Fig. 3

Loading and boundary conditions of FE model. a The stress distribution in the hip joint standing one leg (J resultant hip joint force; W 5/6 body weight; F abductor muscle force = 1.6 × W). b Set reference point and build dynamic coupling device in Abaqus; The acetabular fragment and pelvis were bounded using the “tie” constraints of Abaqus. c The modeled load was applied to the reference point and the line of action of the applied force passing through the center of the head