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(a) Glenoid track (GT) formula where D = diameter of the inferior glenoid and d = the width of the anterior glenoid bone loss. (b) Hill-Sachs interval (HSI) formula, the sum of the width of the HS lesion and the width of the bone bridge between the rotator cuff attachments and the lateral aspect of the HS lesion. If HSI > GT, the HS is off-track or engaging. If HSI < GT, the HS is on track, or non-engaging
