Featured Publications & Reports

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2010 EFORT E-Poster: Clinical Outcomes of PEEK-on-PEEK Cervical Total Disc Replacements

The purpose of this study was to assess the clinical and radiological outcome of single and multiple level anterior cervical decompression and disc replacement (ACDR) using new peek on peek (POP) cervical disc replacement prosthesis (NuNec™ Cervical Arthroplasty System, Pioneer Surgical Technology, München, USA). This report summarizes the 6-month follow up results, which were promising. Longer term follow-up is awaited.

2010 SFB Poster: PEEK Multifilament and Monofilament Woven Tissue Engineering Scaffolds

The aim of this work was to fabricate flexible woven PEEK scaffolds. Scaffolds were characterised in terms of their physical and mechanical properties and biologically assessed, culturing with L929 mouse fibroblasts for up to 16 days in vitro. Multifilament PEEK woven scaffolds were lighter, thinner and stronger than monofilament PEEK scaffolds. Woven PEEK scaffolds supported fibroblast cell attachment and proliferation, and ECM production. The results of this study indicate that fibrous PEEK structures have potential as scaffolds for tissue engineering.

Preparation and Tribological Properties of PEEK-UHMWPE Composites

Researchers from Nanjing University of Science and Technology have investigated PEEK composites filled with 20% UHMWPE to improve wear resistance. Tribological properties of PEEK-UHMWPE composites were investigated by block-on-ring friction and wear rig. An alloy (CoCrMo) ring and a ceramic (Si(3)N(4)) ring were used as friction pairs. The experiments were conducted under deionized water lubrication (DWL), saline lubrication (SL), and calf serum solution lubrication (CSSL). The results indicated that friction coefficients and wear of PEEK/UHMWPE composites were effectively reduced when compared with pure PEEK.

Evaluation of CFR-PEEK Dental Implants using Finite Element Analysis

The aim of this study was to compare, using the three-dimensional finite element method, the stress distribution in the peri-implant support bone of distinct models composed of PEEK components and implants reinforced with 30% carbon fiber (30% CFR-PEEK) or titanium. In simulations with a perfect bonding between the bone and the implant, the 30% CFR-PEEK presented higher stress concentration in the implant neck and the adjacent bone, due to the decreased stiffness and higher deformation in relation to the titanium. However, 30% CFR-PEEK implants and components did not exhibit any advantages in relation to the stress distribution compared to the titanium implants and components.

2010 ORS Poster: Self-Initiated Surface Graft Polymerization of PMPC on PEEK

Researchers from the University of Tokyo have developed and characterized highly hydrophilic and biocompatible nanometer-scale modified PEEK and CFR-PEEK by graft polymerization of poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC). The wettability of PMPC-grafted PEEK was considerably greater than that of the untreated PEEK, because of the presence of a nanometer-scaled PMPC layer. A significant reduction in static water-contact angle of PMPC-grafted PEEK resulted in a substantial improvement in frictional behavior. In addition, the amount of adsorbed proteins on the PMPC-grafted PEEK was considerably lower than that of the untreated PEEK.

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