Cervical Spine Fracture with Extreme Dislocation in a Patient with Ankylosing Spondylitis: A Case Report and Systematic Review of the Literature

Background: Ankylosing spondylitis (AS) is a seronegative arthropathy which results in pathological ossification of the ligaments, disc, endplates and apophyseal structures. Cervical spinal fractures are more common in patients with ankylosing spondylitis than in patients without ankylosing spondylitis due to coexistent osteoporosis and kyphotic alignment of the spine. The risk of fracture–dislocation and associated spinal cord injury is also more in these patients. Management of cervical spine fractures in patients with ankylosing spondylitis is more challenging. Case Description: We report a 56-year-old male patient who presented to our emergency department following a road traffic accident. He had ASIA B spinal cord injury at C7 level. CT scan revealed a C6–7 fracture–dislocation with features suggestive of AS. The fracture involved all the three columns and extended through C7 body anteriorly and through the C6–7 disc posteriorly. The treating team was not aware that he had AS, and thus, precautions related to his head position were not taken. He underwent reduction of the fracture–dislocation and 360° fixation. Conclusions: The management of cervical spine fractures in patients with ankylosing spondylitis is challenging. They need long segment fixation in their preoperative spinal alignment. Proper preoperative planning can result in good outcome.

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