Finite element modeling and mechanical analysis for Cam-type femoroacetabular impingement

doi:10.3969/j.issn.2095-4344.2014.40.020

Abstract

Abstract:

BACKGROUND: Cam-type femoroacetabular impingement can impose elevated mechanical loading in the hip, and may eventually result in hip osteoarthritis, while mechanical mechanism on how this deformity leads to osteoarthritis is still unclear.

OBJECTIVE: To analyze intra-articular mechanical environment of Cam-type femoroacetabular impingement in hip joint using three-dimensional finite element method, and to further understand the features of pathological mechanics.

METHODS: Three-dimensional geometry models of normal and Cam-type femoroacetabular impingement joints were constructed using Mimics and Hypermesh software with the CT data of normal hip joint. These hip models were imported into LS-DYNA analysis system, then dynamic loads and motions for standing up and sitting down were applied to all joint models. Intra-articular cartilage contact pressures and stresses were analyzed in normal hip joint and hip joint with Cam-type femoroacetabular impingement.

RESULTS AND CONCLUSION: Based on CT data, models of normal hip joint and hip joint with Cam-type femoroacetabular impingement including articular cartilage for three-dimensional finite element analysis were accurately constructed. Peak contact pressures were 4.43 and 4.59 MPa at the anterosuperior region of the acetabular rim during sitting down and standing up. The peaks of Cam-type femoroacetabular impingement hip joint were 14.96 and 14.86 MPa. Peak pressures and stress concentration were found at the anterosuperior area of acetabular rim. High contact pressure at the acetabular cartilage may be the mechanical mechanism of osteoarthritis induced by Cam-type femoroacetabular impingement.

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

全文链接：

Key words: hip joint, three-dimensional, imaging, finite element analysis, biomechanics

CLC Number:

R318

Liu Qian, Wang Wan-chun, Yao Chang-hai. Finite element modeling and mechanical analysis for Cam-type femoroacetabular impingement[J]. Chinese Journal of Tissue Engineering Research, 2014, 18(40): 6513-6518.

Figures/Tables 4

References

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