Summary

Bone defects on the glenoid or humeral side are a primary reason for failure following instability surgery [Burkhart SS, De Beer JF. Arthroscopy 2000; Bollier MJ, Arciero R. Sports Med Arthrosc 2010]. The critical level for bone loss at the glenoid or humeral head as a risk factor following instability surgery is historically considered to be 20% to 25% and 25%, respectively. However, much of these data are derived from cadavers with isolated lesions, whereas in clinical practice, concomitant defects of the glenoid and humeral head occur in 89% to 100% of patients with instability.