Novel Surface Modifications of Carbon Fiber-Reinforced Polyetheretherketone Hip Stem in an Ovine Model
Nicky Bertollo
Surgical and Orthopaedic Research Laboratories, Prince of Wales Hospital, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorWilliam R. Walsh
Surgical and Orthopaedic Research Laboratories, Prince of Wales Hospital, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorCorresponding Author
Nobuhiko Sugano
Department of Orthopaedic Surgery
Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine, Suita
Prof. Nobuhiko Sugano, Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan. E-mail: [email protected]Search for more papers by this authorNicky Bertollo
Surgical and Orthopaedic Research Laboratories, Prince of Wales Hospital, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorWilliam R. Walsh
Surgical and Orthopaedic Research Laboratories, Prince of Wales Hospital, University of New South Wales, Sydney, NSW, Australia
Search for more papers by this authorCorresponding Author
Nobuhiko Sugano
Department of Orthopaedic Surgery
Department of Orthopaedic Medical Engineering, Osaka University Graduate School of Medicine, Suita
Prof. Nobuhiko Sugano, Department of Orthopaedic Surgery, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita, Osaka 5650871, Japan. E-mail: [email protected]Search for more papers by this authorAbstract
A carbon fiber-reinforced polymer (CFRP) is theoretically a suitable material for use in an uncemented hip prosthesis considering it can provide isoelastic environment with the surrounding bone, adequate fatigue strength, and a metal-free radiographic evaluation. To date, the selection of polymer material and optimization of both design and surface finish of the prostheses for osseointegration has not been accomplished. This study examined radiographic and histologic results of an uncemented CFRP stem manufactured from carbon fiber-reinforced polyetheretherketone (CFR/PEEK) with a roughened surface and a bioactive treatment in an adult ovine model following a 12-month implantation period. A unilateral hemiarthroplasty of the hip was performed using the CFRP stem or a titanium stem as a control. Four cases with the CFRP stem and five cases with titanium stem were evaluated. Bone on-growth fixation was achieved in two cases with the CFRP stem and in all the cases with the titanium stem. The CFRP cases showed minimal stress shielding while three of five cases with the titanium stem demonstrated typical osteopenia associated with stiff metal stems. Bone on-growth to the uncemented CFRP stem was achieved by using the CFR/PEEK for the material and modifying the surface design and the bioactive surface finish. Bone resorption and osteopenia observed with the Ti stems was not found with the CFRP design.
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