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

Patten, Eli W.; Citters, Douglas W. Van; Ries, Michael D.; Pruitt, Lisa A.

doi:10.1016/j.wear.2013.04.017

Cited by 28 publications

(10 citation statements)

References 32 publications

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“…The mean wear factor value obtained in the present study, 2.0 × 10 -6 mm 3 /Nm, is close to that obtained with another ball-on-flat (radius 22 mm, load 200 N) knee wear device using biaxial sliding in the form of a figure of eight, 2.4 ± 0.08 × 10 -6 mm 3 /Nm [Patten et al, 2013].…”

Section: Discussionsupporting

confidence: 88%

In vitro wear simulation on the RandomPOD wear testing system as a screening method for bearing materials intended for total knee arthroplasty

Saikko

2014

Journal of Biomechanics

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The 16-station RandomPOD wear test system, previously validated for prosthetic hip wear, was used in the simulation of knee wear mechanisms with a ball-on-flat test configuration.This consisted of a CoCr pin with a ground and polished spherical bearing surface (radius 28 mm) against a conventional, gamma-sterilized UHMWPE disk in serum lubrication. The biaxial motion, consisting of x and y translations, and the load were non-cyclic. Relative to the disk, the center of contact wandered within a circle of 10 mm diameter, and the average sliding velocity was 15.5 mm/s (range 0 to 31 mm/s). The load varied non-cyclically between 0 and 142 N (average 73 N). In the 60-day test with 16 similar wear couples, moderate adhesive wear, the principal wear mechanism of a well-functioning prosthetic knee, dominated. This showed as a burnished, circular wear mark (diameter 13.2 mm, area 137 mm 2 ). The wear factor was 2.04 ± 0.03 × 10 -6 mm 3 /Nm (mean ± 95 per cent confidence limit). For the first time a truly multidirectional, realistic and uniform, large capacity pin-ondisk simulation of knee wear mechanisms was implemented.

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Section: Discussionsupporting

confidence: 88%

In vitro wear simulation on the RandomPOD wear testing system as a screening method for bearing materials intended for total knee arthroplasty

Saikko

2014

Journal of Biomechanics

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“…The presence of scratching and abrasion damage features on the backside of the polyethylene tibial insert is evidence of micro‐motion between the insert and the tibial tray . The arc marks measured for this study have also been noted in previous work as strongly indicative of rotatory micro‐motion, and thus the potential creation of a feedback loop of polyethylene wear and erosion creating space within the tibial tray for larger and larger micro‐motion. To our knowledge, this is the first study to quantify micro‐motion via arc marks, and to demonstrate a quantifiable relationship between in vivo micro‐motion and polyethylene wear.…”

Section: Discussionsupporting

confidence: 75%

“…Wang suggests that this may be due to the ability of non‐cross‐linked polyethylene lamellae to align with the primary direction of motion, making them more susceptible to wear in multidirectional motion . The general tenets of Wang's model have proven durable over time with additional consideration given to crossing intensity and rolling‐sliding conditions . While this has been applied to laboratory models and in vivo wear studies of the intended articulation in total knee arthroplasty, no studies have quantified the contribution of motion to in vivo wear of the backside of knee bearings.…”

mentioning

confidence: 99%

Contribution of micro‐motion to backside wear in a fixed bearing total knee arthroplasty

Levine

Lewicki

Currier

et al. 2016

Journal Orthopaedic Research

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This study seeks to identify important factors related to backside wear of tibial inserts in vivo and determine an appropriate wear model for backside wear. An IRB approved database was queried for tibial inserts of a single design from one manufacturer that exhibited evidence of rotatory motion on the backside of the polyethylene. These devices were measured for volumetric wear using a previously established protocol. Features including the change in locking lip width and measurement of micro-motion marks were used to describe the motion pattern. Volumetric wear and implant characteristics were compared using linear regressions by modeling wear theories suggested by Archard and Wang to determine the most appropriate model for backside wear. The Wang model showed that duration, adjusted sliding distance, and cross-shear index accounted for approximately 58% of the volumetric wear variation while adjusted sliding distance and duration in vivo accounted for approximately 35% of the volumetric wear variation in the Archard model. Patient weight (p = 0.750), patient BMI (p = 0.680), and backside area (p = 0.784) of the tibial insert were all found to be non-significant in the Wang model. Similarly, patient weight (p = 0.233), patient BMI (p = 0.162), and backside area (p = 0.796) were found to be non-significant in the Archard model. Multidirectional micro-motion appears to contribute significantly to the wear of these components, supporting the Wang theory of cross-shear for polyethylene wear. Cross-shear of polymers on an unpolished titanium tray can lead to an increase in wear debris in the body. Care should be taken when designing locking mechanisms and tray designs. © 2016 Orthopaedic Research Society. Published by Wiley Periodicals, Inc. J Orthop Res 34:1933-1940, 2016.

