Reverse total shoulder arthroplasty (RTSA) is a well-established method to treat patients with irreparable rotator cuff tears and glenohumeral osteoarthritis. The biomechanical principle implies a medialization and distalization of the center of rotation (COR). Deficiencies in internal and external rotation constitute frequently encountered functional problems. Some studies showed reduced activation of the posterior deltoid in EMG measurements, which may explain the inability to compensate these movements. Lateralized prosthetic designs demonstrated increased external rotation through an alteration of the deltoid's lever arm. The aim of the study is to investigate the impact of lateralization on functional outcome and deltoid EMG activity in comparison to a standard implantation technique.
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AI-rewrites the medical criteria so a patient or caregiver can understand them. Always confirm with the trial site.
Delta Muscle activity (especially posterior Delta part)
Timeframe: preoperative
Delta Muscle activity (especially posterior Delta part)
Timeframe: 6 weeks postoperative
Delta Muscle activity (especially posterior Delta part)
Timeframe: 3 months postoperative
Delta Muscle activity (especially posterior Delta part)
Timeframe: 6 months postoperative
Delta Muscle activity (especially posterior Delta part)
Timeframe: 1 year postoperative