Reverse shoulder arthroplasty: The Singapore General Hospital experience and a simple method of measuring change in the center-of-rotation.

Ang, Chay-You; Lai, Kah-Weng; Tjiauw Tjoen, Denny Lie; Chang Chee Cheng, Paul · J Orthop · 2015

case_series · Level IV

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Abstract

This study reviews the outcomes of reverse shoulder arthroplasty (RSA) and introduces a novel method of measuring changes in the center-of-rotation (COR) of the shoulder joint post-operatively. We performed 10 reverse shoulders in 2011. Patients were evaluated pre-operatively and post-operatively using the Constant Score. The COR of the shoulder was determined pre- and post-operatively on radiographs and the differences were analysed. There was significant improvement in Constant Scores post-operatively with reduction in pain and increase in strength. Medialisation but not distalisation of the COR was achieved. Longer follow-up studies and studies on survivalship are required.

Anatomy