Polyethylene wear in uncemented knee replacements

Jones, Steven M.; Pinder, I. M.; Moran, C. G.; Malcolm, A. J.

doi:10.1302/0301-620x.74b1.1732256

Cited by 93 publications

(37 citation statements)

References 11 publications

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“…The effect of contact pressure on wear has been previously reported for unidirectional motion pin-on-plate studies [2] and the effect of conformity on surface area on wear has also been reported in the hip [26]. This approach to reducing surface wear by reducing conformity and wear area contradicts the thinking of the 1980s and 1990s [5,6,8,19] that led to more conforming designs in order to avoid the risk of delamination and fatigue following oxidative degradation. The conformity of fixed-bearing knee designs has generally increased over the last two decades, partly to address concerns over fatigue failure and delamination due to oxidative degradation of polyethylene.…”

Section: Discussionmentioning

confidence: 99%

“…Historically, the failure of gamma-in-air sterilization polyethylene in knees was due to oxidative degradation, causing a reduction in mechanical properties and fatigue failure, which has been described as delamination wear [5,6,8,19]. Oxidative degradation also increases surface wear and osteolysis [7].…”

Section: Introductionmentioning

confidence: 99%

“…Oxidative degradation also increases surface wear and osteolysis [7]. It is important to differentiate the delamination wear mechanisms, which produce fatigue failure [6,19], from the surface wear mechanisms, which produce submicron-and nanometer-sized wear particles and result in long-term osteolysis [16,17,24]. Surface wear leading to the potential of osteolysis is considered the longer-term risk factor, particularly since increased kinematics with more active patients substantially increases wear rates and the total wear volume in fixed-bearing knees [4,22].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

2009 Knee Society Presidential Guest Lecture: Polyethylene Wear in Total Knees

Fisher

Jennings

Galvin

et al. 2010

Clinical Orthopaedics &Amp; Related Research

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Knee arthroplasties in young and active patients place a substantial increase in the lifetime tribological demand and potential for wear-induced osteolysis. Polyethylene materials have advanced in recent years, reducing the potential for oxidative degradation and delamination failure. It is timely to consider tribological design variables and their potential to reduce surface wear and the long-term risk of osteolysis. The influence of reduced cross shear in rotating platform mobile-bearing knee designs and reduced surface wear area in low conforming fixed-bearing knees has been investigated. A reduction in cross shear substantially reduced wear in both multidirectional pin-on-plate studies and in rotating platform mobile-bearing designs in knee simulator studies. A reduction in bearing surface contact area substantially reduced surface wear in multidirectional pin-on-plate simulations and in low conforming fixed-bearing knee designs in knee simulator studies. This offers potential for a paradigm shift in knee design predicated by enhanced mechanical properties of new polymer materials. We describe two distinct low-wearing tribological design solutions: (1) a rotating platform design solution with reduced cross shear provides reduced wear with conformity and intrinsic stability; and (2) a low conformity fixed bearing with reduced surface area, provides reduced wear, but has less intrinsic stability and requires good soft tissue function.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

2009 Knee Society Presidential Guest Lecture: Polyethylene Wear in Total Knees

Fisher

Jennings

Galvin

et al. 2010

Clinical Orthopaedics &Amp; Related Research

View full text Add to dashboard Cite

show abstract

“…Delamination of PCA total knees has been attributed to hot pressing of the polyethylene surface coupled with the low conforming surface (Bloebaum et al 1991, Collier et a). 1991, Engh et al 1992, Jones et al 1992. Hot pressing leads to reduced crystallinity of the polyethylene in a well defined zone, extending to approximately 1 mm below the surface (Bloebaum et al 1991).…”

Section: Discussionmentioning

confidence: 99%

Polyethylene wear in unicondylar knee prostheses

Blunn

Joshi

Lilley

et al. 1992

Acta Orthopaedica Scandinavica

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“…[4], which is 72 months. There were also studies on the massive delaminating of the polyethylene occurred earlier [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

The Knee Wear Prediction of UHMWPE Tibial Insert Using VIPRO Platform

Capitanu¹,

Vlădăreanu²,

Florescu³

2015

JMEA

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Abstract:The failure mechanism was postulated as a combination of the high level of loading during normal activities and a non-conforming contact mechanism between the femoral condyles and the tibial insert. The question that arises is: could be this phenomenon evaluated quantitatively a priori, e.g., could be the failure due to delamination wear predicted? In order to do some finite element simulations were performed to dynamically determinate the contact area and contact pressure for three different activities. The results obtained using VIPRO platform lead to the conclusion that many clinically reported failures of the tibial tray are caused by the adhesive and fatigue wear.

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Polyethylene wear in uncemented knee replacements

Cited by 93 publications

References 11 publications

2009 Knee Society Presidential Guest Lecture: Polyethylene Wear in Total Knees

2009 Knee Society Presidential Guest Lecture: Polyethylene Wear in Total Knees

Polyethylene wear in unicondylar knee prostheses

The Knee Wear Prediction of UHMWPE Tibial Insert Using VIPRO Platform

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