Transient elastohydrodynamic lubrication in artificial knee joint with non-Newtonian fluids

Mongkolwongrojn, Mongkol; Wongseedakaew, Khanittha; Kennedy, Francis E.

doi:10.1016/j.triboint.2009.12.041

Cited by 27 publications

(12 citation statements)

References 10 publications

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“…A total knee replacement (TKR), made of ultra‐high‐molecular‐weight polyethylene (UHMWPE) tibial insert and metallic (or ceramic) femoral component, was investigated. The contacts between the femoral condyles and tibial insert in the medial and lateral compartments were both represented by the ball‐and‐socket geometry [10, 12] with uniform curvature radii, as shown in Fig. 1.…”

Section: Methodsmentioning

confidence: 99%

Elastohydrodynamic lubrication and wear modelling of the knee joint replacements with surface topography

Gao

Hua

Hewson

et al. 2018

Biosurface and Biotribology

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This numerical study predicted wear of lubricated total knee replacements with the existing of textured surface and the possibility of surface designs to reduce wear. In the first part, a wear model of metal-on-polyethylene total knee replacement was developed. The medial and lateral knee compartments was accounted for separately, with the contact force and motion during walking cycles applied. An adapted Archard wear formula was employed where the wear factor was an exponential function of the 'Lambda ratio' (film thickness to the average roughness). Wear of the soft bearing surface (polyethylene insert) was simulated with regularly geometry update until a steady-state wear observed. In the second part, the effect of surface topography of the knee replacements was investigated. The surface texturing techniques have shown promising benefit to machine components in many areas of engineering practice. The texture parameters were designed using the Taguchi method for the geometry, size, and distribution of the micro dimples. It was observed that the lateral compartment may benefit from surface texturing if dimples were properly designed, while the texturing showed hardly advantageous effect on the medial surface in terms of lubrication enhancement and wear reduction. Some results were presented in the 6th World Tribology Conference.

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Section: Methodsmentioning

confidence: 99%

Elastohydrodynamic lubrication and wear modelling of the knee joint replacements with surface topography

Gao

Hua

Hewson

et al. 2018

Biosurface and Biotribology

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show abstract

“…Furthermore, despite its decisive role, lubrication was neglected or strongly simplified in most theoretical studies on TKAs. Early approaches to tackle this issue neglected the local elastic deformation of the contacting bodies or assumed strongly simplified kinematics and geometries [ 59 , 60 , 61 , 62 , 63 ]. However, with advances in the simulation of the elastohydrodynamic lubrication (EHL) in THAs, some more sophisticated numerical models have also been developed for TKAs.…”

Section: Introductionmentioning

confidence: 99%

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

et al. 2021

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Diamond-like carbon coatings may decrease implant wear, therefore, they are helping to reduce aseptic loosening and increase service life of total knee arthroplasties (TKAs). This two-part study addresses the development of such coatings for ultrahigh molecular weight polyethylene (UHMWPE) tibial inlays as well as cobalt-chromium-molybdenum (CoCr) and titanium (Ti64) alloy femoral components. While the deposition of a pure (a-C:H) and tungsten-doped hydrogen-containing amorphous carbon coating (a-C:H:W) as well as the detailed characterization of mechanical and adhesion properties were the subject of Part I, the tribological behavior is studied in Part II. Pin-on-disk tests are performed under artificial synovial fluid lubrication. Numerical elastohydrodynamic lubrication modeling is used to show the representability of contact conditions for TKAs and to assess the influence of coatings on lubrication conditions. The wear behavior is characterized by means of light and laser scanning microscopy, Raman spectroscopy, scanning electron microscopy and particle analyses. Although the coating leads to an increase in friction due to the considerably higher roughness, especially the UHMWPE wear is significantly reduced up to a factor of 49% (CoCr) and 77% (Ti64). Thereby, the coating shows continuous wear and no sudden failure or spallation of larger wear particles. This demonstrated the great potential of amorphous carbon coatings for knee replacements.

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“…EHL analyses of the oscillatory lubricated conjunctions between the polymer bearing and a polished metallic femoral component of total knee prostheses have been carried out by Murakami and Ohtsuki (1987), Jin et al (1998) and Mongkolwongrojn et al (2010). The implant is lubricated in vivo by periprosthetic synovial fluid.…”

Section: Knee Prosthesesmentioning

confidence: 99%

“…Two different load cases were used (Fig. The solution methodology used in the analysis was that developed by Mongkolwongrojn et al (2010). In load case 1, the peak knee joint force was 2.4 kN, or 3.26BW for an individual weighing 750 N. It was assumed that the joint force was equally distributed between the medial and lateral condyles.…”

Section: Knee Prosthesesmentioning

confidence: 99%

Biomechanics of the hip and knee: implant wear

Kennedy

2013

Wear of Orthopaedic Implants and Artificial Joints

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Transient elastohydrodynamic lubrication in artificial knee joint with non-Newtonian fluids

Cited by 27 publications

References 10 publications

Elastohydrodynamic lubrication and wear modelling of the knee joint replacements with surface topography

Elastohydrodynamic lubrication and wear modelling of the knee joint replacements with surface topography

Amorphous Carbon Coatings for Total Knee Replacements—Part II: Tribological Behavior

Biomechanics of the hip and knee: implant wear

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