Three-dimensional finite element analysis of stress distribution in necrotic femoral head before and after tantalum rod implantation

doi:10.3969/j.issn.2095-4344.2016.26.013

Abstract

Abstract:

BACKGROUND: Tantalum rod implant technology is a new method of early osteonecrosis treatment. Current research on stress distribution before and after tantalum rod implant in different sizes of femoral head necrosis area is few.

OBJECTIVE: To analyze the stress distribution before and after tantalum rod implantation in different sizes of necrotic femoral head area using three-dimensional finite element method.

METHODS: Three-dimensional finite element models of normal femoral head and necrotic femoral head of 15, 20 and 30 mm diameter were constructed. Eight measuring points were chosen on two tiers of each necrotic model to detect the stress distribution and its alteration before and after tantalum rod implantation.

RESULTS AND CONCLUSION: (1) Stress concentration were found on every necrotic femoral head, most pronounced on the one with 30 mm lesion. (2) Tantalum implant appeared to reduce the stress concentration generally. Comparison of the peak points of these models indicated most significant benefit in 15 mm lesion, next in 30 mm lesion, last in 20 mm lesion. (3) Results indicate that larger lesion entails more concentrated stress distribution and more likely to collapse. Tantalum rod implantation can delay the development of necrosis of the femoral head, and is most effective in small lesion.
中国组织工程研究杂志出版内容重点：人工关节；骨植入物；脊柱；骨折；内固定；数字化骨科；组织工程

Key words: Femur Head Necrosis, Finite Element Analysis, Biomechanics, Tissue Engineering

CLC Number:

R318

Zhu Gang, Zhang Li-gui, Zheng Zhong, Xu Ming-jie, Yang Ming. Three-dimensional finite element analysis of stress distribution in necrotic femoral head before and after tantalum rod implantation[J]. Chinese Journal of Tissue Engineering Research, 2016, 20(26): 3883-3889.

Figures/Tables 7

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