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Influence of clearance on the time-dependent performance of the hip following hemiarthroplasty: a finite element study with biphasic acetabular cartilage properties.

Li J, Hua X, Jin Z, Fisher J, Wilcox RK - Med Eng Phys (2014)

Bottom Line: Both a prolonged loading period of 4000 s and dynamic gait load of 10 cycles were considered.It was found that a larger clearance led to a higher stress level, a faster reduction in load supported by the fluid and a faster cartilage consolidation process.The results demonstrated that a larger clearance in hip hemiarthroplasty is more harmful to the acetabular cartilage and prosthesis heads with more available dimensions (i.e. smaller increments in diameter) could be manufactured for surgeons to achieve a lower clearance, and reduced contact stress in hemiarthroplasty surgeries.

View Article: PubMed Central - PubMed

Affiliation: Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, UK. Electronic address: ljyjerry@gmail.com.

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Contour of fluid flux on the acetabular cartilage for the hemiarthroplasty model with 0 and 2 mm radial clearances respectively at the instantaneous period in the static loading case. The directions of fluid flux were exhibited by grey vectors.
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fig0020: Contour of fluid flux on the acetabular cartilage for the hemiarthroplasty model with 0 and 2 mm radial clearances respectively at the instantaneous period in the static loading case. The directions of fluid flux were exhibited by grey vectors.

Mentions: The fluid flux for the hemiarthroplasty models with 0 mm and 2 mm clearances is illustrated in Fig. 4. For the model with no clearance, fluid flux mainly occurred around the edge region of the cartilage. For the model with 2 mm clearance, however, the fluid flux was higher in magnitude and scattered across a larger area around the central region of the acetabular cartilage, suggesting a faster consolidation process.


Influence of clearance on the time-dependent performance of the hip following hemiarthroplasty: a finite element study with biphasic acetabular cartilage properties.

Li J, Hua X, Jin Z, Fisher J, Wilcox RK - Med Eng Phys (2014)

Contour of fluid flux on the acetabular cartilage for the hemiarthroplasty model with 0 and 2 mm radial clearances respectively at the instantaneous period in the static loading case. The directions of fluid flux were exhibited by grey vectors.
© Copyright Policy - CC BY
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4644988&req=5

fig0020: Contour of fluid flux on the acetabular cartilage for the hemiarthroplasty model with 0 and 2 mm radial clearances respectively at the instantaneous period in the static loading case. The directions of fluid flux were exhibited by grey vectors.
Mentions: The fluid flux for the hemiarthroplasty models with 0 mm and 2 mm clearances is illustrated in Fig. 4. For the model with no clearance, fluid flux mainly occurred around the edge region of the cartilage. For the model with 2 mm clearance, however, the fluid flux was higher in magnitude and scattered across a larger area around the central region of the acetabular cartilage, suggesting a faster consolidation process.

Bottom Line: Both a prolonged loading period of 4000 s and dynamic gait load of 10 cycles were considered.It was found that a larger clearance led to a higher stress level, a faster reduction in load supported by the fluid and a faster cartilage consolidation process.The results demonstrated that a larger clearance in hip hemiarthroplasty is more harmful to the acetabular cartilage and prosthesis heads with more available dimensions (i.e. smaller increments in diameter) could be manufactured for surgeons to achieve a lower clearance, and reduced contact stress in hemiarthroplasty surgeries.

View Article: PubMed Central - PubMed

Affiliation: Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, UK. Electronic address: ljyjerry@gmail.com.

Show MeSH
Related in: MedlinePlus