Influence of clearance on the time-dependent performance of the hip following hemiarthroplasty: a finite element study with biphasic acetabular cartilage properties.
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.
Affiliation: Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, UK. Electronic address: email@example.com.Show MeSH
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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.
Affiliation: Institute of Medical and Biological Engineering, School of Mechanical Engineering, University of Leeds, UK. Electronic address: firstname.lastname@example.org.