Figure 3: (a) The Best-fit circle was drawn along the posteroinferior glenoid margin of the left normal glenoid with diameter D and this circle was then superimposed on the affected right glenoid. The width of the bone defect along the anterior aspect of the glenoid was calculated. The glenoid track was then calculated using the formula GT = 0.84D − d, (b) The HSI was measured along the posterior aspect of the three-dimensional reconstructed right humerus; which is measured as HSI = Hill-sach's defect width (HS) + BB. Since in this case GT > HSI; it was considered an On-track lesion on Imaging, (c) Hill-Sach's angle was calculated by measuring the angle between the line drawn along the axis of the deepest portion of the Hill-Sach's lesion and another line along the axis of the shaft of the humerus. Hill-Sach's angle in this case measured 41.03°, (d) Arthroscopic Imaging of the right affected glenoid shows the presence of the bare spot which is considered to represent the centre of the glenoid; the posterior radius is measured (R) and the distance from the anterior glenoid margin to the bare spot is measured (Rx). The difference between R and Rx is measured; which is considered as the bone defect “d.” The Hill-sach's index is measured by the addition of the BB which is represented as the distance between the rotator cuff and the lateral margin of Hill-sach's lesion with the HSI. GT: Glenoid track, HSI: Hill Sach's Index, BL: Bone loss, D: Glenoid diameter, d: Defect, GT: Glenoid track, BB: Bone bridge