Arthroscopic posterior bone block: surgical technique.

Posterior glenohumeral instability remains a difficult problem. There are still many controversies regarding surgical treatment, due to a lack of understanding the pathomechanical issues leading to posterior instability. This article presents a new arthroscopic technique of posterior bone block augmentation, which we found to be effective, repeatable and successful. This technique can be used for combined soft tissue and bony defects as well as for revisions after previous soft tissue reconstructions.