Traumatic posterior (sub) luxation of the shoulder is not well understood because it is an uncommon condition. This disease may be classified into two groups: habitual and voluntary. We treated six cases of the habitual (sub) luxation, who had no history of trauma initiating the (sub) luxation. Diagnosis was made by clinical observations and radiographs. The routine radiographs and arthrograms showed no abnomalities. Stress radiographs were made and these demonstrated posterior (sub) luxation. The operative procedure consisted of posterior glenoid osteotomy and capsulorraphy. Five shoulders that were followed up for one year or more after the operation were graded excellent.
