Assessment by finite element analysis of the impact of osteoporosis and osteoarthritis on hip resurfacing

Engineers Australia
Publication Type:
Conference Proceeding
Proceedings of the 5th Australasian Congress on Applied Mechanics (ACAM 2007), 2007, pp. 271 - 276
Issue Date:
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Hip resurfacing is proposed as an alternative to total hip replacement (THR) for treatment of osteoarthritis (OA), especially for younger, heavier and more active sufferers. There is however, concern with regards to the incidence of post operative femoral neck fractures. We have investigated, with finite element models, the changes in stress and strain in the femoral neck following hip resurfacing. We have included several different bone material property values representing normal, elderly, osteoarthritic and osteoporotic bone. We have also modelled two different hip implant orientations. We have shown that hip resurfacing may increase the magnitude of stress and strain in the femoral neck, especially in osteoporotic bone. We have also shown that the superolateral offset associated with the valgus orientation, not the valgus orientation itself, may be what reduces the stress and strain in the neck and leads to lower incidence of fracture.
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