We evaluated twelve shoulders (ten patients) that had recurrent, painful
posterior instability and were treated by external rotational osteotomy of
the humerus. The length of follow-up ranged from two to twelve years. The
patients rated the result as excellent or good in ten of the twelve
shoulders. Objectively, two shoulders were rated as excellent; eight, as
good; and two, as fair. There was recurrent instability in one shoulder
that had had multidirectional instability. One pseudarthrosis, which
persisted for ten years, was revealed on the follow-up radiographs.