in the United States. However, there is very little consistency in how physicians in training are prepared to treat MSK disorders. On the basis of published reports, medical school graduates have a relative lack of cognitive mastery in MSK medicine, even with the recent increase in instruction. This study sought to compare MSK education at an allopathic medical school with that at an osteopathic medical school. Methods: An anonymous survey of students in medical school graduate years 2, 3, and 4 at Michigan State University College of Human Medicine (allopathic) and College of Osteopathic Medicine (osteopathic) was conducted. Questions were structured into three main categories: demographic information, content of the current MSK curriculum, and opinions regarding importance, instruction, and assessment of MSK education. Results: As of 2010, 83% of medical schools require MSK courses because of the United States Bone and Joint Initiative to incorporate such coursework into core curriculum. Yet only 54% of surveyed students thought that their MSK education was adequate. A greater portion of osteopathic students (57.1%) compared with allopathic students (26.8%) thought that their MSK curriculum is adequate, and as a consequence, 36.6% of allopathic students thought that they were inadequately prepared for the MSK content of US medical licensing examinations compared with 8.1% of osteopathic students. Further curriculum development and improvement is needed to advance physicians' abilities to address and treat MSK disorders. Medical students surveyed feel that this goal can be accomplished by emphasizing MSK education in third and fourth years of medical school. Conclusion: These findings highlight differences in MSK education between an allopathic and osteopathic medical school. Further standardization of the curriculum in medical schools may help improve the quality of teaching student comfort levels of new physicians. Level of Evidence: Level III

Orthopaedic surgery maintains a large portion of the total health-care spending in the United States. In the near future, a greater importance will be placed on efforts to curtail health-care spending and on providing cost-effective care.The literature has established that there are substantial trea

To examine the cost metrics and profitability of rotator cuff repairs (RCRs) in a large health care system.A retrospective study was performed using value analysis team data from 2 hospitals within a large metropolitan health system from 2010 to 2014. Cost and profit metrics were collected and compared against surgeon volume, surgeon subspecialty training, implant costs, Current Procedural Terminology (CPT) coding, length of stay, and hospital site.A total of 5,899 RCRs were identified with a mean contribution margin of $2,133. Surgical supplies were the largest contributor to direct costs. Hospital site also significantly affected contribution margin ($1,912 at hospital 1 vs $3,129 at hospital 2, P.001). The number of billed CPT codes was not significantly correlated to contribution margin; however, significant differences were noted in contribution margin and direct cost associated with different CPT code combinations, with arthroscopic RCR with subacromial decompression and distal clavicle excision being the most profitable, at an average contribution margin of $2,147. There was no correlation between surgeon volume and contribution margin or direct cost.Our overall findings show that improvement in the profitability of arthroscopic RCR for hospital systems is possible, both by examining institutions' direct costs and by providing individual surgeons with cost breakdowns and contribution margin information to improve the profitability of their practice.Level IV, economic and decision analysis.

Background The “rocking horse” phenomenon is considered the main cause of glenoid component loosening by eccentric loading of the glenoid rim. This study aimed to investigate the influence of increasing glenohumeral implant mismatch on bone-implant interface micromotion in a cemented all-polyethylene pegged glenoid biomechanical model. Methods Five glenoid sizes, 40 mm, 44 mm, 48 mm, 52 mm, and 56 mm, representing +2 mm, +6 mm, +10 mm, +14 mm, and +18 mm glenohumeral mismatch, respectively, were cyclically loaded according to ASTM Standard F2028-08 at a constant frequency of 2 Hz to a size-dependent humeral head subluxation translation. Additional glenoid components were cyclically loaded to their subluxation translations at a constant humeral head rate of 4.4 mm/s. Component micromotion was characterized as compression, distraction, and superior-inferior translation measured by differential variable reluctance transducers. Results During constant frequency tests, 52-mm and 56-mm glenoids were unable to complete cyclic testing because of catastrophic failure of the glenoid-implant interface and permanent glenoid deformation, probably due to increasing severity of testing parameters. When tested at a constant humeral head speed, 48-mm, 52-mm, and 56-mm glenoids had significantly increased glenoid distraction and glenoid translation at cycle 50,000 compared with cycle 1. Distraction and translation measurements for 52-mm and 56-mm glenoids were significantly greater compared with 40-mm, 44-mm, and 48-mm glenoids at 50,000 cycles. Conclusions In a biomechanical model, optimal glenohumeral mismatch in cemented pegged glenoid implants is multifactorial and has not been definitively established. However, our data suggest that a radial mismatch of less than +10 mm may decrease the risk of glenoid micromotion.

