An anatomic study of glenoid regarding anchor insertion posion and direction

To investigate normal bony anatomy of the glenoid rim, to measure inner glenoid rim angle and outer glenoid rim angle, and the angles for successful anchor insertion for arthroscopic labral repairs. Twelve unpaired isolated human glenoids (6 right, 6 left) without any evidence of trauma were for studying. The glenoid specimens were scanned using 320-slice CT (Aquilion ONE), then reconstruction glenoid to a three dimensional model using materialise's interactive medical image control system (Mimics) and to obtain cross-sectional images in 6 different planes, mark the right glenoid rim with clockwise tag, the left with counterclockwise tag. Inner glenoid rim angle marked as angle α and outer glenoid rim angle marked as angle β were measured from the cross-sectional images of the glenoids at 8 positions: 2-, 3-, 4-, 5-, 6-, 7-, 8- and 9-o'clock positions. Glenoid morphology was noted for each position. Using 12 mm as radius, measured the minimum insertion angle of anchor, marked as angle γ. Normal distribution o