Change of Pelvic Inclination Angle from Decubitus to Standing Position

Pelvis inclines to the posterior in the standing position. We investigated factors which influence the change of pelvic inclination from the decubitus to the standing position.The subjects consisted of 129 coxarthrosis hips of 79 patients. We investigated the change of pelvic inclination angle from the decubitus to the standing position and the following factors : age, sex, stage, pelvic inclination angle in the decubitus and standing positions, and Sharp angle.The change of pelvic inclination angle increased in groups with high age, posterior inclination in the decubitus and standing positions, and normal Sharp angle.We speculate that coxarthrosis in elderly patients without dysplasia is caused by increased pelvic inclination angle in the standing position.