|Position:||Ortopedic consultant , MD, PhD|
Jon Dahl, MD is an orthopaedic surgeon whos main interest is hip and knee replacements.
The title of his Ph.D project is: ”Wear and osteolysis in total hip replacements”. Supervisors on the project are: Stephan M. Röhrl MD, Ph.D, Finnur Snorrason MD, Ph.D and Professor Lars Nordsletten MD, Ph.D. Project started 2007 and will be finished 2012/13.
About the project:
We study difference in polyethylene-wear and osteolysis around acetabular cups between ceramic (Alumina) and metal (Cobalt-Chrome) heads in total hip arthroplasty. We have followed three different patient materials from randomised trials for ten years with radiostereometry (RSA). The results from two of the materials show more than 50 % reduced wear with ceramic heads compared to metal heads. The analyses from the last material are not finished. With regard to development of osteolysis around the cups we have not found any significant differences, but there is a tendency towards more bone loss with metal heads. We have developed a new method for wear measurement with RSA. This method allows wear measurement with RSA without index RSA radiographs.
Low wear, high stability - promises of success in a moderately cross-linked cup?
Hip Int, 25 (3), 199-203
More than 50% reduction of wear in polyethylene liners with alumina heads compared to cobalt-chrome heads in hip replacements: a 10-year follow-up with radiostereometry in 43 hips
Acta Orthop, 84 (4), 360-4
Center index method-an alternative for wear measurements with radiostereometry (RSA)
J Orthop Res, 31 (3), 480-4
10-year results of a new low-monomer cement: follow-up of a randomized RSA study
Acta Orthop, 83 (6), 604-8
Radiostereometric analysis of hemiarthroplasties of the hip--a highly precise method for measurements of cartilage wear
Osteoarthritis Cartilage, 20 (1), 36-42