Treatment in fractures of the odontoid process.

Fifty-eight cases of odontoid fractures treated at Keio University Hospital and affiliate hospitals from 1965 through 1985 were reviewed. Six patients under age 7 years (group A), were characterized as having epiphysiolysis. Among 52 patients over 8 years of age (group B), there were two Type I, 31 Type II and 19 Type III fractures. All cases in group A were treated conservatively by a plaster cast or a neck brace, and achieved bony union in 6 to 27 weeks. Five of 24 fractures in group B, treated conservatively, failed to unite. Nineteen cases of Type II and six cases of Type III were treated surgically. Transoral fusion was performed in six cases, internal fixation using a compression screw in ten, bone peg fixation in one, posterior fusion in eight, and posterior decompression in one. Two cases treated with transoral fusion and two with screw fixation failed to unite. We recommend conservative treatment of group A patients, Type I, and acute cases of Type III with minimal displacement in group B. Surgery should be performed in acute cases of Type II, Type III with significant displacement, and nonunion cases in Type II and Type III.