The Journal of Bone and Joint Surgery, Vol 70, Issue 8 1174-1182, Copyright © 1988 by Journal of Bone and Joint Surgery, Inc
The Dana total shoulder arthroplasty
HC Amstutz, BJ Thomas, JM Kabo, RH Jinnah and FJ Dorey
Division of Orthopaedic Surgery, University of California, Los Angeles School of Medicine 90024.
Fifty-six Dana unconstrained total shoulder arthroplasties in forty-seven
patients were followed for a minimum of two years. The preoperative
diagnoses included osteoarthritis, rheumatoid arthritis, traumatic
arthritis, avascular necrosis, failed hemiarthroplasty, and failed total
shoulder arthroplasty of another design. For all of the patients, the
average rating for pain improved from 3 points preoperatively to 8 points
postoperatively, and the average rating for function improved from 3 to 7
points. The ranges of abduction and of external rotation improved
substantially in the shoulders that were affected by osteoarthritis,
rheumatoid arthritis, or osteonecrosis. Ten patients were treated with a
hooded glenoid component, designed to improve stability in shoulders in
which the rotator cuff is deficient. In these shoulders, both the rating
for pain and the rating for function improved, although the range of motion
did not. Complications that required revision of the arthroplasty developed
in five shoulders in which a regular component had been implanted and in
two that had a hooded glenoid component. A radiolucent line developed at
the bone-cement interface of the glenoid component in fifty-three
shoulders, but only two revisions were done for loosening of the glenoid
component.
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