Featured Publications & Reports

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Pin-on-Plate Tribological Studies of CoCrMo Alloys with CFR-PEEK

In this study, researchers from Durham University used a multidirectional pin-on-plate wear test apparatus to investigate the tribological behavior of CFR-PEEK articulating against various CoCrMo alloys. The PEEK/low carbon CoCrMo produced the highest wear. CFR-PEEK against high carbon or low carbon CoCrMo provided low wear factors. Pin-on-plate tests performed on ultra-high molecular weight polyethylene (UHMWPE) against CoCrMo (using comparable test conditions) have shown similar or higher wear than that found for CFR-PEEK/CoCrMo.



Update on PEEK in Suture Anchors

This study by Barber et al provides a current update on the use of PEEK in suture anchors for arthroscopic joint repair. The purpose of the study was to evaluate recently introduced sutures and suture anchors for single pull load to failure strength and failure mode. The newer anchors showed markedly increased load to failure strengths. Two or more high-strength sutures are commonly used as well as new anchor materials (PEEK and Biocryl Rapide), new eyelet designs, and the increased use of a "knotless" concept.

 



Tribological assessment of a flexible CFR-PEEK acetabular cup

The study detailed here used a hip simulator to assess the volumetric wear rates of large-diameter carbon-fibre-reinforced pitch-based poly(ether-ether-ketone) (CFR-PEEK) acetabular cups articulating against alumina femoral heads. The average volumetric wear rate of the CFR-PEEK acetabular component of 54 mm diameter was 1.16 mm(3)/10(6) cycles, compared with 38.6 mm(3)/10(6) cycles for an ultra-high-molecular-weight polyethylene acetabular component of 28 mm diameter worn against a ceramic head. This extremely low wear rate was sustained over 25 x 10(6) cycles (the equivalent of up to approximately 25 years in vivo). The frictional studies showed that the joints worked under the mixed-boundary lubrication regime.



2008 WBC Conference Poster: Tribological Comparison of PEEK/PEEK, CFR-PEEK/CFR-PEEK and PEK/PEK Couplings

Wear tests were performed at Durham University on polymer-polymer wear couples incorporating polyetheretherketone (PEEK-OPTIMA), carbon fibre reinforced PEEK-OPTIMA (CFR-PEEK) and an alternative nonreinforced high molecular weight polyetherketone (PEK). Multi-directional pin-on-plate wear machines were used. Both the CFR-PEEK-OPTIMA articulating against CFR-PEEK-OPTIMA and the PEK bearing against PEK provided lower wear than standard PEEK-OPTIMA/PEEK-OPTIMA samples.



2008 WBC Conference Presentation: Plasma Spray HA Coating process for PEEK and CFR-PEEK

This work aims to investigate the mechanical properties modifications of PEEK and CFR-PEEK. Tensile and fatigue tests have been performed before and after the plasma spray (PS) coating process in order to understand the modifications in terms of elastic modulus, tensile strength and fatigue limit. A properly designed and applied HA plasma sparay process enabled the researchers to obtain CFR-PEEK components with potentially improved surface ostheoconductivity and modest tensile and fatigue properties modifications.


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