Stress analyses for elbow joint of growth period under Judo motion

Abstract

Injuries in elbow joints are frequently occurred in many sports, such as baseball, tennis and so on. Also in judo, many players in wide generations suffer from elbow joint injuries. Therefore, it is important to investigate the mechanism of elbow joint injures during Judo motion from mechanical aspects of view. In this study, the elbow joints of the period of growth were modelled and stress analyses were carried out to clarify the outbreak mechanism of the elbow joint obstacle. A 9-year-old bone specimens were used for modeling three-dimensional finite element models from head of humerus to the distal edge of radius and ulna. About Seoinage throw types, both forearm middle position and forearm outside rotation position were considered. For boundary conditions, caput humeri was fixed and a ulna was loaded for the forearm middle position and a radius and an ulna were loaded for the forearm outside rotation position. As a result of analyses, it is found that humeral epicondylus lateralis in the forearm rotation position was the highest for maximum principal stress. In addition, humeral medial epicondyle in the forearm rotation position was the highest for maximum shear stress.