[Hemodynamic study of the idiopathic necrosis of femoral head--using super-selective angiography].

The aim of this study was to investigate the hemodynamic change in the idiopathic necrosis of femoral head. Super-selective angiography was performed on 56 affected hips. The changes of blood supply from its initial stage to the final stage were carefully studied and the results were compared with pathological findings. The super-selective angiography was performed also on 13 normal hips and 23 hips with osteoarthritis for comparison. The impairment of the hemodynamics was observed in the retinaculum of superior retinacular arteries by the super-selective angiography. When the numerous superior retinacular arteries branched off from the posterior collum branch and some of them remaining intact, the latter arteries grew in their diameter with consequent increase of the blood supply through them. When the single superior retinacular artery branched off from the posterior collum branch, the blood supply did not increase. It was assumed that the factors affecting idiopathic necrosis of the femoral head include the time of occurrence of revascularization, the degree of revascularization and the decrease of blood supply at the time of the hip movement.