Fracture of the odontoid process. An experimental and clinical study.
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To prevent the occurrence of postoperative cervical malalignment, which is often a complication of conventional axial laminectomy or laminoplasty, the authors developed a new double-door laminoplasty procedure in which the C-2 spinal canal is expanded while all the muscular attachments to each split half of the spinous process remain undisturbed. In conjunction with laminoplasties at other levels, this procedure was performed in five patients with ossification of the posterior longitudinal ligament and cervical myelopathy. Neurological improvement was demonstrated in each patient, and there was no radiological evidence of cervical malalignment. The technique for this procedure is described and its usefulness in preventing postoperative spinal malalignment is discussed.
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The authors review their experience in managing 26 cases of "hangman's fracture." The basic mechanism of injury was hyperextension of the upper cervical spine. Radiographic studies revealed a spectrum of injury beginning with the classical hangman's fracture and progressing to the simple C-2 laminar-pedicle fracture. Appreciation of the fracture instability will dictate the method and duration of fracture treatment. Management by a closed, nonoperative means resulted in solid union of the bone in all fully treated cases, with a minimum of morbidity.