Sagittal MPR of CT arthrogram showing a quantification method for the antero-inferior glenoid bone loss in typical bony Bankart lesion (arrows). A best fit circle (red) is projected on the inferior rim of the glenoid. The width of the bone missing anteriorly (full yellow line) is divided by the diameter of the circle (dashed yellow line). A typical threshold of 20–30 percent typically indicates a glenoid augmentation procedure.