Mechanical tests are indispensable for the reseach and development of fracture-protective devices on sports activities such as bicycle race "KEIRIN". It is ideal to fresh human cadaver bones even for in vivo experiments. However, the accessibility to the fresh human bone is unfortunately limited, so that alternative materials have been investigated. We have recently developed synthetic tibia and femur composite models made from polyurethane resin (HIPROX) and reported their excellent applicability for the evaluation of fracture fixa-tion devices.
　In this study, the applicability of this synthetic clavicle model, the reason why claviclar bones had the most frequent fractures of bicycle racers, was investigated comparing the mechanical properties among the other synthetic models and the fresh human bones.
　When the models were designed to simulate the clavicle bone with solid HIPROX resin, the mechanical properties can be fairly approximate to those of the fresh human bones. It was concluded that this polymeric resin model can be well used for preliminary mechanical testing of fracture-protective devices.

DESCENTE SPORTS SCIENCE Vol.13/THE DESCENTE AND ISHIMOTO MEMORIAL FOUNDATION FOR THE PROMOTION SPORTS SCIENCE