Analysis of the structural behavior of the pelvis during lateral impact using the finite element method

In this study, three-dimensional finite element models were created from computer tomography data to study lateral impact fractures of the pelvis. The models reflect the complex geometry and material properties of the pelvis. The models were compared to published experimental results for validation. Dynamic analyses of the pelvic structure were performed for different peak forces in the range of 5520 to 15550 N to correspond to the velocities and impulses of real world accidents. The locations of structurally significant regions of the pelvis were identified based upon the stress distribution and upon the energy stored by the pelvis to failure. The impact force which induced fracture of the pelvic bone was 8610 N. The region which failed first in left lateral impact was the right pubic ramus. The fracture pattern was a variant of the lateral compression pelvic injury. The results suggest that the anterior structures of the pelvis are the most sensitive regions. The energy absorbed by the pelvis prior to failure was 8.98 J. The finite element method may be used to determine the strength and energy-absorbing capability of the pelvis for lateral impact loading.