Featured Publications & Reports

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Biotribology of HXLPE on PEEK Bearings

Little is known about the biotribology of all-polymer PEEK bearings. Researchers from Philadelphia simultaneously tested a total of 100 pin-on-disk couples (n = 10 per bearing couple) consisting of three traditional metal-on-UHMWPE and seven polymer-on-polymer bearings for 2 million cycles under physiologically relevant conditions per ASTM F732. The combined wear rates of all-polymer bearing couples were not different than traditional bearing couples. The data suggest that all-polymer bearings, especially PEEK-on-HXLPE bearing couples, may represent a viable alternative to traditional bearings with respect to their wear performance.

Noteworthy in 2016: PEEK Femoral Components for TKA and Stress Shielding

A polyetheretherketone (PEEK) femoral implant has the potential to promote bone strains closer to that of natural bone as a result of its low elastic modulus compared with cobalt-chromium (CoCr). Researchers from Leeds have performed an in vitro study to determine the effect of a PEEK femoral component on local bone strains. Results of this study suggest that the strain shielding observed with the contemporary CoCr implant, consistent with clinical bone mineral density change data reported by others, may be reduced by using a PEEK implant.

Systematic Review on Biological Response of PEEK Wear Particles

Researchers from the University of Leeds performed a systematic review of the literature related to the biological response of PEEK wear particles. They found that wear particles produced by PEEK-based bearings were, in almost all cases, in the phagocytozable size range (0.1-10 microm). The studies that evaluated the biologic response to PEEK-based particles generally found cytotoxicity to be within acceptable limits relative to the UHMWPE control, but inconsistent when inflammatory cytokine release was considered.

Bone Formation with PEEK/HA Composites in a Sheep Fusion Model

Researchers from Prince of Wales Hospital in Australia investigated bone ongrowth and fusion outcomes of PEEK/HA as compared with natural PEEK in a cervical fusion model. Incorporating HA into the PEEK matrix resulted in more direct bone apposition as opposed to the fibrous tissue interface with PEEK alone in the bone ongrowth as well as interbody cervical fusions. No adverse reactions were found at the implant-bone interface for either material.

Noteworthy in 2016: Material Model for PEEK under High Temperature Processing Conditions

Researchers have developed a modified Johnson-Cook (JC) model to describe the flow behaviour of polyether-ether-ketone (PEEK) with the consideration of coupled effects of strain, strain rate and temperature. As compared to traditional JC model, the modified one has better ability to predict the flow behaviour at elevated temperature conditions that are encountered during polymer processing. In particular, the yield stress was found to be inversely proportional to temperature from the predictions of the proposed model. Click here to see a brief commentary by the Editor of the PEEK Lexicon.

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