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Avascular necrosis of the proximal end of the dens. A complication of
halo-pelvic distraction. Tredwell-SJ; O'Brien-JP J-Bone-Joint-Surg-Am. 1975 Apr; 57(3): 332-6 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.
Original Text by Clifford R. Wheeless, III, MD.
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