1. Tribological property of the cobalt-chromium femoral head with different regions of wear in total hip arthroplasty
- Author
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Patro Bp, Nam Js, Duong Ct, Chang Jd, Lee Ss, Park S, and Seo Em
- Subjects
medicine.medical_specialty ,Materials science ,Friction ,Surface Properties ,chemistry.chemical_element ,Prosthesis Design ,law.invention ,Femoral head ,Chromium ,law ,Hardness ,Surface roughness ,medicine ,Humans ,Computer Simulation ,Composite material ,Bearing (mechanical) ,Femur Neck ,Mechanical Engineering ,General Medicine ,Tribology ,Surgery ,Equipment Failure Analysis ,medicine.anatomical_structure ,chemistry ,Models, Chemical ,Vickers hardness test ,Chromium Alloys ,Hip Prosthesis ,Cobalt ,Total hip arthroplasty - Abstract
The tribological properties of engineering and biological materials have been investigated at microscale levels through the calculation of the surface roughness and frictional coefficient using atomic force microscopy (AFM). Although a number of previous studies have reported the frictional coefficients of diverse bearing materials in total hip arthroplasty (THA), the relationship between the surface roughness and frictional coefficient of bearing materials of THA have not been reported, and furthermore, the tribological properties for different wear regions of a cobalt-chromium (Co—Cr) femoral head have not been well identified. Therefore, the objective of this study is to investigate the relationships between the surface roughness, frictional coefficient, and hardness for both the main-wear and the least-wear regions of a Co—Cr femoral head 10 years after THA. The average Vickers hardness of the Co—Cr femoral head was 380.7 ± 11.3 HV. With the scanned area of 25 μm×25 μm through AFM, the frictional coefficients of the main-wear and the least-wear regions were 0.229 ± 0.054 and 0.243 ± 0.059, respectively, and showed no statistical differences between these two regions ( p = 0.449). However, differences in the surface roughness ( Rq) between the main-wear region ( Rq = 96.5 ± 26.2 nm) and the least-wear region ( Rq = 17.7 ± 4.2 nm) were statistically significant ( p
- Published
- 2010