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Department of Surgery, Center for Health Sciences, Los Angeles, CA 90024.
Forty-two Designed After Natural Anatomy (DANA) total shoulder arthroplasties (Howmedica, Rutherford, New Jersey) were performed in 34 rheumatoid patients. Thirty shoulders in 23 patients were followed for a minimum of two years. Twelve of the 30 shoulders (40%) had significant rotator cuff tears. The average rating for pain improved from 3 points preoperatively to 8 points postoperatively for the overall group, and the average rating for function improved from 3 points preoperatively to 6 points postoperatively. Range of motion (ROM) improved substantially in patients treated with a regular glenoid component. Four patients were treated with hooded glenoid components designed to improve stability for shoulders in which the rotator cuff was deficient. In the rotator-cuff-deficient patients, pain and function improved; however, ROM was unchanged. Complications, including one acromial fracture and two loose glenoid components, required revision surgery.
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