Biomechanical model of the shear stress distribution in the femoral neck

Blaž Mavčič, Miran Križančič, Oskar Zupanc, Aleš Iglič, Veronika Kralj-Iglič


Background and Purpose. The shear stress distribution in the femoral neck is an important biomechanical parameter in the development of slipped capital femoral epiphysis. In our work we present a simple non-invasive method for computation of the shear stress distribution in the femoral neck of an individual hip based on anterior-posterior pelvic radiograph.
Methods. A mathematical model of the resultant hip force is used and the shear stress tensor is computed according to the procedure for a loaded beam.
Results. Preliminary results from an illustrative set of three patients with slipped capital femoral epiphysis show that the collum-diaphysis angle, the femoral neck width and the resultant hip force have important influence on shear stress distribution.
Conclusion. Unfavorable high values of the resultant hip force can be compensated by larger collum-diaphysis angle and wider femoral neck. In further research the method could be used on a larger series of patients to determine the predictive value of the shear stress for different clinical outcomes.


Femoral Neck; Hip Biomechanics; Shear Stress; Slipped Capital Femoral Epiphysis;

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ISSN 1801-1217 (Print)
ISSN 1805-9422 (Online)
Published by the Czech Technical University in Prague, Faculty of Mechanical Engineering