Open MRIによるapprehension肢位でのBristow変法の評価

抄録

[Purpose] The purpose of this study was to evaluate the effects of a modified Bristow procedure in the apprehension test position with open MRI.
[Materials and methods] A 31-year-old man had undergone a modified Bristow procedure for recurrent anterior dislocation of the shoulder 6 years ago. MRI was performed with an open MRI (Signa Ovation, GE, U.S.A.) in the apprehension test position with the shoulder in 90° of abduction and 60° of external rotation. Then stable shoulders in eight patients and five shoulders in five patients were scanned too. Then the stability of the shoulder was evaluated in the transverse image.
[Results] The transported coracoid process and conjoined tendon were scanned clearly in the axial and coronal images. The humeral head pressed upon the conjoined tendon and the course of the conjoined tendon was an antero-inferior arc curve. The conjoined tendon prevented the humeral head from anterior dislocation. The gleno-humeral joint was stable.
[Conclusion] This study suggests that the conjoined tendon plays an important role in preventing anterior dislocation of the shoulder.