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Atlanto-Axial Deformity Secondary to a Neglected Odontoid Fracture: A Report of Six Cases

We reviewed 6 patients with atlanto-axial (C1–2) deformities secondary to neglected odontoid fractures. All patients (except one with recent injury) were asymptomatic for a long period before development of neck pain or myelopathy, despite obvious subluxation and kyphotic deformities at the C1–2 joint complex. Patients were treated conservatively, except for one who underwent posterior spinal fusion and occiput-to-C2 decompression for progressive myelopathy. The reactive new bone formation around the odontoid fracture may play a role in preventing further movement and development of myelopathy. Conservative treatment should be considered for neglected odontoid fractures in elderly patients with stable non-progressive C1–2 deformity.