There should be no more than 12 mm between: This is a potentially life-threatening injury which can be difficult to detect. Rarely, however, there may be subluxation at the atlanto-occipital joint without such devastating effects. Special Consideration: Atlanto-occipital SubluxationĪtlanto-occipital dislocation is usually a fatal injury. Assess for uniformity at each levelĬlick on the x-ray to enlarge. The distance between the anterior margin of the odontoid process and the posterior portion of the arch of C1 should be no greater than 3 mm in the adult spine The distance between the vertebral bodies from C2/3 onwards.Special note should be made of the following: CartilageĪlthough cartilage itself is not visible on plain imaging, the cartilaginous spaces should be assessed for uniformity. The Harris ring may be incomplete at the 5-7 o’clock position but should be complete elsewhere. However, if there is disruption elsewhere, this should raise suspicion for a fracture. This may be incomplete between the 5 and 7 o’clock position in the normal x-ray. The body of C2 should have a visible ring on the lateral view – the Harris ring. This is also the posterior limit of the spinal canal
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