A dynamic canine model of experimental hip dysplasia. Gross and histological pathology. and the effect of position of immobilization on capital femoral epiphyseal blood flow


ABSTRACT: We produced a dynamic model of ex-perimental hip dysplasia in growing puppies by cast im-mobilization of a single hind leg with the knee in extension. Serial roentgenographic studies demonstrated a progressive acetabular dysplasia with subluxation and eventually dislocation of the femoral head. A consistent finding in the dysplastic hip was significant hypertrophy of the ligamentum capitum femoris, both in length and in cross-sectional area. Quantitative studies of blood flow in the femoral head by the hydrogen-washout technique in normal and dysplastic hips demonstrated a significant decrease in blood flow to the dysplastic femoral heads. The dys-plastic hips were then placed in various positions of im-mobilization and blood-flow determinations were re

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