Histopathologic Changes at the Rotator Interval Region

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  • 腱板疎部領域の病理組織所見と肩の病態との関連

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The aim of this study was to examine the histopathologic changes of the rotator interval (RI) region in cases of frozen shoulder (FS), RI lesion, and other shoulder diseases. Twenty-five RI tissues were obtained from 25shoulders during surgery. There were 5 recurrent dislocations of the shoulder,10 Type II RI lesions,2 Type I RI lesions,5 FS and 2 rotator cuff tear cases. A biopsy was taken of the coracohumeral ligament (CHL) and the capsule of the RI. All specimens were examined histochemically and immunohistochemically. The surgical findings in cases with FS showed that the CHL was contracted and coalesced with the supraspinatus tendon and the RI was replaced by a scar-like tissue. Histopathologic examinations of the CHL and scar-like tissue in FS revealed fibrosis with an active myofibroblastic proliferation. No remarkable inflammatory reaction was observed. The tissues from an RI lesion and other cases without contracture demonstrated mild synovial proliferation with reactive vascular proliferation. The difference of the reactivity of the myofibroblast against the microtrauma in the RI region might result in contracture or instability of the shoulder.

Journal

  • Katakansetsu

    Katakansetsu 29 (3), 491-495, 2005

    Japan Shoulder Society

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