Jimenez-Bescos PhD Thesis.pdf (20.86 MB)
Dynamic finite element analysis of hip resurfacing arthroplasty and the influence of resting periods
thesis
posted on 2023-08-30, 13:49 authored by Carlos Jimenez-BescosThe third generation of hip resurfacing commenced in the U.K. in the 1990’s with the Birmingham
Hip Resurfacing system and is now becoming more commonplace as an attractive alternative for
young and active patients due to premature failure in total hip replacement in this patient group.
However the Swedish National Hip Arthroplasty Register (2010) suggests that premature failure of
resurfacing arthroplasty may be more prevalent than first expected. The aim of this study is to
investigate, through Finite Element Analysis, the short, medium and long term performance of Poly
Methyl Methacrylate (PMMA) bone cement of the femoral component in hip resurfacing
arthroplasty. The study takes a forensic engineering approach, analysing the performance of
PMMA bone cement in order to provide understanding, awareness and an insight into lifestyle options.
Finite Element Analysis explores and models the effect of resting periods during daily activities,
patients’ bone quality and PMMA bone cement Young’s modulus on the PMMA bone cement
stresses within the femoral hip resurfacing component. Mechanical tests are used to illustrate the use of the Finite Element Analysis results.
Contributing to knowledge, this study verifies the significance of high metal-on-metal friction due to resting periods, developing a dynamic FEA model to quantify the premature fatigue failure of
PMMA bone cement, within the femoral component of hip resurfacing arthroplasty. A decrease in
bone quality added to the effect of resting periods increase the risk of PMMA fatigue failure and PMMA-metal interface failure due to an increase of PMMA tensile and shear stresses, suggesting that patients with low bone quality should avoid hip resurfacing procedures. The use of low PMMA Young’s modulus could greatly enhance the long term success of hip resurfacing arthroplasty generally and specifically reduce the risk of interface failure and PMMA bone cement failure due to resting periods and patient bone quality. Moreover, this study shows that the consequence of PMMA fatigue failure and PMMA-metal interface failure must be included in the design, patient selection, screening process, post-operative rehabilitation and long term lifestyle attributes.
This study suggests that occupational therapists and patients with hip resurfacing arthroplasty
should be aware of high metal-on-metal friction situations, which could lead to early failure
indicated by this research. The deleterious effect of resting periods indicated by this research
could be alleviated by appropriate re-initiation of synovial lubrication by movement prior to full
loading. Recommendations for further work include the compilation of a PMMA bone-cement fatigue properties database and further development of the FEA modelling technique for application upon other arthroplasty procedures.
History
Institution
Anglia Ruskin UniversityFile version
- Accepted version
Language
- eng
Thesis name
- PhD
Thesis type
- Doctoral
Legacy posted date
2013-07-08Legacy creation date
2019-08-07Legacy Faculty/School/Department
Theses from Anglia Ruskin University/Faculty of Science and TechnologyUsage metrics
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