Fig. 1From: The combined utilization of predictors seems more suitable to diagnose and predict rotator cuff tearsThe coordinate system based on scapula. The center of the best-fit circle of the inferior glenoid (O) was as the origin. The line from O to SM was set as Z-axis (blue). The plane determined by O, SM and SI was regarded as YZ plane. X-axis (red) was perpendicular to the YZ plane and Y-axis (yellow) was perpendicular to the XZ planeBack to article page