Results of Surgical Treatment for Posterior Subluxation of the Shoulder.

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The shoulder joint is the most unstable joint in the human body. The direction of instability is mostly anterior, and posterior instability is rare. From 1979 to 1997, we operated on 16 posterior subluxation patients at our hospital. In this paper, we report the results of the surgical treatments for these patients. There were 10 males and 6 females with a mean age of 17 years (range; 13 to 29 years). The average follow-up period was 7 years 9 months (range; 4 months to 18 years 8 months). 8 patients were also associated with inferior subluxation. 1 patient had general joint laxity.In the first 4 cases, we followed Scott's original method and tightening of posterior capsule. However, due to some complications, Namely cicatricial scar and/or pain of the posterior glenoid site, the remaining 12 patients were operated on by the modified Scott's procedure. All the patients were evaluated by the shoulder evaluation score of the Japanese Orthopedic Association. The pre-operative average JOA score was 74. 8 points, which improved to 93. 8 points at the final follow-up. Recurrence was observed in 2 cases, of which had general joint laxity. All excent these two patients showed no difficulties in ADL and sports activities.From this study it can be suggested that satisfactory results can be obtained in patients with posterior subluxation by the modified Scott's method.