title: Avascular necrosis of the proximal end of the dens. A complication of halo-pelvic distraction.
abstract: Roentgenographic evidence of avascular necrosis of the upper part of the dens was observed in thirteen of ninety-four patients treated for tuberculous kyphosis or non-tuberculous scoliosis using halo-pelvic distraction. Four patients had some residual loss of motion. A significant relationship was demonstrated between avascular necrosis and the amount of distraction visible on roentgenograms.
mesh_terms: D000293:Adolescent; D000328:Adult; D001368:Axis, Cervical Vertebra / Q000000981:diagnostic imaging; D002574:Cervical Vertebrae / Q000000981:diagnostic imaging; D002648:Child; D005260:Female; D006801:Humans; D007738:Kyphosis / Q000209:etiology / Q000628:therapy; D008297:Male; D009336:Necrosis / Q000000981:diagnostic imaging / Q000209:etiology*; D011859:Radiography; D012189:Retrospective Studies; D012600:Scoliosis / Q000628:therapy; D014143:Traction / Q000009:adverse effects*; D014399:Tuberculosis, Spinal / Q000150:complications