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Operative treatment of posterior shoulder dislocations by posterior glenoidplasty, capsulorrhaphy, and infraspinatus advancement

School of Medicine in New Orleans, Louisiana State University Medical Center

David Drez, MD

Department of Orthopaedics, New Orleans, Louisiana

Posterior dislocations of the shoulder are rare, compris ing only 4% of shoulder dislocations. Several operative procedures have been described in treating recurrent dislocations, and results have been varied. A retrospec tive review of eight shoulders in eight patients treated by posterior glenoidplasty with capsulorrhaphy and in fraspinatus advancement revealed generally good re sults. Followup ranged from 10 to 114 months, with an average of 36 months. Seven patients were classified as recurrent traumatic dislocators and one as a recur rent atraumatic voluntary dislocator. Results graded as good, fair, and failure were based on pain, range of motion, return to activities, recurrence, and roentgen ograms. Six patients had good results with return to full activity, full range of motion, no pain, no recurrence, and no degenerative changes of roentgenograms. One patient, who has not returned to athletic activities and has occasional pain and limited range of motion, was graded as a fair result. The patient classified as an atraumatic voluntary dislocator has occasional feelings of instability and slight pain with strenuous activity, but has not had a recurrence and has no difficulty with activities of daily living. She was also classified as a fair result. There have been no recurrences or degenerative changes on followup radiographs. Computerized to mography performed on two patients documented a definite change in orientation of the glenoid. We feel that glenoidplasty with capsular reefing and infraspina tus advancement, if performed carefully, provides an excellent operative treatment for recurrent posterior dislocations of the shoulder.

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