Featured Publications & Reports

91 - 95 of 128    Prev | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | Next

Load Sharing, Bone Screw Interaction and Stress in CFR-PEEK Lumbar Spine Constructs

The aim of this study is to develop a refined block fixation FE model to investigate the load sharing, bone screw interaction, and stresses and strains in a CFR PEEK lumbar spine construct. The results of this FE study indicate that for the Ti and CFR-PEEK screw, the disc expierences the least strain with the Ti rod and the greatest strain with the PEEK rod. Due to its enhanced mechanical strength, the CFR-PEEK rod sustained comparable loads compared with the Ti rod and experienced less deformation than the PEEK rod.

2009 SFB Workshop Invited Presentation: Incorporating Hydroxyapatite and Porosity in PEEK for Orthopaedic and Spine Applications

Ryan Roeder from the University of Notre Dame has reviewed the techniques of incorporating HA and porosity into PEEK for orthopedic and spinal applications. Bioactivity has been conferred to PEEK by the incorporation of calcium phosphate, typically hydroxyapatite (HA) but also Bioglass and tricalcium phosphate, as a coating or filler. Coatings have been applied directly using plasma spray or indirectly using surface treatment to induce apatite deposition in simulated body fluid. A larger number of investigations have studied the use of calcium phosphate fillers to reinforce PEEK. PEEK biomaterials offer a wide variety of opportunities for basic research and product development, which span across materials processing, nano- and microstructural characterization, surface engineering, mechanical behavior, implant design and osteointegration.

2009 SFB Workshop Presentation: Exploring the Wear of a PEEK All-Polymer Articulation for Spinal Applications

PEEK the structural strength and stiffness to provide a stable implant-bone interface.  Thus, it is a good candidate for an all-polymer cervical disc replacement. Initial pin-on-plate wear of PEEK-PEEK pairings has been surprisingly low. The purpose of the present study was to further explore the wear behavior of various PEEK-PEEK pairings, looking for governing principles and tribological limits in order to assess the risk of gross surface damage and/or wear particle-induced osteolysis. Although an all-polymer PEEK implant for cervical disc arthroplasty would be advantageous in terms of medical imaging, the present study suggests that it might also have some tribological risks that need to be addressed in future simulator studies.

2009 SFB Workshop Presentation: In Vitro Analysis of Novel Porous PEEK Orthopedic Biomaterial

Because PEEK is inert and non-porous, the material has suffered from low cell adhesion and lack of cellular ingrowth. A new porous form of the PEEK thermoplastic with approximately 25% porosity and pores ranging up to 200 microns in diameter has been produced. Researchers from the University of Oklahoma have evaluated this new material through in vitro culture with rat mesenchymal stem cells (MSCs), to assess cellular interactions and differentiation. Scanning electron microscopy (SEM) was also used to assess the morphological state of cells during osteogenic differentiation.

2009 SFB Workshop Presentation: Plasma Spray Deposition of Titanium and Hydroxyapatite on PEEK and CFR-PEEK

Few details have been reported on the mechanical properties of Ti- and Hydroxyapatite-coated medical grade PEEK. In this study from the University of Trento, researchers investigated the influence of plasma spraying on the tensile and flexural properties of PEEK and CFR-PEEK. In order to distinguish the effects induced by sandblasting, representing the first step of plasma spray coating process, mechanical characterization has been carried out also on a set of sandblasted PEEK and CFR-PEEK specimens. Scanning electron microscope (SEM) analysis and adhesion measurements of the coatings were carried out in order to characterize the coatings.

Visit our Resources section for more background reading.

91 - 95 of 128    Prev | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 | Next