Prediction of lubrication regimes in wrist implants with spherical bearing surfaces

Pylios, T.; Shepherd, Duncan E.T.

doi:10.1016/s0021-9290(03)00265-3

Cited by 14 publications

(5 citation statements)

References 23 publications

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“…Designs include the Biaxial (DePuy International Ltd, Leeds, UK), Universal 2 (Integra, Plainsboro, NJ, USA), and Re-motion (Small Bone innovations, Morrisville, PA, USA) [51]. These cobalt chrome molybdenum alloys against ultrahigh-molecular-weight polyethylene articulating implants operate with a boundary lubrication regime [52] and therefore wear is likely. However, owing to the early failure of these wrist implants, wear problems have only been detailed in a few studies.…”

Section: Wrist Joint Replacementmentioning

confidence: 99%

Joint Replacement Implants

Shepherd

2010

Biomechanics of Hard Tissues

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Section: Wrist Joint Replacementmentioning

confidence: 99%

Joint Replacement Implants

Shepherd

2010

Biomechanics of Hard Tissues

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“…At intermediate values of lambda ratios from 1 to 3 mixed lubrication is indicated and less than unity, boundary lubrication [13]. The values of surface roughness for the materials used in the analysis are for metals 0.008 µm [21] and 0.163 µm [23] for soft layer.…”

Section: Lubrication Regimesmentioning

confidence: 99%

“…The wear of silicone rubber implants leads to silicone synovitis [18], while the wear of ultra high molecular weight polyethylene (UHMWPE) has been linked with osteolytic phenomena [10]. Lubrication analyses in hip, knee [10], wrist [21] and finger joints [17] have shown that the "conventional" total joint replacements operate under a mixed or boundary lubrication regime.…”

Section: Introductionmentioning

confidence: 99%

Soft layered concept in the design of metacarpophalangeal joint replacement implants

Pylios

Shepherd²

2008

Bio-Medical Materials and Engineering

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The metacarpophalangeal (MCP) joint is crucial for hand function, but the joints are frequently affected by arthritis, leading to pain and disability. Joint replacement implants are used to replace the diseased MCP joint. This paper presents an investigation of applying the soft layered concept in the design of a new MCP joint replacement implant. Analytical methods were used to investigate the minimum film thickness for a novel MCP joint with a soft layer. The effect of load, entraining velocity, radial clearance, radius of the metacarpal head, elastic modulus and thickness of the soft layer were investigated. The soft layered joints show an enhanced predicted film thickness and some evidence of fluid film lubrication that should help to reduce wear rates. It may be beneficial for future MCP joint implant designs to utilise the soft layered joint concept.

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“…Analogous to published work for artificial hips [5], or wrist implants [6] the lubrication regimes for lumbar TDRs with ball and socket design have been estimated in previous studies [7,8]. In [9] the lubrication regime for cervical TDR was analyzed.…”

Section: Introductionmentioning

confidence: 96%

Investigation into the Lubrication Regime for Lumbar Total Disc Replacement of the Spine

Kraft¹

2013

IOSRJEN

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-The lubrication regime of articulating surfaces plays an important role for the understanding of the tribological conditions and the resulting wear performance of total disc replacement (TDR) of the spine. In the present study the lubrication regime for lumbar TDRs with ball and socket design have been assessed by applying the Hamrock-Dawson elasto-hydrodynamic lubrication theory. The effect of varying articulation radii and different material combinations on the lubrication regime have been investigated considering load and motion cycles for a representative in vivo situation as well as for in vitro wear testing situations. Independent of geometry or bearing material combinations, the formation of a stable lubrication film is very unlikely for lumbar TDR. The study also reveals that in vitro testing conditions must be carefully selected in order to correlate with the lubrication regime for corresponding in vivo situations.

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Prediction of lubrication regimes in wrist implants with spherical bearing surfaces

Cited by 14 publications

References 23 publications

Joint Replacement Implants

Joint Replacement Implants

Soft layered concept in the design of metacarpophalangeal joint replacement implants

Investigation into the Lubrication Regime for Lumbar Total Disc Replacement of the Spine

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