Fig. 3

Vertex tag humerus head model, the measurement on the humerus is apart from the surface distance, the distance from the surface of the humeral capitellum and humerus inner Angle, on the basis of anatomical data from measuring mark edge of acromion of depth from the top spin before the brachial artery, humerus head point distance from top spin before the brachial artery, edge of acromion axillary nerves on edge distance, and humerus head point distance from the superior border of axillary nerve