The Effect Of Cemented Femoral Stem Cross-section Geometry
In Total Hip Replacement
Author(s)
A. Ramos, F. Fonseca & J. A. Simões
Abstract
The effect of cemented femoral stem crosssection
geometry in total hip replacement
Abstract
This paper describes the finite elenlent analysis on the effect of stem crosssectional
geometries on stresses generated at the bone-cement and cement-stem
interfaces. A simplified numerical model of the implanted femur was used. were
the feni~u- uas n~odelled as a tubular structure and the femoral coniponent
niodelled as an extruded beam. -411 materials were assumed isotropic and linearly
elastic. The cross-sections \n,ere assumed symmetric about the medial-lateral
axis. A layer of constant thickness of cement was interposed between the stem
and the femoral cortex and a complex system of forces and moments generated
by the hip joint contact force was applied. Maxinlum and minimum principal
stresses were determined for twelve different cross-sectional geometries. The
results show that organic type geometries provoke, comparatively, lower tensile
and conlpression stresses. Rigid (shaip) geometries and cross
Keywords
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