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less than 10%
24%
355/1451
10 to 20%
11%
157/1451
20 to 30%
19%
271/1451
30 to 40%
18%
261/1451
greater than 40%
27%
396/1451
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Full-thickness supraspinatus tears have been historically rare in patients with primary shoulder osteoarthritis, with most studies showing a rate of < 10%. While numerous imaging studies in asymptomatic individuals have demonstrated a high prevelance of rotator cuff tears (30-55%) in individuals over the age of 60, this has not been the case with those patients presenting with primary shoulder osteoarthritis. This excludes patients with rotator cuff tear arthropathy, who by definition have a cuff tear and do not have "primary osteoarthritis". Norris and Iannotti noted 9% of their osteoarthritic patients presenting for arthroplasty had full-thickness supraspinatus tears. Edwards et al cited 42/514 (8%) of their osteoarthritic patients had a full-thickness supraspinatus tear. Please note that these numbers refer to full thickness tears of the supraspinatus in patents with primary osteoarthritis who are symptomatic as they are presenting for arthroplasty.
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