Reverse Shoulder Arthroplasty: A Comparison of Concentric and Eccentric Glenospheres .
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A Comparison of Concentric and Eccentric Glenospheres in Reverse Shoulder Arthroplasty
J Bone Joint Surg Am. 2014 Aug 20;96(16):e13850 consecutive patients, who were undergoing reverse shoulder arthroplasty due to the diagnosis of cuff tear arthroplasty, were randomly assigned to either receive a concentric or an eccentic glenosphere. This study aimed to investigate whether the inferior positioning of the center of rotation with eccentric glenosphere designs decreases the adduction deficit before impingement occurs and improves clinical outcome. No difference was found in the notching rates and clinical outcomes between either group following the reverse shoulder arthroplasty procedure. Inferior glenosphere overhang greater than 3.5mm was shown to prevent scapular notching.
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