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A New Technique for Deformity Correction

The Ilizarov method corrects bone deformities by gradually distracting and aligning an osteotomy using a mechanical fixator. In previous work, we proposed a technique for computer–assisted deformity correction of the Ilizarov method using the Taylor Spatial Frame. In this paper, we summarize the technique and the preliminary results of our first clinical case. The salient feature of our method is that we improve accuracy by (1) removing the need to measure the 13 frame parameters preoperatively by hand, (2) basing the correction on the actual location of the frame with respect to the anatomy; any translational or angular problems that occur while mounting the frame are compensated for immediately, and (3) calculating the correction based on 3D coordinates from CT data rather than measuring from radiographs. Furthermore, the surgeon is given greater flexibility in frame placement; indeed, we essentially bypass the “chronic deformity correction” step to the “total residual correction” phase. Finally, this technique may make it feasible to use the Taylor Spatial Frame for trauma cases which is impossible with conventional techniques.