Fig. 5

a–c The situation of dynamically simulating the changes of contact position between the hook plate and large lateral acromion angle. a Take 45° α angle for example and length of hook as one unit of moment arm (MA). b The change of contact position (red dot) and fracture shift when pressing hook plate (15 mm and 90°). c The change of MA when using different hook specifications. d The contact position (red dot) and MA between the 110°-hook plate and normal lateral acromion angle