腱板断裂患者における腱板筋の病理組織像と腱板修復術術後成績
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<B>Background:</B> It is unclear whether pathological fatty infiltration in torn rotator cuff muscles affects the postoperative outcome of the rotator cuff repair. The purpose of this study is to clarify the relationship between pathological findings associated with torn rotator cuff muscles and postoperative outcome at one year after the operation.<BR><B>Methods:</B> 36 shoulders in 34 patients with rotator cuff tears, were treated with cuff repair in our hospital. 25 were males, and 11 were females. Pathological Fatty infiltration between muscle fibers was graded 0 to 2. We defined 0 was negative for fatty infiltration (-), 1 and 2 were positive (+). Postoperative abduction and external rotation strength was examined with a microFET<SUP>TM</SUP>, and compared with preoperative strength. Postoperative results were evaluated with JOAscore. Re-tear of the cuff in MRI was evaluated by the Sugaya's classification. Type IV and V were defined re-tear (+). We analyzed the relationship between pathological fatty infiltration in the supraspinatus and infraspinatus, and JOA score, muscle strength, and re-tear.<BR><B>Results:</B> There was no relationship statistically in the supraspinatus and infraspinatus, between fatty infiltration and JOA score. There was no relationship statistically between fatty infiltration and muscle strength too. At the supraspinatus, there were 6 re-tears in fatty infiltration (+) group, and none in (-) group, and there was significant difference (P = 0.043). At the infraspinatus there was no difference.<BR><B>Conclusion:</B> If there is no pathological fatty infiltration in the supraspinatus before operation, re-tear after the operation is unlikely to occur.
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