Prosthesis design and stress profile after hip resurfacing: a finite element analysis.

Abstract:

PURPOSE:To evaluate the effect of prosthesis design on stress profile in the proximal femur after hip resurfacing. METHODS:The von Mises stress profile of the native femur was simulated and compared with that of resurfaced femurs using various prosthetic materials (titanium, cobalt-chrome, ceramic), stem lengths (normal, half, short, and no stem), and femoral head coverage (shell size) [260 degrees, 220 degrees, 180 degrees, and 140 degrees]. RESULTS:Hip resurfacing altered the stress profile of the cancellous (but not cortical) bone of the femoral neck. Maximal cortical stresses were observed at the posterior half of the medial femoral neck. The stress profile of the native femur was most similar to that of the resurfaced femur made of titanium, with a short or no stem and 260 degrees of femoral head coverage (shell size). CONCLUSION:Optimising prosthesis design by minimising biomechanical alterations seems a valid approach to achieving favourable long-term outcomes. Cadaveric and in vivo studies are needed to confirm the clinical relevance and feasibility.

authors

Heijink A,Zobitz ME,Nuyts R,Morrey BF,An KN

doi

10.1177/230949900801600312

subject

Has Abstract

pub_date

2008-12-01 00:00:00

pages

326-32

issue

3

eissn

1022-5536

issn

2309-4990

journal_volume

16

pub_type

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