Role of cyclic plastic deformation in the wear of UHMWPE acetabular cups

Wang, A.; Stark, C.; Dumbleton, J. H.

doi:10.1002/jbm.820290509

Cited by 76 publications

(31 citation statements)

References 20 publications

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“…15,16 Similar machines are in use in a number of laboratories. [17][18][19] To stabilize the test conditions, the specimens were run for 1 million cycles before the temperatures were recorded. The wear rates of the cups, measured by weight loss during the interval from 0.5 to 1.0 million cycles, were comparable to those of a previous study 20 for each of the three material combinations.…”

Section: Methodsmentioning

confidence: 99%

Potential thermal artifacts in hip joint wear simulators

McKellop

Liao

et al. 1999

J. Biomed. Mater. Res.

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Frictional heat was monitored during wear tests of ultrahigh molecular weight polyethylene acetabular cups bearing against femoral balls of metal or ceramic in a hip simulator, using bovine serum as a lubricant. About 1 to 2 h of continuous cycling were required for the temperature in the zone of contact between the cup and ball to rise to its maximum steady value, and this equilibrium temperature was markedly higher with increased load and/or cycling rate. Frictional heating caused substantial precipitation of the proteins from the serum and, in some of the tests running at 1.5 or 2 Hz, an adherent proteinaceous layer was observed attached to the surface of the balls. The maximum temperature was also substantially higher in tests run with the cup mounted above the ball rather than below. Surprisingly, the tests running at higher frictional torque and temperature (i.e., those with the most protein precipitation and/or adherent layers) produced the least wear of the polyethylene. This might have been due to the solid proteins that formed a protective layer between the ball and cup. Because patients with hip prostheses typically do not walk for hours without rest, the maximum temperatures in vivo are likely to be much lower than those reached in the hip simulator. Therefore, the affects of protein precipitation on the resultant wear properties of the materials should be considered potential artifacts of the hip simulator tests. Increasing the volume of the lubricant bath reduced the maximum temperatures for tests running at 1.5 Hz but had little affect at 2 Hz. Reducing the cycling rate is an effective way to avoid overheating of the specimens, but this necessarily extends the time required to complete a test.

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Section: Methodsmentioning

confidence: 99%

Potential thermal artifacts in hip joint wear simulators

McKellop

Liao

et al. 1999

J. Biomed. Mater. Res.

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“…Machining of UHMWPE implants consists in milling and turning operation for both roughing and finishing steps [40]. Changes to the surface roughness of the implants can affect the initial wear rate due to removal of machining marks, which will occur within the contact zone during the first stages of wear [41]. It is well known that the debris generated from the UHMWPE socket may cause adverse tissue biological reactions leading to bone loss or osteolysis.…”

Section: Polymers Compositesmentioning

confidence: 99%

Advanced biomaterials in hip joint arthroplasty. A review on polymer and ceramics composites as alternative bearings

Affatato

Ruggiero

Merola

2015

Composites Part B: Engineering

138

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“…In previous studies, the generation of wear particles in acetabular components has been associated with the local accumulation of plastic strain under multiaxial loading conditions [9,10], while in tibial components the fatigue and fracture mechanisms have been directly related to the plastic flow parameters of UHMWPE, such as the yield stress and ultimate stress [11].…”

Section: Introductionmentioning

confidence: 99%