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1965 Publications

ACQUIRED ABSENCE OF THE ODONTOID PROCESS: A CASE REPORT.by FREIBERGER RH, WILSON PD Jr, NICHOLAS JA. - last modified 2013-05-21 09:57
J Bone Joint Surg Am. 1965 Sep;47:1231-6.

 

Since Roberts first described a case of absence of the odontoid process in 1933, there have been fewer than thirty such cases reported. Most of these were found in adults or in children after infancy. Usually the condition was discovered in a patient with neck pain after minor trauma; in some instances, the defect was associated with abnormal neck posture, with neurological findings resulting from compression of the spinal cord or nerve roots, or with obstruction of the vertebral arteries. Since there was no history of sufficient trauma or any unusual event to account for the absence of the major portion of the odontoid process in these cases, it has been assumed that the defect is congenital in nature. Roentgenographically, the odontoid process was missing from the level of the superior articular processes of the axis upward. The ossification center for the tip of the odontoid process, which is separate from that for the rest of the process, was usually present, although tomograms may have been needed for its identification. Invariably, some degree of atlanto-axial dislocation was present.