2023, Vol. 27 ›› Issue (36): 5741-5746

Establishment of lumbar-pelvic-hip finite element model and biomechanical analysis

Wen Pengfei1, Li Yaning2, Lu Yufeng1, Hao Linjie1, Wang Yakang1, Ma Tao1, Song Wei1, Zhang Yumin1   

Abstract: BACKGROUND: The increasing incidence of hip-lumbar disorders has posed a great challenge to clinical treatment and requires a well-established lumbar-pelvic-hip model to analyze its biomechanical characteristics.
OBJECTIVE: To establish a three-dimensional finite element model of the normal adult lumbar-pelvic-hip for biomechanical analysis to provide the experimental basis and reference for the study of hip and lumbar diseases and surgical treatments.
METHODS: Normal adult CT data were collected. Mimics, Geomagic, Hypermesh, and Abaqus software were used to construct a three-dimensional finite element model of the lumbar-pelvic-hip. The model was analyzed for each working condition, and the validity of the model was verified by the range of motion of the vertebral body and the stress distribution of the intervertebral disc and femoral head. The seated model was further constructed to compare the biomechanical distribution characteristics and trends between standing and sitting positions.
RESULTS AND CONCLUSION: (1) A three-dimensional finite element model of the lumbar-pelvic-hip in a normal adult was successfully established. (2) The results of the model in each working condition were within the reference range of previous literature data, which confirmed the effectiveness of the model and could be used for further experimental studies. (3) Mises stresses in the L4-L5 and L5-S1 discs showed an increasing trend after the change of posture from standing to sitting, with the most obvious change in L5-S1 disc. In terms of hip joint stress distribution, the Mises stresses were distributed in the anterior, superior, and posterior parts of the acetabulum in the standing position, while the stresses were mainly concentrated in the anterior part of the acetabulum in the sitting position.

Key words: lumbar, pelvis, hip, ligament, finite element, biomechanics, stress, digital model