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“…Ennek a ténye-zőnek a nagyságát általában 0 és 40% között alkalmazzák pin-on-disc, ball-on-disc vagy térdszimulátoron végzett tribológiai tesztek során. [7][8][9][10] Ciklikus tesztek alatt ennek a té-nyezőnek a nagyságát mindig állandónak tekintik McGloughlin és Kavanagh, 11 valamint Hollman és m.társai 12 tanulmányai alapján. McGloughlin és Kavanagh 11 kutatásai alapján az állandó csúszva-gördülési tényező használata abban az esetben ajánlott, ha egyszerű geometriájú felületek közötti kapcsolatot tekintünk, mint például a pin-on-disc és ballon-disc típusú tesztek.…”

Section: Bevezetésunclassified

Mechanical model for estimating wear in tibio-femoral connection in total knee replacements

Fekete¹,

Bíró²,

Csizmadia³

2017

biomech hung

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AbsztraktA kopás olyan mechanikai faktor, amely az térdízületi implantátumok élettartamát legjelentő-sebben befolyásolja. Implantátumok esetében a kopás vizsgálatához különböző berendezésekkel (pin-on-disc, térd szimulátor) kísérleteket végeznek, amely kísérletekben több paraméter mellett, állandó csúszva-gördülési tényezőt alkalmaznak. Az utóbbi években megjelent cikkek alapján, több szerző cáfolja azt az állítást, hogy az állandó csúszva-gördülési tényező megfelelő lenne a modellezésnél. Ez a térdízület kapcsolódó geometriájának bonyolultságával indokolható, ami miatt a lokális kinematika is túl komplexé válik az ilyen egyszerű feltétel alkalmazhatóságához. Ebben a tanulmányban, a csúszva-gördülés változásának hatását kívánjuk bemutatni egy jól ismert mechanikai kopás modellen, az ún. Archard modellen. A modell által kimutathatóvá válik, hogy a kopás a korábbi eredményekkel ellentétben, 10% túlbecsült a 0 és 60 behajlítási fok közé eső tartományban, járás során, míg 65% alulbecsült a 0-120 behajlítási fok közé eső tartományban, guggolás során. Kulcsszavak: kopás, térd, járás, guggolás, Archard modell, csúszva-gördülés Mechanical model for estimating wear in tibio-femoral connection in total knee replacements AbstractWear is considered the main mechanical factor that limits the lifetime duration of total knee replacements (TKRs). Among several parameters during wear experiments, constant slide-roll ratio (S/R ratio) is frequently applied during pin-on-disc tests and knee simulators. However, several papers showed that the idea of constant S/R ratio is not a proper approach if TKR wear is modelled due to the complex geometry. In this study, the significant effect of S/R on wear is demonstrated by involving a flexion angle dependent S/R ratio into Archard's law during gait and squat motion. By including this new parameter, it is demonstrated that the earlier models with constant S/R ratio overestimated wear by approximately 10% from 0 to 60 degree of flexion angle during gait, while underestimated it by approximately 65% from 0 to 120 degree of flexion angle during squat.

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

Cited by 28 publications

References 32 publications

In vitro wear simulation on the RandomPOD wear testing system as a screening method for bearing materials intended for total knee arthroplasty

In vitro wear simulation on the RandomPOD wear testing system as a screening method for bearing materials intended for total knee arthroplasty

Contribution of micro‐motion to backside wear in a fixed bearing total knee arthroplasty

Mechanical model for estimating wear in tibio-femoral connection in total knee replacements

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