Traumatic Atlanto-axial Dislocations -A report of two cases-

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Two cases of chronic atlanto-axial dislocations due to trauma have been presented. One of them, sixty-four-year-old man, had late neulorogic manifestations, the other, fouty-four-year-old man, compaline of a tumor in the nuchal region when he flexed his neck.Rentogenograms showed a anterior dislocation of the atlas on the axis with old fracture of the odontoid process, especially when the cervical spine was flexed.Reduction of the dislocation by skeletal traction followed by occipital fusion with iliac graft or graft from the tibia.Several monthes after the surgery, a bone scan was obtained with 99mTc. The area where the bone was inplanted shows increased accumlation of radiopharmaceutical.