title: Micromotion and friction evaluation of a novel surface architecture for improved primary fixation of cementless orthopaedic implants.
abstract: A new surface architecture (OsteoAnchor) for orthopaedic stem components has been developed, which incorporates a multitude of tiny anchor features for embedding into the bone during implantation. It was tested for its ability to provide improved primary fixation compared to existing surface coatings. Friction testing was performed on bovine trabecular bone. It was found that OsteoAnchor provided up to 76% greater resistance to transverse motion under simultaneous normal loading compared to the porous tantalum. Micromotion testing was performed on stem components implanted in cadaver ovine femurs. The micromotion amplitudes for the OsteoAnchor stem were significantly lower than for a corresponding plasma sprayed stem. These results demonstrate that OsteoAnchor has the potential to provide improved primary fixation for stem components in joint replacement operations.
authors: Mechanical and Biomedical Engineering, National University of Ireland, Galway, Ireland.
authors: N
authors: N
authors: Harrison
authors: P E
authors: PE
authors: McHugh
authors: W
authors: W
authors: Curtin
authors: P
authors: P
authors: Mc Donnell
mesh_terms: D000268:Adhesiveness; D000818:Animals; D019644:Arthroplasty, Replacement, Hip / Q000379:methods*; D002484:Cementation; D020099:Coated Materials, Biocompatible / Q000737:chemistry*; D019544:Equipment Failure Analysis; D017276:Friction; D006622:Hip Prosthesis; D066298:In Vitro Techniques; D008422:Materials Testing; D009038:Motion; D011474:Prosthesis Design; D012756:Sheep; D013499:Surface Properties
chemical_list: D020099:Coated Materials, Biocompatible