![]() If this is a fixed defect, C2 is rotated in conjunction with C1. The head may be pointed anteriorly, C1 is turned. On CT, C1 is not oriented in line with the head. Although fractures of the odontoid occur in all age groups, younger patients often sustain these injuries after motor vehicle accidents while older patients present after low-energy falls and are less likely to have severe neurological deficits 10, 32, 60, 63, 68. In a vertical subluxation, the dens is often above the McGregor line by over 8 mm in men and 9.7 mm in women. The expected distance between the anterior arch of C1 and the dens in the fully flexed position should be <3 mm in an adult (~5 mm in a child) 5. In a non-traumatic setting, flexion and extension views may be performed. Surgical fixation is recommended for type II and III odontoid fractures (OFx) with major translation of the odontoid fragment, regardless of the patient’s age, and for all type II OFx in patients aged 50 years. according to ICD-10,33 Head Injury Severity Scale (HISS),34 preoperative. type IV: rotation and posterior displacement of the atlas classification, especially for type II fractures, with the aim of helping to. ![]() was reviewed using ICD-9/ICD-10 codes to identify patients with C-2 fractures.
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