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Reverse shoulder arthroplasty (RSA) is a reliable, long-term treatment option for degenerative shoulder pathology. However, the functional outcomes degrade around the fifth year postoperation, particularly for internal and external rotation. Long-term radiographic changes have been reported around the humeral stem, depending on the fixation method. The primary objective was to compare the clinical outcomes of RSAs by fixation method-cemented vs. press-fit-after a minimum follow-up of 5 years. We hypothesized that proximal humeral osteolysis impacts the func