期刊
JOURNAL OF BIOMECHANICS
卷 44, 期 8, 页码 1536-1542出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jbiomech.2011.02.140
关键词
Hemiarthroplasty; Articular cartilage; Biphasic; Finite element; Contact mechanics
资金
- Overseas Research Students Awards
- Wellcome Trust
- EPSRC [WT088908/z/09/z]
- Engineering and Physical Sciences Research Council [EP/I019103/1] Funding Source: researchfish
- EPSRC [EP/I019103/1] Funding Source: UKRI
Biphasic properties of articular cartilage allow it to be an excellent bearing material and have been studied through several simplified experiments as well as finite element modelling. However, three-dimensional biphasic finite element (FE) models of the whole joint are rare. The current study was carried out to experimentally validate FE methodology for modelling hemiarthroplasty. Material properties such as equilibrium elastic modulus and permeability of porcine acetabular cartilage were initially derived by curve-fitting an experimental deformation curve with that obtained using FE. These properties were then used in the hemiarthroplasty hip joint modelling. Each porcine acetabular cup was loaded with 400 N using a 34 mm diameter CoCr femoral head. A specimen-specific FE model of each acetabular cup was created using mu CT and a series of software processes. Each model was analysed under conditions similar to those tested experimentally. Contact stresses and contact areas predicted by the model, immediately after loading, were then compared with the corresponding experimentally measured values. Very high peak contact stresses (maximum experimental: 14.09 MPa) were recorded. A maximum difference of 12.42% was found in peak contact stresses. The corresponding error for contact area was 20.69%. Due to a fairly good agreement in predicted and measured values of contact stresses and contact areas, the integrated methodology developed in this study can be used as a basis for future work. In addition, FE predicted total fluid load support was around 80% immediately after loading. This was lower than that observed in conforming contact problems involving biphasic cartilage and was due to a smaller local contact area and variable clearance making fluid exudation easier. (C) 2011 Elsevier Ltd. All rights reserved.
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