抄録
The purpose of this study was to determine the relationship between the glenoid osteophytes and superior translation of the humeral head during arm elevation in shoulders with rotator cuff tears. The inferior margin of the glenoid was observed on A-P x-rays of 52 shoulders (14 normal controls,9 partialthickness tears and 27 full-thickness tears), and the incidence and shapes of the osteophyte were examined. Next, A-P x-rays with the arm at 0°and 45°of abduction in the scapular plane were taken. The superior translation of the humeral heads were measured by digitizing the reference points. Hooktype osteophytes were observed more in shoulders with full-thickness tears than in the other groups. There were no significant differences in the superior translation of the humeral heads among the three groups. The superior translation in shoulders with hook type osteophytes was significantly larger than those with sharpening-type and elongation-type osteophyes (p<0.05). The superior translation of the humeral head observed in shoulders with rotator cuff tears seems to be related to be formation of hook-type osteophytes at the inferior portion of the glenoid.
