Fatty degeneration of the infraspinatus adversely affects shoulder-specific outcome parameters in shoulder arthroplasty used to treat primary osteoarthritis.
Fatty degeneration of the subscapularis also adversely affects outcomes but to a lesser degree, say French and United States researchers.
They studied 555 shoulders in 514 patients undergoing shoulder arthroplasty for primary glenohumeral osteoarthritis. Investigators from centres in Lyon, Nice and Strasbourg, France, and in Minneapolis, Minnesota, United States, found, however, that minimally retracted or non-retracted rotator cuff tears limited to the supraspinatus tendon did not appreciably affect arthroplasty outcome parameters. In the study, 41 treated shoulders had a partial-thickness tear of the supraspinatus while 42 had a full-thickness tear.
There was moderate (stage 2) fatty degeneration of the infraspinatus in 90 shoulders and severe degeneration (stage 3 or stage 4) in 19 shoulders. Another 84 shoulders showed moderate fatty degeneration of the subscapularis tendon; 15 had severe degeneration.
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