ABSTRACT
Han Jiangbo. Department of Theoretical Mechanics, Luoyang Industry College. Luoyang Since January 1982 we have relocated the insertion of a part of pectoralis major or deltoid muscle in the treatment of 5 cases of habitual dislocation of shoulder. After over a year of follow-up no recurrence of dislocation has been found in all the cases. The shoulder joint seemed to be stable, the range of movements increased, and disturbance in supination was corrected. The operative procedure was studied in fresh cadavers and human skeleton. Studies on mechanical model of shoulder joint, with theoretical calculation of changes in pronation after muscle displacement, showed that movements of pronation were remarkably increased after displacement of partial pectoralis major and deltoideus. It could also compensate the weatened subscapularis.