Dynamic Assessment of Hip Fracture under Different Impact Configurations: An Explicit Dynamic Analysis Approach

Abstract

Dropping the hip causes stress transfer in the femur. Understanding stress transfer during dropping of the hip is very essential for the surgery .In this study, two computational models are constructed and used to simulate two hip fall scenes. We employ explicit dynamics analysis method to explore dynamic damage mechanism of hip joint, providing biomechanical basis for surgical intervention. The simulation results show that the stress continues to increase in the beginning and reach a maximum during dropping. In scene one, high stresses were presented on the femoral neck when the trochanter impacted the ground, and they were presented on the femoral trochanter when the ilium impacted the ground. The peak stresses were greater than yield point, the neck and trochanter were broken. In scene two, high stresses were presented on the femoral head when the distal femur impacted hit the ground, and they were presented on the femoral neck and shaft when the ilium rebounded from the ground. The later stresses were greater than yield point, the femoral neck and shaft were broken.