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Introduction The concept of the critical shoulder angle (CSA) was introduced in 2013 with studies showing larger CSA is associated with rotator cuff tears (RCT) and smaller CSA with glenohumeral osteoarthritis. However, there is limited data on the impact of CSA, if any, on total shoulder arthroplasty (TSA) outcomes. Methods We conducted a matched case-control study using a shoulder arthroplasty registry from a US integrated healthcare system to identify patients who underwent primary elective anatomic TSA for the diagnosis of osteoarthritis from 2009-2018. 78 adult patients who underwent revision following the primary TSA due to glenoid component failure or rotator cuff tear comprised the case group. A control group of non-revised patients were identified from the same source population. Two controls were matched to each case by age, gender, body mass index, American Society of Anesthesiologists classification, surgeon who performed the index TSA, and post-TSA follow-up time. The relationships between revision and CSA as measured on radiographs were analyzed as a 1:2 matched-pairs case-control study with use of multiple conditional multivariable logistic regression. Results Revised cases had a higher likelihood of a CSA ≥35° (odds ratio [OR]=2.41, 95% confidence interval [CI]=1.27-4.59). A higher likelihood of CSA ≥35° was observed for those revised for glenoid loosening (OR=4.58, 95% CI=1.20-17.50) and revised for rotator cuff tear (OR= 2.41, 95% CI=1.18-4.92) compared to non-revised controls. Every 5° increase in CSA had higher odds of overall revision (OR=1.62, 95% CI=1.18-2.21), glenoid loosening (OR=2.50, 95% CI=1.27-4.92), and rotator cuff tear (OR=1.51, 95% CI=1.07-2.14). Conclusions In a matched case-control study of primary anatomic TSA, individuals who were revised for aseptic glenoid loosening and superior cuff failure had a higher CSA compared to non-revised individuals. These data suggest that surgeons may consider utilizing reverse arthroplasty in cases of primary shoulder arthritis with a CSA of 35° or greater.

Purpose Obesity has been associated with increased perioperative complications following shoulder arthroplasty, though this finding has not been consistently reported. The purpose of this systematic review is to summarize the correlation between elevated body mass index (BMI) and the prevalence of perioperative complications and clinical outcomes following anatomic total shoulder arthroplasty (aTSA). Methods An extensive literature search of PubMed, Embase, ScienceDirect, and Google Scholar was conducted up until October 2020. Clinical studies that specifically examined the association between BMI and/or various categories of obesity with perioperative complications and functional outcomes following aTSA were included. Public databases (NIS, ACS-NSQIP, PearlDiver, and statewide databases) were largely excluded from the analysis unless procedural codes allowed for differentiation between reverse total shoulder arthroplasty (rTSA) and aTSA. Results Eleven studies were included in this systematic review - 9 studies reported solely on perioperative complications, 1 study solely on functional outcomes, and 1 study on both complications and outcomes following aTSA. Seven papers had a MINORS (Methodological Index for Non-Randomized Studies) score of Discussion Increasing BMI was not found to be associated with an elevated risk for the majority of perioperative complications following aTSA. Range of motion and patient reported functional outcomes can be expected to improve, even amongst morbidly obese patients. Level of Evidence Level IV; Review Article

BACKGROUND: The critical shoulder angle (CSA) has been associated with full-thickness rotator cuff tears both in the presence and absence of glenohumeral arthritis. It is unclear whether the CSA can be reliably measured from plain radiographs of concentric glenohumeral osteoarthritis amongst examiners at differing levels of training. METHODS: We retrospectively reviewed the radiographs of consecutive patients who underwent shoulder arthroplasty for glenohumeral osteoarthritis. The CSA was measured on a standardized AP scapular view at baseline and then 4 weeks later by fellowship-trained orthopaedic surgeons, a shoulder fellow and a senior orthopaedic resident. Grade of arthritis was categorized using the Samilson and Prieto method. The inter- and intra-observer reliability was then determined for all examiners, as well as for increasing severity of radiographic arthritis. The relationship between the CSA and grade of arthritis was assessed. RESULTS: There were 166 included patients comprised of 104 females (63%) and 62 males (37%) with a mean age of 65.9 ± 10.4 years. The inter- and intra-observer reliability for measuring the CSA amongst all examiners was found to be excellent, with an intra-class coefficient (ICC) of >0.9 (p

INTRODUCTION Plain radiographs of the shoulder are routinely obtained for patients presenting with atraumatic shoulder pain, although the diagnostic utility of this imaging modality is unclear. Despite this, patients often prefer to obtain radiographs and may associate them with a more satisfactory visit. METHODS New patients presenting with atraumatic shoulder pain were provided with information regarding the potential advantages and disadvantages of plain radiographs as part of their visit. Patients then decided whether to receive radiographs and baseline patient demographics were collected. A detailed physical examination and history was performed by a fellowship-trained provider, and a preliminary diagnosis and tentative treatment plan was formulated. The radiographs were then reviewed to determine whether the diagnosis and treatment plan was altered by addition of the radiographs. Patients who opted for radiographs then reported whether they felt the radiographs aided in diagnosis and treatment and whether the addition of the radiograph influenced their visit satisfaction. RESULTS A total of 220 patients met the inclusion criteria. Overall, 121 patients (55%) requested a radiograph. The mean age was 57.1 ± 16.1 years (range, 18 to 91 years). Lack of bachelor's degree (odds ratio [OR], 2.8; 95% confidence interval [CI], 1.2 to 6.2; P = 0.01), lack of previous contralateral shoulder pain (OR, 4.0; 95% CI, 2.0 to 8.2; P = 0.0001), and lack of a previous shoulder radiograph (OR, 8.4; 95% CI, 4.1 to 16.9; P < 0.0001) or MRI within the last 6 months (OR, 6.2; 95% CI, 1.4 to 26.8; P = 0.01) were independently associated with patient preference to obtain radiographs for atraumatic shoulder pain. Of the 121 patients who requested radiographs, 117 (96.7%) felt that radiographs improved their satisfaction. DISCUSSION Patients who obtained radiographs overwhelmingly reported its importance in improving visit satisfaction and diagnostic accuracy. Given the increasing emphasis on shared decision making, further study of patient factors influencing the decision to obtain routine radiographs will lead to more efficient practice management and potentially improved patient satisfaction. LEVEL OF EVIDENCE Level II (Diagnostic).

Total shoulder arthroplasty has gained remarkable popularity in the last few decades. Critical review of outcomes and large registries in different countries have led to newer designs and expanding indications, which have resulted in rapid growth around the world. Despite numerous advances in surgical techniques and implant designs, however, complications still occur, and with an active aging population and increasing popularity among upper extremity surgeons, we can expect those complications to increase both in volume and complexity. Recognition and timely diagnosis of adverse outcomes can help surgeons not only correct and salvage a poor outcome but understanding what leads to common complications may also help us to anticipate and avoid them altogether. Infection, component loosening, periprosthetic fracture, and instability are the major reasons for revision surgery. Though the diagnosis may be difficult, as many signs and symptoms may be subtle and nonspecific, a careful history and physical examination, critical review of radiographs, and a healthy level of suspicion may offer clues and guide the surgeon toward advanced imaging, laboratory studies, and other diagnostic measures. This chapter aims to provide the reader with the tools to successfully identify those patients who may need further surgical treatment in the setting of a total shoulder arthroplasty as well as to help avoid common pitfalls implicated in certain complications.