Fig. 2.
Examples of linear methods for measuring glenoid bone loss. In the Griffith Index (upper two images), the ratio of glenoid length:glenoid width is less in the injured glenoid C:A when compared to the uninjured glenoid B:A. In the Cheung glenoid index, a circle of best-fit on the uninjured glenoid is used as a reference for the AP width