棘上筋から棘下筋に向かう表層線維の研究

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In the process of investigating the structure of the rotator cuff, the superficial fibers, which originated from the supraspinatus tendon and ran to the greater tuberosity beyond the infrasupinatus tendon, were observed in many specimens without rotator cuff tear. On the other hand, in the specimens with rotator cuff tears, thicker fibrous bundles, running from the supraspinatus to the posterior portion of the greater tuberosity along the posterior margin of the torn area, were observed. Thus we suspected that the superficial fibers from the supraspinatus prevent the posterior enlargement of the torn lesion and investigated the frequency and pattern of the superficial fibers. 82 shoulders of 41 adult cadavers were used in the present study. After resection of the acromion, we removed the coracohumeral ligament meticulously. In 70 specimens without rotator cuff tears, we researched the frequency and pattern of the superficial fibers of the supraspinatus tendon. In 12 specimens with rotator cuff tears, we investigated the relationship between the torn lesion and the superficial fibers. In 62 of 70 specimens without rotator cuff tear, the superficial fibers from the supraspinatus tendon running from the tendon proper to the greater tuberosity were seen. There were various patterns of attachments to the infrasupinatus tendon in those superficial fibers. In 7 specimens, those had a torn lesion located at the anterior portion of the greater tuberosity, the thick superficial fibrous bundle was observed on the posterior margin of the torn lesion. In the rest 5 specimens with a large or massive tear, we could not find the similar fibrous bundles on the posterior margin of the torn area. These results suggest that the superficial fibers from the supraspinatus tendon might prevent the posterior enlargement of the rotator cuff tears.

棘上筋から棘下筋に向かう表層線維の研究

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