Featured Publications & Reports

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Plasma Immerson Ion Implantation Treatment of Poly-Ether Ether Ketone For Surface Biofunctionalization

The aim of this project is to study the effects of the Plasma Immersion Ion Implantation (PIII) treatment on PEEK and explore methods of achieving improved bone cell responses by changing surface properties with PIII as well as using PIII to bio-functionalize PEEK surfaces with bone matrix proteins.

Frictional Heating of PEEK-UHMWPE Bearing Couple on Pin-on-disk Tester

Heat generated during elliptical Pin-on-disk articulation of UHMWPE-PEEK and UHMWPE-CoCr bearing couples, lubricated by either bovine serum or water on a Pin-on-disk, was characterized using an approach previously investigated for TKA by Lu and McKellop. We hypothesized that, at steady state, heat generated by articulation would not differ between UHMWPE-PEEK and UHMWPE-CoCr bearing couples. We also hypothesized that the coefficient of friction at steady state would be similar for both bearing couples when lubricated by either bovine serum or water.

Semi-Rigid Posterior Fixation: PEEK Rod Design, Rationale and Use

This presentation addresses the state of the art of PEEK rods employed in lower lumbar posterior fixation.

Characterization of In vivo Changes and Histological Repsonses of Retrieved PEEK Rod Spinal Systems

This study characterizes the surface damage mechanisms, curvature variations, crystallinity changes and histological responses of retrieved PEEK rods used in posterior spinal instrumentation. We hypothesized that PEEK rods would undergo permanent deformation and crystallinity changes while maintaining histological inertness in vivo.

Smart Modiciation of PEEK by Self-Inhitiating Surface Graft Polymerization for Orthopedic Bearings

In this study, we have demonstrated the fabrication of a highly hydrophilic and biocompatible nanometer-scale modified surface by the photoinduced graft polymerization of 2- methacryloyloxyethyl phosphorylcholine (MPC). The new and safer polymerization system is called “selfinitiated surface graft polymerization.” We hypothesize that the cartilage-like surface obtained by the surface modification of biocompatible poly(MPC) (PMPC) exhibits excellent biocompatibility and hydrophilicity under physiological conditions.

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