Taylor Spatial Frameの矯正精度―脛骨変形矯正症例での評価

Accuracy of Tibial Deformity Correction with the Taylor Spatial Frame

　目的：Taylor Spatial Frameで変形矯正を行った脛骨65肢の矯正精度を調査した．

　対象と方法：変形の原因は，先天性31肢，発達性13肢，外傷性21肢であった．重症度に従い1D群：延長(14肢)，2D群：延長＋1平面での変形(14肢)，3D群：延長＋2平面での変形(32肢)，4D群：延長＋3平面での変形(5肢)に分けて比較した．正確さの評価は目標誤差5°以下を許容した．アライメントをインデックス化し各群間の比較を行った．

　結果：誤差5°以下の矯正は92％の症例で得られた．矯正後のアライメントは各群間に有意差を認めなかった．

　まとめ：Taylor Spatial Frameにより，変形の重症度に関係なく正確な矯正が行われた．

　Background：The purpose of the study was to investigate the accuracy of correction of tibial deformities with the Taylor Spatial Frame (TSF).

　Methods：We retrospectively reviewed 65 cases of tibial deformities treated by percutaneous osteotomy and gradual correction with the TSF.　There were 31 congenital deformities, 21 traumatic deformities, and 13 developmental deformities.　The final results were compared with the preoperative goal of the correction.　One-dimensional deformity correction included cases with a leg lengthening procedure only, without any other axial deformity correction.　Two-dimensional deformity correction included cases with a leg lengthening procedure and additional axial deformity correction in one plane.　Three-dimensional deformity correction included cases with a leg lengthening procedure and additional axial deformity correction in two planes.　Four-dimensional deformity correction included cases with a leg lengthening procedure and additional axial deformity correction in three planes.　According to the treated count of dimensions, we differentiated four types of deformity corrections.　The results were graded into four groups based on the persisting axial deviation after removing the frame.

　Results：The goal of the deformity correction was achieved in 92% of the cases (in one dimension：100%;in two dimensions：100%;in three dimensions：88%;and in four dimensions：80%).　Use of the TSF enabled accurate deformity correction that was unrelated to the number of planes in which an attempt was made to correct the deformity.

　Conclusion：The TSF allowed precise simultaneous multiplanar deformity corrections.