Biomechanical validation of computer assisted planning of periacetabular osteotomy: A preliminary study based on finite element analysis.
Periacetabular Osteotomy (PAO) is a joint preserving surgical intervention intended to increase femoral head coverage and thereby to improve stability in young patients with hip dysplasia. Previously, we developed a CT-based, computer-assisted program for PAO diagnosis and planning, which allows for quantifying the 3D acetabular morphology with parameters such as acetabular version, inclination, lateral center edge (LCE) angle and femoral head coverage ratio (CO). In order to verify the hypothesis that our morphology-based planning strategy can improve biomechanical characteristics of dysplastic hips, we developed a 3D finite element model based on patient-specific geometry to predict cartilage contact stress change before and after morphology-based planning. Our experimental results demonstrated that the morphology-based planning strategy could reduce cartilage contact pressures and at the same time increase contact areas. In conclusion, our computer-assisted system is an efficient tool for PAO planning.
Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland.
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L
Liu
Orthopaedic Department, Inselspital, University of Bern, Bern, Switzerland.
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T
Ecker
Med-X Research Institute, Shanghai Jiao Tong University, Shanghai, China.
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L
Xie
Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland.
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S
Schumann
Orthopaedic Department, Inselspital, University of Bern, Bern, Switzerland.
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K
Siebenrock
Institute for Surgical Technology and Biomechanics, University of Bern, Bern, Switzerland. Electronic address: guoyan.zheng@istb.unibe.ch.
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G
Zheng
D000077:Acetabulum / Q000601:surgery*; D001696:Biomechanical Phenomena; D020342:Finite Element Analysis; D006617:Hip Dislocation / Q000601:surgery; D006801:Humans; D055595:Mechanical Phenomena; D010027:Osteotomy / Q000379:methods*; D025321:Surgery, Computer-Assisted / Q000379:methods*
Computer-assisted diagnosis and planning; Finite element analysis; Hip joint morphology; Periacetabular Osteotomy