Chinese Journal of Clinical Anatomy >
The finite element analysis of the total hip replacement with cup invagination in dysplasia of hip
Received date: 2013-11-23
Online published: 2014-06-04
Objective Using the three dimensional finite element analysis, the stress distribution in acetabular cup-bone interface in different ranges of cup invagination during total hip replacement (THR) in treating the dysplasia of hip affected was studied. Methods Pelvis in the dysplasia was scanned by CT. Using the computer simulation technology to reconstruct the three-dimensional model of the pelvis for observing the dysplasia of hip from CT scan images. Different ranges of cup invagination in THR in the pelvic model were simulated. Then the pelvis and acetabular cup model were meshed. the mechanics analysis tool in SolidWorks was used to analyze the three-dimensional model, and the stress data in acetabular cup-bone interface was obtained. After the statistical analysis of the experiment result, the different ranges of cup invagination that affected the stress distribution in acetabular cup-bone interface were observed. Results greater contact area and smaller stress per unit area were resulted due to acetabular deepened grinding and cup invagination. With the increasing degree of acetabular deepened grinding, the bone in the acetabular wall broke more obviously, leading to increasing the stress concentration at the top of the acetabulum and uneven stress in the rest. Conclusion Acetabular deepened grinding and cup invagination improve bone bed inclusion of cup during total hip replacement in treating the dysplasia of hip. However, the increasing deepened grinding and perforation of acetabular wall will lead to significant changes of the stress distribution of acetabula and stress concentration. The perforation of acetabular wall should be minimized.
Key words： Dysplasia; Hip; Arthroplasty; Finite element analysis; Biomechanics
HU Jie , MA Re-Fan , CA Zhi-Qing , LI De , DING Yue , LIU Chang-Li . The finite element analysis of the total hip replacement with cup invagination in dysplasia of hip[J]. Chinese Journal of Clinical Anatomy, 2014 , 32(3) : 343 -347 . DOI: 10.13418/j.issn.1001-165x.2014
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