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Research Papers: Friction and Wear

Wear Characteristics of Conventional and Squeeze-Film Artificial Hip Joints

[+] Author and Article Information
S. Boedo, S. A. Coots

Department of Mechanical Engineering,
Rochester Institute of Technology,
Rochester, NY 14623

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received June 5, 2015; final manuscript received August 17, 2016; published online November 22, 2016. Assoc. Editor: Zhong Min Jin.

J. Tribol 139(3), 031603 (Nov 22, 2016) (10 pages) Paper No: TRIB-15-1185; doi: 10.1115/1.4034528 History: Received June 05, 2015; Revised August 17, 2016

This paper investigates the wear characteristics of a novel squeeze-film hip implant design. Key features of the design are elastic elements attached to the cup which provide a mechanical means for ball separation during the swing phase of the gait loading cycle. An Archard-based wear formulation was implemented utilizing the ansys finite element analysis program which relates contact pressure and sliding distance to linear wear depth. It is found that low-modulus elastic elements with bonded high-modulus metal coatings offer significant predicted improvement in linear and volumetric wear rates when compared with conventional implant geometries for gait cycle loading and kinematic conditions found in practice.

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Topics: Wear , Design , Cycles , Stress
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Figures

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Fig. 1

Schematic of squeeze-film artificial hip joint

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Fig. 2

Stance- and swing-phase characteristics of squeeze-film artificial hip joint

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Fig. 3

Sample embodiment of squeeze-film artificial hip joint

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Fig. 4

Surface geometry of cup portion—squeeze-film artificial hip joint

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Fig. 5

Configuration in unstressed state—squeeze-film artificial hip joint

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Fig. 6

Contact model—squeeze-film artificial hip joint

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Fig. 7

Contact model—conventional artificial hip joint

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Fig. 8

ISO 14242 duty cycle

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Fig. 9

Effect of coating thickness on linear wear rate distribution—elastic elements, squeeze-film artificial hip joint

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Fig. 10

Linear wear rate for conventional artificial hip joint—cup surface, uniform radial clearance: (a) metal-on-plastic (MOP) and (b) metal-on-metal (MOM)

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Fig. 11

Linear wear rate for conventional artificial hip joint—effects of combined radial clearance and ellipticity: (a) metal-on-plastic (MOP) and (b) metal-on-metal (MOM)

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