The impact of surface and geometry on coefficient of friction of artificial hip joints.

Authors :: Choudhury D
Vrbka M
Mamat AB
Stavness I
Roy CK
Mootanah R
Krupka I
Source :: Journal of the mechanical behavior of biomedical materials [J Mech Behav Biomed Mater] 2017 Aug; Vol. 72, pp. 192-199. Date of Electronic Publication: 2017 May 06.
Publication Year :: 2017
Abstract: Coefficient of friction (COF) tests were conducted on 28-mm and 36-mm-diameter hip joint prostheses for four different material combinations, with or without the presence of Ultra High Molecular Weight Polyethylene (UHMWPE) particles using a novel pendulum hip simulator. The effects of three micro dimpled arrays on femoral head against a polyethylene and a metallic cup were also investigated. Clearance played a vital role in the COF of ceramic on polyethylene and ceramic on ceramic artificial hip joints. Micro dimpled metallic femoral heads yielded higher COF against a polyethylene cup; however, with metal on metal prostheses the dimpled arrays significantly reduced the COF. In situ images revealed evidence that the dimple arrays enhanced film formation, which was the main mechanism that contributed to reduced friction.<br /> (Copyright © 2017 Elsevier Ltd. All rights reserved.)

Subjects :: Bone-Implant Interface
Hip Joint
Humans
Metal-on-Metal Joint Prostheses
Ceramics analysis
Friction
Hip Prosthesis
Materials Testing
Polyethylenes analysis

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