Fragility fractures of the proximal humerus and distal radius can have a significant impact on the elderly population, both economically and physically. Limited data are available to demonstrate the functional and economic impact of upper extremity fragility fractures. To investigate the economic and social impact that proximal humerus fragility fractures may have on an older population. A retrospective chart review for patients ≥50 years old treated as an inpatient at a local hospital between 2006 and 2012 for a proximal humerus or a distal radius fracture was done. Patients were divided into two groups to show age impact; Group 1 = 50–79 years old and Group 2 = 80 years and older. Eighty-six charts were reviewed, 38 for Group 1 and 48 for Group 2. Demographic, admission, inpatient, and discharge data were compared between groups. A third of patients in each group had a previous fragility fracture. Inpatient length of stay was comparable between groups. Surgical treatment was used at a higher rate in the younger cohort (p = 0.06). Approximate average hospital charges for an inpatient surgical treatment were about twice those of the non-surgically treated patients. Our results illustrate the significant burden of upper extremity fractures in terms of loss of independence, inpatient hospitalizations and prolonged nursing home or rehabilitation needs, which account for considerable health care costs. Fractures of the humerus, forearm and wrist account for one-third of the total incidence of fractures and can be a significant burden to individuals and the community.

Background Shoulder arthroplasty is the fastest growing joint replacement surgery in the United States, and optimal postoperative pain management is critical to optimize outcomes for these surgeries. Liposomal bupivacaine (LB) has gained popularity for its potential to provide extended postoperative pain relief with possibly fewer side effects. The goal of this study was to assess the impact of LB compared with continuous interscalene nerve block (CISB) in terms of postoperative pain control, outpatient pain scores, and patient-reported and functional outcomes after shoulder arthroplasty surgery. Methods A prospective randomized controlled clinical trial compared consecutive patients undergoing shoulder arthroplasty treated with CISB vs. LB with a single bolus interscalene block. The primary outcome measures included pain assessment up to 24 hours after surgery; in addition, all doses and times of narcotics administered during the inpatient stay were recorded. Patient-reported outcome measures for pain, satisfaction, and functional outcomes were recorded postoperatively. Results A total of 70 of 74 consecutive patients who underwent shoulder arthroplasty were included in the study. The LB group had equivalent narcotic use, pain scores, and time to first narcotic rescue compared with the CISB group within the first 24 hours (P > .05). The LB group had higher American Shoulder and Elbow Surgeons score and Penn Shoulder Score at final follow-up. There was an increased number of complications and cost for the CISB group. Conclusion This prospective randomized controlled trial demonstrated that LB provides excellent postoperative pain relief for shoulder arthroplasty patients. In addition, LB had fewer complications and lower cost, making it a promising addition to a multimodal pain regimen for shoulder arthroplasty.

Background Total shoulder arthroplasty is technically demanding in regard to implantation of the glenoid component, especially in the setting of increased glenoid deformity and posterior glenoid wear. Augmented glenoid implants are an important and innovative option; however, there is little evidence accessible to surgeons to guide in the selection of the appropriate size augmented glenoid. Methods Solid computer models of commercially available augmented glenoid components (+3, +5, +7) contained within the software allowed placement of the best fit glenoid component within the three-dimensional reconstruct of each patient's scapula. Peg perforation, amount of bone reamed, and amount of medialization were recorded for each augment size. Results There was strong correlation between the medialization of the joint line and the glenoid retroversion for each augmented component at neutral correction and correction to 6° of retroversion. At neutral, the range of retroversion that restored the anatomic joint line was -3° to -17° with use of the +3 augmented glenoid, -5° to -24° with the +5 augmented glenoid, and -9° to -31° with the +7 augmented glenoid. At 6° of retroversion, the range of retroversion that restored the anatomic joint line was -4° to -21° with use of the +3 augmented glenoid, -7° to -27° with the +5 augmented glenoid, and -9° to -34° with the +7 augmented glenoid. Conclusions There was a strong correlation between glenoid retroversion and medialization for all augment sizes, supporting the recommendation for glenoid retroversion as the primary guide in selecting the amount of augmentation.

Background: The published return-to-play (RTP) rates for Major League Baseball (MLB) pitchers who have undergone surgical repair of superior labrum anterior-posterior (SLAP) tears vary widely and are generally accepted to be lower in the subset of competitive throwers. The efficacy of surgical treatment for MLB players is largely unknown. Purpose: To examine the RTP rate and performance of MLB pitchers who have undergone SLAP tear repair between 2003 and 2010. Study Design: Descriptive epidemiological study. Methods: A retrospective review of MLB pitchers undergoing SLAP repair was performed using the MLB disabled list. Data collected included the following player statistics: earned run average (ERA), walks plus hits per inning pitched (WHIP), and innings pitched (IP). The mean values for performance variables both before and after surgery were compared. A definition of return to prior performance (RTPP) was established as an ERA within 2.00 and WHIP within 0.500 of preoperative values. Results: Twenty-four MLB players met inclusion criteria, of which 62.5% were able to RTP at the MLB level after SLAP repair surgery. Of those able to RTP, 86.7% were able to RTPP. However, the overall rate of RTPP, including those unable to RTP, was 54.2%. Mean performance analysis of the RTP group revealed a statistically significant decrease in IP for MLB pitchers throwing a mean 101.8 innings before injury and 65.53 innings after injury ( P = .004). Conclusion: Of those pitchers able to RTP, chances of a full recovery were good (86.7%). Our results indicate the need for future research aimed at proper surgical selection of who will return to play, as they will likely achieve full recovery. We believe this information can help surgeons advise high-level overhead-throwing athletes about expected outcomes for surgical treatment of SLAP tears.

