Finite element modeling and mechanical analysis for Cam-type femoroacetabular impingement
10.3969/j.issn.2095-4344.2014.40.020
- VernacularTitle:构建Cam型髋关节撞击综合征有限元模型及力学分析
- Author:
Qian LIU
;
Wanchun WANG
;
Changhai YAO
- Publication Type:Journal Article
- Keywords:
hip joint;
three-dimensional,imaging;
finite element analysis;
biomechanics
- From:
Chinese Journal of Tissue Engineering Research
2014;(40):6513-6518
- CountryChina
- Language:Chinese
-
Abstract:
BACKGROUND:Cam-type femoroacetabular impingement can impose elevated mechanical loading in the hip, and may eventual y result in hip osteoarthritis, while mechanical mechanism on how this deformity leads to osteoarthritis is stil 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.
METHODThree-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 al 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.
