Total Hip Arthroplasty

Karl Knahr completed his medical studies at the University of Vienna in 1971 and subsequently trained as an orthopaedic surgeon at the Orthopaedic University Clinic of Vienna. In 1988 he became Head of the 2nd Orthopaedic Department at the Orthopaedic Hospital, Vienna-Speising and in the following year he was appointed Professor of Orthopaedic Surgery at the University of Vienna. For more than a decade, Professor Knahr has been the Austrian National Delegate to SICOT (Société Internationale de Chirurgie Orthopédique et de Traumatologie), President and current Treasurer of the Austrian Society for Orthopaedic Surgery, and Austrian National Delegate to EFORT. Since 2005 he has been a member of the EFORT Executive Committee. He is currently a member of the editorial boards of International Orthopaedics and the Archives of Orthopaedic and Trauma Surgery and previously served as an editorial board member for the Journal of Arthroplasty. Professor Knahr has published widely on the subjects of tribology and hip arthroplasty.

Introduction: Tribology of hip prostheses - wear performance and reliability - effect of materials and head size.- How to treat failures related to articulation. Polyethylene articulations: Oxidation prevention with vitamin E in a HXLPE isoelastic monoblock pressfit cup - Preliminary results.- In-Vitro Wear Testing of Conventional vs. Sequentially Cross-Linked Polyethylene Liners in Combination with Different Ceramic Femoral Heads.- Characterization of Vitamin E-blended UHMWPE for higher in vivo performance in orthopaedic arthroplasty.- Long-term reduction of wear and osteolysis with crosslinked PE? 13-years follow-up of a prospectively randomized comparison with conventional PE. Metal articulations: Metal-on-metal bearings in hip surgery: The London Implant Retrieval Centre Experience.- Total Hip Arthroplasty with a large diameter metal-on-metal cup (Durom) and a standard stem - Short term results.- Polyethylene wear in metal-backed cups - A retrospective analysis of 200 uncemented metal-backed cups. Immunological adverse reaction associated with low carbide content metal-on-metal bearings in a contemporary cementless total hip arthroplasty. Ceramic articulations: Fracture and squeaking in ceramic-on-ceramic bearings - is it really a concern?- Long term stability of ceramic composite in total hip arthroplasty.- Ceramic-on-ceramic bearings in hip arthroplasty: a clinical review. Miscellaneous: Study of a titanium dual mobility socket with a mean follow-up of 18 years.- ECIMATM for low wear, good mechanical properties and oxidation resistance of hip bearings.