Finite Element Analysis of Decompression Effect of Custom Additively Manufactured Knee Orthosis Compartments

doi:10.16183/j.cnki.jsjtu.2022.194

Abstract

Abstract:

To simulate the biomechanical changes of knee joint before and after wearing the orthosis in patients with knee osteoarthritis (KOA) by constructing a finite element model of the knee joint and a customized additively manufactured knee orthosis, so as to verify the decompression effect of the orthosis, and aimed at orthopaedics, a quantitative research on the therapeutic effect of knee orthosis was conducted to evaluate the clinical efficacy of knee orthosis.This experiment was approved by the Ethics Committee of the Ninth People’s Hospital Affiliated to Shanghai Jiao Tong University School of Medicine. A woman with knee osteoarthritis was recruited, and the knee joint was subjected to optical body surface and CT scans. A custom-made additively manufactured knee orthosis was designed according to the principle of unilateral decompression. After boundary setting and other steps, software such as ANSYS was used to build a finite element model of the knee joint and a customized additively manufactured knee joint orthosis. By applying a compressive load of 1100 N to the knee joint along the direction of the lower limb load-bearing axis, a simulation and stress analysis was performed to study the deloading effect of a custom additively manufactured knee orthosis on the knee compartment. A finite element analysis of KOA characteristics was conducted for verification, considering the influence of cartilage, ligament, and lower limb skin on the bearing capacity of the knee joint. Compared with the case without wearing any orthosis, after wearing the customized knee orthosis, the varus angle of the knee joint was reduced, the medial pressure of the knee joint was shifted to the lateral side, and the pressure of the medial compartment of the knee joint was significantly reduced. The custom additively manufactured knee orthosis can reduce the pressure generated by the medial compartment of the knee joint during walking in patients with early and mid-stage medial compartment knee osteoarthritis, and the load reduction effect is significant.

Key words: knee osteoarthritis (KOA), knee orthosis, finite element analysis, biomechanical properties, deloading effect

CLC Number:

XU Yuanjing, GAO Haifeng, WU Yuncheng, LIU Yihao, ZHANG Ziyan, HUANG Chenglan, WANG Zanbo, LIU Tongyou, WANG Caiping, MIAO Weiqiang, WANG Jinwu. Finite Element Analysis of Decompression Effect of Custom Additively Manufactured Knee Orthosis Compartments[J]. Journal of Shanghai Jiao Tong University, 2023, 57(5): 560-569.

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韧带	刚度系数/(N·mm^-1)
前外侧副韧带	2 144
后外侧副韧带	2 144
内侧副韧带	134
前交叉韧带	201
后交叉韧带	258
髌骨韧带	300

组织结构	弹性模量E/MPa	泊松比ν
骨骼	12 000	0.3
软骨	5	0.46
半月板	50	0.45
壳体及关节铰链	1 000	0.2
软垫	50	0.45

各部位网格划分	单元数	节点数	各部位网格划分	单元数	节点数
髌骨	1 483	2 439	股骨软骨	48 648	90 410
胫骨	24 122	36 463	半月板	9 803	17 432
股骨	42 404	63 464	软垫	135 631	222 446
腓骨	5 616	9 785	壳体	82 636	152 147
胫骨软骨	20 437	36 602	关节铰链	48 718	79 022