The Establishment And Validation Of Three-dimension Finite Element Model Of Shoulder And Application To Mechanism Investigation Of Humerus Fracture

Background: Shoulder joint is charactered by the widest motion extension , themost components, the most complex kinematics among the all joints of human. Generally speaking, shoulder is composed of scapula, humerus, clavicle ,sternum, capsule, ligament , muscle ,tendon ,and other tissues, so it is called as shoulder complex ,as well. Because of the poor bone incongruity between head of humerus and glenoid, soft tissue plays an important part in maintaining stability and biomechanics of shoulder joint. At present, biomechanical research of shoulder joint is limited to experimental test ,which is carried out in vitro, thus , many mechanical conditions in vivo are eliminated , and biomechanical behavior in vivo of bone and soft tissues of shoulder joint can not been simulated .So experimental study of shoulder has some shortage obviously. Therefore, a new study method of shoulder biomechanics is needed to reproduce accurately material trait of skeleton and soft tissues of shoulder complex, lose the least in vivo information, and alter direction ,magnitude and quantity of loading in need of reality to anaylze different stress and strain situation of shoulder joint, explore possible injury mechanism of bone failure, and even help to implant reasonably internal fixation material. This method , also called theoretically biomechanical analysis, will be an ideal research technique and a powerful supplement for experimental biomechanics. In so consideration, this study was performed as a kind of exploration.Objective: The aim of this study is to establish an intact three-dimension finiteelement model of shoulder joint, which is composed of humerus, clavicle, scapula, and soft tissues made up of three-dimension linkage element, and provide an fundational and general tool to further study biomechnics of shoulder joint. As a parallel study of finite element model, the stress and strain of labrum and humerus at different functional positions are measured systematically and experimentally, veracity and validation is validated. The final purpose of the study is to take advantage of this three-dimension finite element model of shoulder to simulate the process of humerus fracture and investigate injury mechanism and mechanical...