The bicipital angle of a Hill-Sachs lesion is determined. First, we draw a best-fit circle in line with the articular surface. Second, we determine the origin (most medial point of the HSL) and endpoint (most lateral point of the HSL). Third, we draw a line between the origin and endpoint. The midpoint of this line is the center. The bicipital angle for these points is the angle between the bicipital groove and these points.