Wear and friction of thin, large-diameter acetabular liners made from highly cross-linked, vitamin-E-stabilized UHMWPE against CoCr femoral heads

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Abstract

The experience of hip resurfacing with an ultra-high molecular weight polyethylene (UHMWPE) acetabular cup in the 1970s and 1980s was disappointing, partly because of the inadequate material properties of UHMWPE at the time. The use of state-of-the-art, vitamin-E-stabilized, highly cross-linked polyethylene, VEXLPE, should improve implant survivorship due to its advanced wear and oxidation resistance. Experimental, metal-backed VEXLPE liners of 4.0 mm thickness were wear and friction tested against 54 mm diameter CoCr femoral heads. The tests were conducted in a multidirectional hip joint simulator with an optimal (45°) and a high (65°) abduction angle of the acetabular component. Calf serum was used as the lubricant. The VEXLPE liners showed reasonable wear and friction behavior. The wear was linear with wear rates of 8.5 ± 0.6 mg/106 cycles and 12.9 ± 0.3 mg/106 cycles at 45° and 65° abduction, respectively. Before the wear test, the frictional torque with both positions was 3.6 ± 0.3 Nm, and after the wear test, the frictional torques with 45° and 65° abduction were 2.6 ± 0.3 Nm and 2.4 ± 0.6 Nm, respectively. The mean wear rate was 1.9-fold lower than that of a conventional total hip prosthesis, whereas the mean frictional torque was 1.7-fold higher.

Details

Original languageEnglish
Article number202948
Number of pages6
JournalWear
Volume432-433
Publication statusPublished - 15 Aug 2019
MoE publication typeA1 Journal article-refereed

    Research areas

  • Cross-linked UHMWPE, Hip resurfacing, Hip simulator, Prosthetic design, Vitamin E stabilization

ID: 35759551