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Although halo-vest immobilization remains a common form of treatment for type II odontoid fractures, nonunion and C1–2 instability may be the result in up to 20% to 40% of patients.Supine and upright lateral X-ray films may allow early identification of patients likely to fail halo-vest treatment and earlier surgical treatment with decreased morbidity from prolonged unsuccessful halo-vest immobilization...
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