Abstract
The purpose of this study is to discuss the risk of the ball heading technique in football using finite element analysis. A high intensity stress is observed on the contact face (frontal skull) and the neck (1st and 2nd cervical vertebra). The stress on the contact face was about 2.0 MPa at 3 ms after impact. The Head Injury Criteria (HIC) value in the case of 100% (base model) was 8.2,and that in the case of 50% was 66.3 These results suggest that there is a low head injury risk during ball heading (single impact) on the boundary conditions in this study. This HIC is concerned with the only a head injury from a single impact, therefore, it is necessary to investigate a neck injuries such as cranial whiplashes. In the case of a single impact, it seems that the players should prevent retinal hemorrhage and retinal detachment by direct grove (eye) impact. Furthermore, it is considered that the tolerance to repeatable impacts may be quite different from that of a single impact. The effect of repeatable stress head injuries for football players is one of the most important subjects for a future study.
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