Finite element analysis of effects of different sizes of osteochondral defect after total medial meniscectomy
Author(s): Lin-song Ji, Yan-lin Li, Zan Huang, Di Jia, Yang Yu, Huan-yu Gao, Department of Sport Medicine, the First Affiliated Hospital of Kunming Medical University
Pages: 65-70
Year: 2016 Issue: 8
Journal: China Journal of Modern Medicine
Keyword: knee joint; osteochondral defect; biomechanical; finite element analysis; meniscectomy;
Abstract: Objective To study the reconstruction of three dimensional finite element model based on two-dimensional MRI image data of the knee joint. To explore the stress effects on knee joint from the different sizes of osteochondral defect simulated on the medial femoral condyle after total medial meniscectomy with finite element analysis. Methods A fidelity 3-digital knee model including bones, articular cartilage, menisci and ligaments based on two-dimensional MRI image data was reconstructed. Then we developed a model of a total medial meniscectomy.Six full-thickness cartilage defects(0.49, 0.80, 1.0, 1.70, 2.56 and 3.24 cm2) were simulated on the medial femoral cartilage, which corresponded to the most often damaged condyle. A compressive load of 1,150 N was applied at the top surface of the femur, which corresponded to the load of the gait cycle for a full extension position. The maximalshear stress and maximal compressive stress were investigated. Results The contact stress of both the medial compartment and the lateral compartment of the knee joint was obviously affected by the different sizes of osteochondral defect simulated on the medial femoral condyle after total medial meniscectomy. But the impact of the medial compartment was more obvious than the lateral compartment. Conclusions A 3-digital fidelity knee model can provides a better understanding of the healthy knee contact behavior, and investigates the effect of cartilage defects simulated on the medial femoral cartilage after total medial meniscectomy on the knee biomechanics.
Pages: 65-70
Year: 2016 Issue: 8
Journal: China Journal of Modern Medicine
Keyword: knee joint; osteochondral defect; biomechanical; finite element analysis; meniscectomy;
Abstract: Objective To study the reconstruction of three dimensional finite element model based on two-dimensional MRI image data of the knee joint. To explore the stress effects on knee joint from the different sizes of osteochondral defect simulated on the medial femoral condyle after total medial meniscectomy with finite element analysis. Methods A fidelity 3-digital knee model including bones, articular cartilage, menisci and ligaments based on two-dimensional MRI image data was reconstructed. Then we developed a model of a total medial meniscectomy.Six full-thickness cartilage defects(0.49, 0.80, 1.0, 1.70, 2.56 and 3.24 cm2) were simulated on the medial femoral cartilage, which corresponded to the most often damaged condyle. A compressive load of 1,150 N was applied at the top surface of the femur, which corresponded to the load of the gait cycle for a full extension position. The maximalshear stress and maximal compressive stress were investigated. Results The contact stress of both the medial compartment and the lateral compartment of the knee joint was obviously affected by the different sizes of osteochondral defect simulated on the medial femoral condyle after total medial meniscectomy. But the impact of the medial compartment was more obvious than the lateral compartment. Conclusions A 3-digital fidelity knee model can provides a better understanding of the healthy knee contact behavior, and investigates the effect of cartilage defects simulated on the medial femoral cartilage after total medial meniscectomy on the knee biomechanics.
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