The Importance of Multidirectional Motion on the Wear of Polyethylene

Bragdon, C.R.; O’Connor, Daniel; Lowenstein, Jay D.; Jasty, Murali; Syniuta, W.D.

doi:10.1243/pime_proc_1996_210_408_02

Cited by 258 publications

(131 citation statements)

References 24 publications

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“…Decreasing the quantity of protein in the lubricant can increase the wear rate of UHMWPE on CoCr and decrease the wear rate of PTFE on CoCr, but testing both in a zero protein fluid yields unrealistically low wear rates for both as compared to clinical retrieval analyses [17,18]. In addition, multidirectional or ''cross-shear'' motion can increase the wear rate by an order of magnitude [19][20][21][22] or not have an effect at all [23]. Moreover, a test frequency of 1 versus 2 Hz has been shown to yield a lower wear rate for hip arthroplasty devices [24], whereas the opposite effect has been seen in total disc replacements [25,26].…”

Section: Discussionmentioning

confidence: 99%

The use of self-mating PEEK as an alternative bearing material for cervical disc arthroplasty: a comparison of different simulator inputs and tribological environments

Brown

Bao

2012

Eur Spine J

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Purpose The hypothesis for this study was that the simulated wear behavior of a hydroxyapatite coated, selfmating PEEK cervical disc arthroplasty device would be dependent on the simulated testing environment. Methods Five groups of devices were evaluated under suggested ASTM and ISO load and motion profiles. The groups utilized different testing frequencies and protein content of simulator fluid, in addition to assessing the potential for third body wear. The average wear rates were determined using linear regression analysis with a generalized estimating equation. Significant differences between groups were determined using the Wald's test. Results The simulated wear behavior was shown to be highly dependent on the testing environment, where protein content more than decreasing the cyclic loading frequency resulted in increased wear, but was not dependent on the suggested load and motion profiles. It was demonstrated that a self-mating PEEK cervical disc arthroplasty device has wear rates that are similar to existing material combinations for cervical disc arthroplasty. Conclusions This study showed that at a time when data from retrieval analyses is deficient, it is important to test the wear resistance of cervical disc arthroplasty devices under various conditions. Long-term clinical results and ongoing implant retrievals are required for validation between clinical performance and simulator inputs.

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Section: Discussionmentioning

confidence: 99%

The use of self-mating PEEK as an alternative bearing material for cervical disc arthroplasty: a comparison of different simulator inputs and tribological environments

Brown

Bao

2012

Eur Spine J

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“…7,8,11 Simulator wear rates approaching clinical values were recorded under conditions of multidirectional motion 12 while near zero wear rates were recorded for unidirectional motion. 5,7 Variation of wear paths between total hip arthroplasty patients has recently been proposed as a factor that may influence the wear properties of the UHMWPE cup. 9 In a previous study involving a small number of patients (n ¼ 19), the authors found a positive correlation between both measurements of multidirectional motion and sliding distance experienced at the patients' hip joints and the wear.…”

mentioning

confidence: 96%

“…1,2 However, excessive wear of the ultrahigh molecular weight polyethylene (UHMWPE) acetabular component is one of the main causes of bone resorption, implant loosening, and ultimate failure of hip joint replacements. 3,4 Variation in the articulation patterns between the femoral head and the acetabular cup greatly influence wear rates in simulator tests [5][6][7][8] and computer models. 9 Unidirectional motion promotes orientation of the long polyethylene chains and subsequent hardening, 8 while multidirectional motion promotes an environment of continually changing shear.…”

mentioning

confidence: 99%

“…Consequently, unidirectional motion produces minimal wear rates while multidirectional motion produces greatly increased wear rates. 7,10 Indeed, unidirectional motion produces wear rates two orders of magnitude less than multidirectional motion. 7,8,11 Simulator wear rates approaching clinical values were recorded under conditions of multidirectional motion 12 while near zero wear rates were recorded for unidirectional motion.…”

mentioning

confidence: 99%

“…7,10 Indeed, unidirectional motion produces wear rates two orders of magnitude less than multidirectional motion. 7,8,11 Simulator wear rates approaching clinical values were recorded under conditions of multidirectional motion 12 while near zero wear rates were recorded for unidirectional motion. 5,7 Variation of wear paths between total hip arthroplasty patients has recently been proposed as a factor that may influence the wear properties of the UHMWPE cup.…”

mentioning

confidence: 99%

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The influence of wear paths produced by hip replacement patients during normal walking on wear rates

Bennett¹,

Humphreys²,

O’Brien³

et al. 2008

Journal Orthopaedic Research

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Variation in wear paths is known to greatly affect wear rates in vitro, with multidirectional paths producing much greater wear than unidirectional paths. This study investigated the relationship between multidirectional motion at the hip joint, as measured by aspect ratio, sliding distance, and wear rate for 164 hip replacements. Kinematic input from three-dimensional gait analysis was used to determine the wear paths. Activity cycles were determined for a subgroup of 100 patients using a pedometer study, and the relationship between annual sliding distance and wear rate was analyzed. Poor correlations were found between both aspect ratio and sliding distance and wear rate for the larger group and between annual sliding distance and wear rate for the subgroup. However, patients who experienced a wear rate <0.08 mm/year showed a strong positive correlation between the combination of sliding distance, activity levels, and aspect ratio and wear rate (adjusted r 2 ¼ 55.4%). This group may represent those patients who experience conditions that most closely match those that prevail in simulator and laboratory tests. Although the shape of wear paths, their sliding distance, and the number of articulation cycles at the hip joint affect wear rates in simulator studies, this relationship was not seen in this clinical study. Other factors such as lubrication, loading conditions and roughness of the femoral head may influence the wear rate. ß

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A multidirectional motion pin-on-disk wear test method for prosthetic joint materials

Saikko

1998

J. Biomed. Mater. Res.

112

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A realistic pin-on-disk wear test method for prosthetic joint materials has been developed. The new method, called circularly translating pin-on-disk (CTPOD), yields wear rates and wear mechanisms similar to those observed in retrieved polyethylene acetabular cups. In the established methods, where a polyethylene specimen slides against a unidirectionally rotating, or reciprocating, metallic or ceramic counterface, the wear rate typically is two orders of magnitude too low. In the present study, also, the reciprocator gave negligible wear. In the CTPOD method, considerable wear occurs because the direction of sliding rotates relative to the polyethylene pin, hence, the molecular orientation effect of polyethylene is avoided.

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The Importance of Multidirectional Motion on the Wear of Polyethylene

Cited by 258 publications

References 24 publications

The use of self-mating PEEK as an alternative bearing material for cervical disc arthroplasty: a comparison of different simulator inputs and tribological environments

The use of self-mating PEEK as an alternative bearing material for cervical disc arthroplasty: a comparison of different simulator inputs and tribological environments

The influence of wear paths produced by hip replacement patients during normal walking on wear rates

A multidirectional motion pin-on-disk wear test method for prosthetic joint materials

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