Predictive Value and Clinical Validation of the On-Track vs. Off-Track Concept in Bipolar Bone Loss in Anterior Glenohumeral Instability

摘要

Objectives:Bone loss is a well-described risk factor for failure with arthroscopic stabilization. The isolated importance of bone loss on both the glenoid and humeral side has been increasingly studied. A more recent evolution considers how both the glenoid and humeral bone loss interact to determine whether their combination results in an “on-track” or “off-track” lesion, which may be more predictive of recurrent instability than looking at either side individually. While the biomechanics of this concept have been elucidated, no study has tested this theory in a clinical population. The purpose of this study is to compare a series of arthroscopic Bankart reconstructions stratified by whether they are “on-track” or “off-track” with regard to bipolar bone loss and to compare their rates of recurrence and functional outcome scores.