Background
Reverse total shoulder arthroplasty (rTSA) in the setting of rotator cuff arthropathy (RCA) is an elective procedure in response to a chronic and degenerative process that occurs only after thorough preoperative risk stratification and adequate patient optimization. In contrast, rTSA secondary to proximal humerus fracture (PHF) is a response to an acute traumatic injury that frequently occurs in elderly patients with underlying comorbidities such as osteoporosis. These distinct patient populations may have unique risk profiles that could influence the long-term survivorship of implants and the specific indications for revision surgery. Despite the widespread use of rTSA for both RCA and PHF, the comparative long-term outcomes, revision rates, and indications for revision between these 2 patient populations are not well established.
Methods
Patients who underwent primary rTSA were identified using Current Procedural Terminology and International Classification of Diseases codes from a national claims database and stratified into PHF and RCA cohorts. Patients were included if they had at least two years of postoperative data. These cohorts were propensity score matched by age, gender, and Charlson Comorbidity Index to control for potential confounders. The 10-year and 5-year cumulative incidence rate and risk of all-cause revision, periprosthetic fracture (PPF), periprosthetic joint infection (PJI), dislocation, and mechanical loosening were determined using Kaplan-Meier and Cox proportional hazard analyses.
Results
In total, 23,684 patients were included in this study, with 7,982 patients (33.70%) and 15,702 patients (66.30%) included in the PHF and RCA cohort, respectively. The 10-year cumulative risk for all-cause revision (hazard ratio [HR]: 1.5; P < .001), PPF (HR: 1.7; P < .001), dislocation (HR: 1.7; P < .001), and PJI (HR: 1.31; P = .001) were all significantly higher in the PHF cohort compared to the RCA cohort. Similarly, at the 5-year mark, the risk of all-cause revision (HR: 1.6; P < .001), PPF (HR: 1.6; P < .001), dislocation (HR: 1.7; P < .001), and PJI (HR: 1.3; P = .002) was also significantly higher in the PHF cohort. In contrast, mechanical loosening did not differ significantly between groups at both the 5-year and 10-year marks.
Conclusion
Over a 10-year period, patients undergoing rTSA for PHF demonstrated a higher risk of all-cause revision, PPF, dislocation, and PJI. These findings highlight the importance of counseling patients about the likely long-term outcomes following an rTSA for PHF compared to elective RCA.
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