Comparative Analysis of Physical Examination, CT Scan, and Three-Dimensional Gait Analysis in Evaluating Lower Extremity Torsion Deformities in Children with Cerebral Palsy.

BACKGROUND The aim of this study was to analyze the correlation and the accuracy of lower-extremity torsion deformities measured by physical examination, CT scan, and three-dimensional gait analysis in children with CP. MATERIAL AND METHODS The study group included 72 children with CP with lower-extremity torsion deformities. All subjects were assessed by: 1. physical examination: maximum internal rotation (MIR), maximum external rotation (MER) for hip joint torsion, and transmalleolar axis (TMA) for tibial torsion; 2. CT scanning: femoral anteversion (FAV) and tibial torsion (TT); 3. three-dimensional gait analysis kinematic parameters: single-support phase of femoral rotation, double-support phase of femoral rotation, swing phase of femoral rotation and single-support phase of tibial rotation, double-support phase of tibial rotation, and swing phase of tibial rotation. Statistical analysis was performed using the Pearson correlation test. A significance level of P<0.05 was set. RESULTS In femurs, MIR and MER were correlated with FAV, and the correlation of MER was higher, while physical examination and FAV were not correlated with any kinematic data in gait analysis. In tibias, there was no correlation between TMA and TT, but both TMA and TT were correlated with the gait analysis kinematic data, and the correlation of TT was higher. TMA was more correlated with tibial rotation during swing phase, while TT was more correlated with tibial rotation in single-support phase. CONCLUSIONS Three-dimensional gait analysis can analyze the tibial rotation of children with cerebral palsy, which is highly correlated with CT and physical examination. However, femoral rotation was not associated with CT and physical examination.