Biomechanical Research On Metatarsal Athletic Injury And Funtion Of Sports Shoe's Forefoot

With the increase of the difficulty and intensity on competitive movement, the rate of sport injury will become very frequency in training and competing. The metatarsal is one of the most frequently injured foot in the human body. The incidence of metatarsal injuries is rising during recently years. If swift-running, racing, jumping such as common action are incompatible with the priciples of biomechanics,causing "foot-shoes" and "shoes-land" inerface changes, foot may be occurred injury. Sports shoes can prevent and protect the feet joints and organizations, from accidental injury. They have been concerned by sport shoes manufacturers and biomechanics researchers. Through comparison of foot biomechanical characteristic under two kinds of sports shoes and landing methods, conclusions of the relationship between varus angle and foot pressure distribution, the effect of different sneakers on foot pressure distribution are found in order to determine local peak pressure, maximum force and force-time-integral. The purpose is to provide the reliable correlative theoretical basis for improving sport equipments and security protection recommendations for people to engage in sports.Pedar-X plantar pressure measure system and Novel emed pressure distribution measure plate were used in order to get the dynamics data in normal landing and inverted landing. Take different varus angle(5°~15°) as conditions of supporting. Height between heel and land was 5cm. Three kinds of external forces(100N,150N, 200N) applied to Novel emed pressure distribution measure plate. From pressure changes of forefoot, metatarsal peak stress had been transferred from the first metatarsal to the fifth metatarsal, with increasing of varus angle. When the foot was inverted state, stress distribution of metatarsal changed significantly. Lateral metatarsal played a major role in supporting. Through calculation, human metatarsal data was acquired.The research concluded that: sports shoes could effectively reduce the reaction of the land. Forefoot of different functional sports shoes had significantly changes of pressure. When human forefoot inversion after a jump, the fifth metatarsal played a major role of supporting. Varus angle and external force influenced distribution of pressure. They led to foot injury that varus angle and external force were significant facters.