Indication for Computed Tomography Scan in Shoulder Instability: Sensitivity and Specificity of Standard Radiographs to Predict Bone Defects After Traumatic Anterior Glenohumeral Instability.

Background: Quantifying glenohumeral bone loss is key in preoperative surgical planning for a successful Bankart repair.

Hypothesis: Simple radiographs can accurately measure bone defects in cases of recurrent shoulder instability.

Study Design: Cohort study (diagnosis); Level of evidence, 2.

Measurement of combined glenoid and Hill-Sachs lesions in anterior shoulder instability.

Background: Recurrent glenohumeral anterior instability (RGAI) frequently induces combined glenoid and Hill-Sachs bone lesions and is a risk factor for soft tissue repair failure. This cohort study describes a simple preoperative quantification method for bone loss, the Clock method, the first that combines glenoid and humeral lesions.

Methods: Computed tomography scans of 34 shoulders with RGAI were twice reviewed by three independent observers, who measured bone lesions using the new Clock method and existing validated methods.