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L'osteonecrose aseptique de hanche (OAH) evolue le plus souvent selon les quatre stades d'Arlet et Ficat<space>: radiographie normale tout d'abord, heterogeneite et condensation de la tete femorale ensuite, fracture sous-chondrale avec individualisation du sequestre puis arthrose secondaire. Arlet et Ficat ont cependant individualise une forme particuliere d'OAH qu'ils ont denommee coxopathie...
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