2024 Volume 19 Issue 4 Pages 24-00114
In the fall accident on stairs, a human body receives a multiple impact on the body including on the head in a short time, as a result it often results in being unidentified which impact gives what kind of damage in the human body. However, it is important in addition to emergency treatment to know the process of the accident when brain may be injured to predict prognostic process. In this paper, the fatal accident by the fall on the stairs is analyzed, in which the cause of death was cerebral contusion, and plural damage traces were observed on a body including the head. In the first stage of the accident analysis, possible fall motions are reproduced repeatedly based on multibody dynamics, and the fall motion that the physical damage trace fitted the reported position of the blow is chosen from them. In the next stage, finite element analyses are performed in which the initial condition in a posture and the initial velocity for each impact obtained from the fall motion are given as initial condition, and the possibility of the head injuries are evaluated. The analysis results indicates that in the case, there is a high likelihood of falling during descending the stairs, followed by sliding down with rotation. During this sequence, the head experiences three impacts, each impact indicated the potential for causing specific types of injuries.
