- 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.
Higher cartilage wear in unipolar than bipolar hemiarthroplasties of the hip at 2 years: A randomized controlled radiostereometric study in 19 fit elderly patients with femoral neck fractures
Acta Orthop, 89 (5), 503-508
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
Reverse hybrid and cemented hip replacement compared using radiostereometry and dual-energy X-ray absorptiometry: 43 hips followed for 2 years in a prospective trial
Acta Orthop, 83 (6), 592-8
10-year results of a new low-monomer cement: follow-up of a randomized RSA study
Acta Orthop, 83 (6), 604-8
Less wear with aluminium-oxide heads than cobalt-chrome heads with ultra high molecular weight cemented polyethylene cups: a ten-year follow-up with radiostereometry
Int Orthop, 36 (3), 485-90
Radiostereometric analysis of hemiarthroplasties of the hip--a highly precise method for measurements of cartilage wear
Osteoarthritis Cartilage, 20 (1), 36-42