Research of influence on brain strain index by impact location in case of baseball impact

Mild traumatic brain injuries (mTBI) occur in high-speed projectile sports due to collisions of the ball with the batter’s helmet. The purpose of this study was to examine a relationship between brain strain metrics and baseball ball impact locations. Baseball impacts simulations were carried out by using a finite element model of the head, baseball ball and helmet. From the results of the impact simulations, As the results, conventional brain strain metrics such as MPS and CSDM0.10 could not be evaluated for concussion risk during baseball impacts. On the other hand, since the cavitation pressure was reached in the baseball impact simulations, a new brain pressure metrics, Cumulative Pressure Damage Measure (CPDM) was newly defined. The results indicated that the CPDM was varied by the impact locations, indicating that this CPDM could be a new metrics of concussion risk in baseball impacts.