Maine Orthopaedic Review Monthly Challenge

Test Your Knowledge of Treating Sports Injuries

Bruce F. Gomberg, MD; Kenneth R. Morse, MD


May 12, 2017

The native shoulder relies on the rotator cuff to actively stabilize the glenohumeral joint by compressing the humeral head against the glenoid. Loss of the rotator cuff can cause the humeral head to translate superiorly under the pull of the deltoid. In the case of the reverse total shoulder arthroplasty, the center of rotation is translated medially. This change in the center of rotation results in a greater recruitment of the deltoid as an abductor by increasing the abductor moment arms of anterior, middle, and posterior deltoid.[1,2]


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