Avascular necrosis

The Xray here shows – Avascular necrosis of the femoral head with segmental collapse. Osteonecrosis (avascular necrosis/aseptic necrosis) occurs within the bone following loss of osseous blood supply. All cells within the area of affected bone die away; initially the organic and inorganic matrix are unaffected. It commonly affects patients in the third, fourth, or fifth decades […]


The radiographs show localized diffuse cortical thickening that is characteristic of melorheostosis.  The condition may be monostotic or it may involve many bones in one extremity (monomelic) in the distribution of a sclerotome.  Bone scans will show increased uptake at the site or sites of skeletal involvement.  Long tubular bones are most commonly involved.  Melorheostosis […]