Analysis of the coefficient of friction as a function of the slide/roll ratio in total knee replacement

“…The results show different abrasion between pure rolling and rolling combined with gliding [4]. We therefore designed a wear simulator including these rolling-gliding movements to allow the analysis of wear behaviour in a long-term test set-up.…”

Section: Discussionmentioning

confidence: 99%

“…The concept of rolling and gliding a cylindrical counter-body against a plate has also been employed in a further "wheel-on-flat" apparatus in order to analyse the wear behaviour of polyethylene material in response to increasing traction forces [ 3 ]. The results show different abrasion between pure rolling and rolling combined with gliding [ 4 ]. We therefore designed a wear simulator including these rolling-gliding movements to allow the analysis of wear behaviour in a long-term test set-up.…”

Section: Discussionmentioning

confidence: 99%

“…For materials used in knee joints, the representation of a combined rolling and gliding contact is essential, since this type of motion causes different material abrasion compared to pure rolling or gliding alone [ 3 ]. Standardised methods such as Ring-on-Disc and Pin-on-Disc devices are not suitable, since they were developed for analysing pure gliding, but not a combined rolling and gliding motion [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

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A rolling-gliding wear simulator for the investigation of tribological material pairings for application in total knee arthroplasty

et al. 2010

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BackgroundMaterial wear testing is an important technique in the development and evaluation of materials for use in implant for total knee arthroplasty. Since a knee joint induces a complex rolling-gliding movement, standardised material wear testing devices such as Pin-on-Disc or Ring-on-Disc testers are suitable to only a limited extent because they generate pure gliding motion only.MethodsA rolling-gliding wear simulator was thus designed, constructed and implemented, which simulates and reproduces the rolling-gliding movement and loading of the knee joint on specimens of simplified geometry. The technical concept was to run a base-plate, representing the tibia plateau, against a pivoted cylindrical counter-body, representing one femur condyle under an axial load. A rolling movement occurs as a result of the friction and pure gliding is induced by limiting the rotation of the cylindrical counter-body. The set up also enables simplified specimens handling and removal for gravimetrical wear measurements. Long-term wear tests and gravimetrical wear measurements were carried out on the well known material pairings: cobalt chrome-polyethylene, ceramic-polyethylene and ceramic-ceramic, over three million motion cycles to allow material comparisons to be made.ResultsThe observed differences in wear rates between cobalt-chrome on polyethylene and ceramic on polyethylene pairings were similar to the differences of published data for existing material-pairings. Test results on ceramic-ceramic pairings of different frontal-plane geometry and surface roughness displayed low wear rates and no fracture failures.ConclusionsThe presented set up is able to simulate the rolling-gliding movement of the knee joint, is easy to use, and requires a minimum of user intervention or monitoring. It is suitable for long-term testing, and therefore a useful tool for the investigation of new and promising materials which are of interest for application in knee joint replacement implants.

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Tribology studies of the natural knee using an animal model in a new whole joint natural knee simulator

Liu

Jennings

Ingham

et al. 2015

Journal of Biomechanics

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The successful development of early-stage cartilage and meniscus repair interventions in the knee requires biomechanical and biotribological understanding of the design of the therapeutic interventions and their tribological function in the natural joint. The aim of this study was to develop and validate a porcine knee model using a whole joint knee simulator for investigation of the tribological function and biomechanical properties of the natural knee, which could then be used to pre-clinically assess the tribological performance of cartilage and meniscal repair interventions prior to in vivo studies. The tribological performance of standard artificial bearings in terms of anterior-posterior (A/P) shear force was determined in a newly developed six degrees of freedom tribological joint simulator. The porcine knee model was then developed and the tribological properties in terms of shear force measurements were determined for the first time for three levels of biomechanical constraints including A/P constrained, spring force semi-constrained and A/P unconstrained conditions. The shear force measurements showed higher values under the A/P constrained condition (predominantly sliding motion) compared to the A/P unconstrained condition (predominantly rolling motion). This indicated that the shear force simulation model was able to differentiate between tribological behaviours when the femoral and tibial bearing was constrained to slide or/and roll. Therefore, this porcine knee model showed the potential capability to investigate the effect of knee structural, biomechanical and kinematic changes, as well as different cartilage substitution therapies on the tribological function of natural knee joints.

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Analysis of the coefficient of friction as a function of the slide/roll ratio in total knee replacement

Cited by 7 publications

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Wear of UHMWPE from sliding, rolling, and rotation in a multidirectional tribo-system

Wear of UHMWPE from sliding, rolling, and rotation in a multidirectional tribo-system

A rolling-gliding wear simulator for the investigation of tribological material pairings for application in total knee arthroplasty

Tribology studies of the natural knee using an animal model in a new whole joint natural knee simulator

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