Background: Glenohumeral osteoarthritis may be associated with severe posterior glenoid bone loss and glenoid retroversion. Treatment with total shoulder arthroplasty and autologous bone graft obtained from the humeral head has been infrequently reported in the peer-reviewed literature. Methods: The clinical and radiographic results of primary total shoulder replacement with an all-polyethylene glenoid component and autologous humeral head graft augmentation performed by a single surgeon in thirteen consecutive patients were evaluated. Results: Twelve of the thirteen patients were followed for a minimum of two years (average, fifty-three months; range, twenty-six to 110 months). The average glenoid retroversion on preoperative computed tomography (CT) scans was 44° (range, 20° to 65°). Based on the Walch classification of pathologic glenoid morphology, nine glenoids were B2 and three were type C. All patients had an intact cuff at the time of surgery. At the time of the last follow up, ten of the twelve patients had graft incorporation without any resorbtion and two had minor bone graft resorption. Broken screws occurred in two of these ten cases. Two patients, both of whom required revision surgery, had failure of fixation and of graft incorporation; one of these failures was due to early postoperative trauma and the other, to Propionibacterium acnes infection. Conclusions: The early and midterm results of total shoulder arthroplasty with autogenous bone graft demonstrated substantial clinical and radiographic improvement in most cases. Level of Evidence: Therapeutic Level IV. See Instructions for Authors for a complete description of levels of evidence.

The treatment of proximal humerus fractures (PHF) is largely surgeon dependent with no clear guidelines for selecting the optimal method of treatment. The aim of this study was to evaluate trends and variations in treatment methods of PHF in the United States from 2004 to 2012 and to determine the regional differences in treatment. The National Inpatient Sample was used to identify all patient discharges with diagnosis codes for PHF and the data were classified based on ICD-9 procedure codes. Patient and hospital demographics were also analyzed. Simple linear regression analyses were performed for each treatment modality to evaluate current treatment trends and to extrapolate the future trends of PHF treatment over the next 20 years. A national estimate of 550,116 PHF discharges was identified over the time period. Significant correlations between change over time and treatment modality were found for reverse shoulder arthroplasty (RSA) (r = 0.903, p

Low socioeconomic status and Medicaid insurance as a primary payer have been associated with major disparities in resource utilization and risk-adjusted outcomes for patients undergoing total joint arthroplasty. With the expansion of Medicaid through the Affordable Care Act in 2014, examination of these disparities has become increasingly relevant for the treatment of proximal humerus fracture (PHF).The Healthcare Cost and Utilization Project Nationwide Inpatient Sample database was used to identify patients who were treated for PHF from 2002 to 2012. Primary outcomes included treatment type, surgical fixation method, in-hospital complications, mean length of stay, and mean total charges for Medicaid patients vs. a matched privately insured cohort. In an effort to minimize confounding variables, each Medicaid patient was matched to a privately insured patient on the basis of gender, race, year of procedure, and age.Of the 678,831 patients treated with PHF, 4.9% (33,263) had Medicaid as the primary payer during the 10-year period. Medicaid patients were found to have a significantly higher risk (P .05) of postoperative in-hospital complications, including postoperative infection (odds ratio [OR], 2.00 [1.37-2.93]), wound complications (OR, 1.69 [1.04-2.75]), and acute respiratory distress syndrome (OR, 1.34 [1.15-1.59]).Medicaid patients have a significantly higher risk for certain postoperative hospital complications and consume more resources after treatment for PHFs. Additional work is needed to understand the optimal treatment type for Medicaid patients and to understand the complex interplay between socioeconomic status and outcomes to ensure appropriate resource allocation and risk stratification.

Although introduced more than 20 years ago, endoscopic carpal tunnel release (ECTR) continues to generate debate and controversy among surgeons. This review examines a single surgeon's technique for ECTR over the past 13 years to better understand the effects of a surgeon's experience on outcomes. A retrospective review was performed on a case series of 129 patients ages 25 to 89 years old who underwent an ECTR at Duke University. Ninety-six percent of patients reported improvement in nerve symptoms. There were no nerve complications in the series. The billed cost of ECTR at Duke University was 9% less than standard open release and the average return to work by report by patients was 3 weeks. Previous recommendations against ECTR have focused on increased complication rates and cost, with no reported differences in long-term clinical outcomes. The results demonstrate increased success and lower complication rates for this series of patients. This may indicate a significant correlation between a surgeon's expertise and outcomes for ECTR.