Risk Factors for Rotator Cuff Tears and Aseptic Glenoid Loosening After Anatomic Total Shoulder Arthroplasty

Introduction : The purpose of this study is to retrospectively analyze all primary anatomic total shoulder arthroplasty (aTSA) patients within a multi-center international database of a single prosthesis to identify patients with rotator cuff tear (RCT) and aseptic glenoid loosening to determine the rates of these complications. Additionally, we sought to compare each of these complication cohorts to a cohort without these complications in order to identify risk factors for each complication type. Methods : aTSA patients were prospectively enrolled in a multi-center international database of a single platform shoulder system (Equinoxe; Exactech Inc, Gainesville, FL). Data was collected at 37 different clinical sites in the US and Europe using standardized forms according to an IRB approved protocol. Every patient was consented and all data was collected at each site and directly uploaded to a secure centralized IBM database. These standardized forms collected demographic data, diagnoses, comorbidities, implant size/type, pre-operative range of motion, pre-operative radiographic findings, and pre-operative clinical outcome metric scores. To investigate the risk factors for RCT and also the risk factors for aseptic glenoid loosening, we retrospectively analyzed all data from aTSA patients in this database, only excluding patients with a history of revision arthroplasty and humeral fractures. Univariate statistical analyses were conducted to compare primary aTSA patients who had report of: 1) a RCT and/or subscapularis failure and 2) aseptic glenoid loosening to a