Featured Publications & Reports

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MD&M 2010 Presentation: Design of PEEK Orthopaedic Bearings

Jim Nevelos, Ph.D., from Stryker Orthopedics provides an overview of the development of the first CFR-PEEK bearings for hip replacement currently under clinical trial. All contemporary orthopaedic bearings have issues with wear, wear debris, noise generation, and fracture risk. PEEK has great promise as a bearing material, although the ideal formulation and design has proven elusive.

MD&M 2010 Presentation: Design and Development of the Epoch Stem

This MD&M Minneapolis presentation by Mike Hawkins describes the development process of the first PEEK hip stem in orthopedics. The Epoch hip stem was developed, evaluated in the labs and clinically tested from 1985 to 2001 when it was commercialized. The effort required the work of many people inside and outside of Zimmer. The Epoch represents a pioneering use of PEEK and other materials in a novel application that has been clinically successful.

MD&M 2010 Presentation: Design of Bioactive PEEK Composite Implants

This MD&M Minneapolis presentation by Prof. Ryan Roeder highlights recent investigations in the design of hydroxyapatite (HA) whisker reinforced polyaryletherketone biocomposites. Novel powder processing and compression molding methods enabled the dispersion of high volume fractions of HA reinforcements and the addition of a tailored porosity. Single crystal HA whiskers enabled improved load-transfer from the matrix to reinforcement, resulting in significantly improved static and fatigue properties when directly compared to equiaxed powder reinforcements, and often mimicking the elastic properties cortical and trabecular bone.

MD&M 2010 Presentation: Metal and HA Coating Technologies for PEEK Implants

In order to improve the bone-implant interface, PEEK implants may be coated with Titanium (Ti) or Hydroxyapatite (HA) via Plasma Spray (PS) processes. Coatings characterization was performed by SEM analyses, profilometry and optical image analyses. Basic data as bulk surface covering capability, coating porosity, coating roughness and thickness were collected along with adhesion strength coating-substrate. A properly designed and applied plasma spray process is able to coat PEEK or CFR-PEEK components with potentially improved bone apposition without damaging the substrate’s properties and the coating reliability.

MD&M 2010 Presentation: Material Selection Criteria and Injection Molding of PEEK

This MD&M Minneapolis presentation by Ken Kostecki covers both grade selection and processing of implantable PEEK materials.Numerous physcial, mechanical, and processing requirements, as well as application driven properties must be considered in seleting the proper grade of PEEK. This portion of the presentation identifies these considerations in order to guide those specifying materials to an informative material decision. The second part of the presentation provides an overview of key PEEK processing considerations that will help guide those producing implantable PEEK components around common pitfalls, and will aide in successful manufacturing.

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