抄録
This study was intended to investigate characteristics of recurrent anterior subluxation or dislocation of the shoulder with a partial thickness tear of the rotator cuff. We reviewed patients' pre-surgery medical histories and clinical results. We studied 81 shoulders of 81 consecutive patients who had undergone surgery for recurrent anterior subluxation or dislocation of the shoulder. Of 81 shoulders, 25 were diagnosed preoperatively using arthrography and MRI as partial thickness tears of the rotator cuff. We divided the cases into two groups according to whether the partial thickness cuff tear was complicated or not. The differences between the two groups were tested for statistical significance about age at surgery, sexuality, dominant side, duration from trauma to surgery, the number of dislocation, whether dislocation of subluxation, the size of Hill-Sachs lesion and Bankert lesion, the score of clinical results, and muscle strength after surgery using BIODEX. Cases with partial thickness tears had a significantly more frequent history of dislocation compared to other cases ( p <0.05). Furthermore, cases with partial thickness tear had significantly larger Hill-Sachs lesion than other cases ( p <0.05). The muscle strength of extension at 6 months after surgery was significantly less in cases with partial thickness tears, but no significant difference was found 1 year after surgery. Remaining factors showed no significant differences between groups. For a safe return to sports activities, attention must be given to reduced muscle strength at 6 months after surgery in cases with partial cuff tears.
