Correction of Shortening and/or Angular Deformities by Distraction Osteogenesis Using AO-Thbular Fixator

CHANCHIT SANGKAEW, MD*

Affiliation : * Department of Orthopedic Surgery, Police General Hospital, Bangkok 10330, Thailand.

AbstractEighteen patients (20 bony segments) who had shortening and/or angular deformities were treated by distraction osteogenesis using AO-tubular external fixator. The mean angular correction was 18.9 degrees (range, 8-40 degrees). Of the group in whom shortening and angulation was corrected, the mean length gained was 4.2 em (3-6 em). The mean treatment time was 4.9 months (range, 2-13 months) and the mean follow-up was 12 months after removal of the fixator (range, 3-30 months). Delayed union with loosening of the fixator occurred in one patient which resulted in residual shorten ing of 1.5 em. The author's technique of distraction osteogenesis using AO-tubular fixator with the new distraction rate of I mm/48 h (I mm/step) could adequately correct shortening and/or angular deformities. No extra equipment was needed other than the readily-available AO-tubular fixation sys tems. No serious complications such as neurovascular injury were encountered.

Keywords : Bone Lengthening, Distraction Osteogenesis, AO-External Fixator

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