Contact mechanics of non-spherical hip joint replacements
- VernacularTitle:非球面人工髋关节接触力学
- Author:
Qian CHENG
1
;
Hui-yan WANG
2
;
Bo TIAN
3
;
San-xing ZHAO
1
;
Feng-cai WANG
1
,
3
,
4
Author Information
1. School of Mechanical Engineering, Wuhan University of Science and Technology
2. School of Computer Science and Technology, Nanjing University of Aeronautics and Astronautics
3. National Research Centre of Bearing Technology, Wafangdian Bearing Group Corporation (ZWZ)
4. School of Mechanical Engineering, Xi’an Jiaotong University
- Publication Type:Journal Article
- Keywords:
Non-spherical hip joint replacement;
Contact mechanics;
Edge contact;
Pressure distribution;
Finite element analysis
- From:
Journal of Medical Biomechanics
2012;27(5):E534-E541
- CountryChina
- Language:Chinese
-
Abstract:
Objective Due to the limitation of manufacturing techniques, possible design optimization selecting and influence of its wearing in clinical application, the bearing surface of hip joint replacements is presented as non-spherical geometry, and the finite element method can be used to study the contact mechanics behavior in such kind of non-spherical hip joint replacement. MethodsThe reconstructing of non-spherical articular surface based on spherical-grid-data model (SGDM) was developed to investigate the effect of contact mechanics of an ellipsoidal head against a spherical cup in a typical metal-on-metal hip joint replacement. Results The maximum contact pressure of the non-spherical bearing was decreased effectively, and meanwhile the contact area was increased when curvature radius of the ellipsoidal head around the centre of the contact zone was increased, while the effects of the cup inclination angle on the maximum contact pressure and contact area of the non spherical bearing under the same load showed relatively small, but the contact pressure distributions were different. Conclusions A well-controlled non-sphericity can improve the magnitude and distribution of contact pressures on metal-on-metal hip joint replacements. In addition, the developed model and evaluation method in this paper can be used for simulation of dynamic contact and wear prediction of non-spherical hip joint replacements.
