Clinical Application of Unilateral-Ring Hybrid Fixation Using DynaExtor(R)

Choi, In Ho; Lee, Ki Seok; Suh, Sung Wook; Chung, Chin Youb; Cho, Tae Joon; Son, Young Jin

Abstract

PURPOSE
We have used a hybrid fixation, in which DynaExtor(R) and Ilizarov rings are connected each other with special connectors. Here, we report upon the technical tips learned and the clinical outcomes of the first twenty five consecutive cases treated using this method.
MATERIALS AND METHODS
Between May 1997 and December 1999, 25 patients were treated using hybrid fixation aimed at simple lengthening (8 patients), concomitant deformity correction and lengthening (12), deformity correction alone (3), and fracture fixation (2).
RESULTS
In the group requiring simple lengthening, the healing index (H.I.) was 38.3 day/cm (23.6-66.8 day/cm). For concomitant deformity correction and lengthening, the mean amount of angular correction was 33.8degrees (15-75degrees) and the length gain, 4.7 cm (2.2-8.9 cm). For deformity correction alone, the amount of angular correction was 50.1degrees (15-120degrees). For fracture fixation, the mean external fixation time was 59.5 days (26-93 days). Complications included mild pin-tract infection in 8 patients, a temporary stiff joint in 5, and equinus of the foot and delayed union in one patient each.
CONCLUSION
The DynaExtor(R) hybrid-fixation system is an effective and convenient method that can be selectively applied to cases that need deformity correction, lengthening, or fixation of the long bone.