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KMID : 0361620090440050507
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Journal of the Korean Orthopaedic Association
2009 Volume.44 No. 5 p.507 ~ p.513
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Effects of the Amount of Proximal Tibia Resection on the Bone Strength of Prepared Bone Surface: A FEM Study
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Kim Kwang-Kyoun
Won Ye-Yeon
Cui Wen-Quan
Baek Myong-Hyun
Kwon Soon-Haeng
Lee Joo-Hong
Kim Yong-Beum
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Abstract
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Purpose: We wanted to evaluate the mechanical strength of proximal tibia as resection distance increased from the joint surface.
Materials and Methods: We obtained the CT images of twenty knee osteoarthritis patients undergoing total knee arthroplasty. The finite element models were created based on the computed tomography images. The 8-node hexahedron element was made from BIONIX™ (CANTIBio. Co, Suwon, Korea), which is automatic mesh generation software program. The finite element model of the proximal tibia was resected at 6 ㎜, 8 ㎜, 10 ㎜, 12 ㎜, 15 ㎜ and 18 ㎜ from the lateral joint surface. A 1 % strain rate was applied to a model by using HyperMesh™ software (Altair Engineering. Inc, Seattle, USA). The ultimate stress was calculated from the finite element analysis with using ANSYS 9.0 (ANSYS. Inc, Orlando, USA).
Results: The mean ultimate stress was 906.84 ㎫, 877.22 ㎫, 895.93 ㎫, 852.70 ㎫, 742.90 ㎫ and 585.51 ㎫ at the 6 ㎜, 8 ㎜, 10 ㎜, 12 ㎜, 15 ㎜ and 18 ㎜ resection levels. As co㎫re to the 6 ㎜ resection level, the bone strengths at 15 ㎜ and 18 ㎜ were decreased with statistical significance (15 ㎜: p=0.005, 18 ㎜: p=0.000).
Conclusion: The ultimate stress was decreased as the resection distance increased from the joint surface. But within a 12 ㎜ resection distance from the lateral condyle articular surface of the tibia, the ultimate stress was not significantly decreased (p＞0.05).
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KEYWORD
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Tibia, Osteoarthritis, Finite element analysis, Ultimate stress, Total knee arthroplasty
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