Application of MRI-based Finite Element Modeling and Analysis in Periacetabular Osteotomy

doi:10.11938/cjmr20233058

Abstract

Abstract:

Periacetabular osteotomy (PAO) is a surgical procedure to correct acetabular orientation in developmental dysplasia of the hip (DDH). In this work, magnetic resonance imaging-based finite element models of hip joint were introduced to perform virtual surgery planning for patients with DDH. The optimal position of acetabulum following PAO was determined by analyzing the peak contact pressure and contact area between the femoral and pelvic cartilage when the acetabulum rotated from the original center edge (CE) angle in increments of 5°. Furthermore, with finite element analysis, we simulated joint movements in both the preoperative model and the planned model with the optimal position for the six cases. A comparison between the preoperative and planned models for all scenarios was made. The outcomes of finite element analysis revealed that the optimal position of acetabulum was at a CE angle of 20°. In all evaluated scenarios, the planned model showed lower peak contact pressure and larger contact area than the preoperative model did. The efficacy of virtual surgery planning was thus validated from a biomechanical perspective.

Key words: magnetic resonance imaging, finite element analysis, developmental dysplasia of the hip, periacetabular osteotomy, virtual surgical planning

CLC Number:

O482.53

ZHOU Tianli, ZHANG Dian, WU Jizhi, JIA Huihui, CHANG Yan, SHENG Mao, YANG Xiaodong. Application of MRI-based Finite Element Modeling and Analysis in Periacetabular Osteotomy[J]. Chinese Journal of Magnetic Resonance, 2023, 40(4): 397-409.

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部件	单元类型	杨氏模量/MPa	泊松比
皮质骨	四面体	17000	0.3
松质骨	四面体	70	0.2
软骨	四面体	15	0.45

韧带	韧带刚度/（N/mm）	数量	弹簧刚度/（N/mm）
圆韧带	68	1	68
坐股韧带	39.6	10	3.96
耻股韧带	36.9	6	6.15
髂股下韧带	100.7	4	25.175
髂股上韧带	97.8	4	24.375

网格尺寸/mm	网格数量	峰值接触压力/MPa	变化率/%	接触面积/mm2	变化率/%
1	52564	11.783	-	227.836	-
0.7	113422	12.446	5.627	219.494	3.661
0.5	257067	12.484	0.305	216.635	1.303