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KMID : 0386719940060020172
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Journal of the Korean Hip Society
1994 Volume.6 No. 2 p.172 ~ p.180
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A Finite Element Analysis of Stress Shielding and Bone Resorption of Proximal Femur after Total Hip Replacement.
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Abstract
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Bone resorption in the cortex of proximal femur is often seen postoperatively on X-ray or bone densitometry after total hip replacement in the form of cortical osteoporosis or thinning.
The author developed 2-dimensional finite element models of cemented and non-cemented type and 2-dimensional side plate model of non-cemented implanted femoral stem, and studied the stress shielding phenomenon with the effect of the
various degree of bone resorption to the cortex of femur.
The results of the present finite element analysis indicated that stress shielding occured primarily on the proximal medial femur and in lesser degree on the proximal lateral femur around femoral stem, and much severe in
non-cemented
stem than cemented stom.
The extent of proximal bone resorption had the adverse effect of more increasing stresses on the lateral cortex and more decreasing stresses on the medial cortex around the stem, and clinically these results closely related with increasing
chance
of thigh pain and loosening of stem.
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