Biomedical Engineering Reference
In-Depth Information
11
Pelvis Model for
Reconstruction with
Autografted Long Bones
following Hindquarter
Amputation
Wen-Xin Niu, Jiong Mei, Ting-Ting Tang,
Yubo Fan, Ming Zhang, and Ming Ni
ContentS
Summary ........................................................................................................................................ 125
11.1 Introduction .......................................................................................................................... 126
11.2 Hemipelvic Autograft Reconstruction .................................................................................. 128
11.3 Finite Element Analysis of the Intact Pelvis ......................................................................... 131
11.3.1 Finite Element Modeling and Analysis ..................................................................... 131
11.3.2 Finite Element Model Validation .............................................................................. 132
11.4 Finite Element Analysis of the Reconstructed Models ........................................................ 133
11.5 Limitations and Future Research .......................................................................................... 136
Acknowledgments .......................................................................................................................... 136
References ...................................................................................................................................... 136
Summary
It is anatomically feasible and potentially therapeutic to reconstruct a defective pelvis ring with
antogenous long bones after hemipelvic amputation, but the biomechanical characteristics of the
surgery are unclear to doctors and researchers. The objectives of this study were to analyze the stress
distribution of two hemipelvic reconstruction surgeries using the finite element (FE) method and to
find which surgery gave a more favorable outcome. An FE model of the intact pelvis was constructed
through sequenced computer tomography (CT) images and validated with an in vitro experiment.
Two operative schemes, the ischiadic tuberosity being replaced with the femur condyles or the tibial
plateau, were modeled based on the intact model. A normal sitting posture was simulated, and
von Mises stresses were calculated and compared among the three models. From a biomechanical
perspective, reconstruction with the femur condyles should be considered preferential. In planning
the operation, screws of larger than normal diameter should be used and their rigidity decreased to
reduce the incidence of stress shielding.
125
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