Location or size? A finite element analysis study of necrotic lesion impact on femoral head collapse.

Results Von Mises stresses and displacements for the ONFH models with the same necrosis volume ratio Von Mises stresses and displacements for different LPA models when APA is 60.5° In the ONFH model with the same necrosis volume ratio, the stress concentration phenomenon of the model was most obvious when the LPA was 45.5°, and the von Mises stress on the femoral head surface and necrotic lesion as well as the femoral head displacement were the largest in the models; with the gradual increase of the LPA, the values of the above indexes of the model showed a decreasing trend.

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