11 research outputs found
The potential risk of spinal cord injury from pedicle screw at the apex of adolescent idiopathic thoracic scoliosis: magnetic resonance imaging evaluation
Sagittal profile control in patients affected by neurological scoliosis using Universal Clamps: a 4-year follow-up study
The effect of different screw-rod design on the anti-rotational torque: a biomechanical comparison of three conventional screw-rod constructs
Modelling of moisture migration during convective drying of pineapple slice considering non-isotropic shrinkage and variable transport properties
Sagittal balance correction of idiopathic scoliosis using the in situ contouring technique
Vertebral derotation in adolescent idiopathic scoliosis causes hypokyphosis of the thoracic spine
<p>Abstract</p> <p>Background</p> <p>The purpose of this study was to test the hypothesis that direct vertebral derotation by pedicle screws (PS) causes hypokyphosis of the thoracic spine in adolescent idiopathic scoliosis (AIS) patients, using computer simulation.</p> <p>Methods</p> <p>Twenty AIS patients with Lenke type 1 or 2 who underwent posterior correction surgeries using PS were included in this study. Simulated corrections of each patient’s scoliosis, as determined by the preoperative CT scan data, were performed on segmented 3D models of the whole spine. Two types of simulated extreme correction were performed: 1) complete coronal correction only (C method) and 2) complete coronal correction with complete derotation of vertebral bodies (C + D method). The kyphosis angle (T5-T12) and vertebral rotation angle at the apex were measured before and after the simulated corrections.</p> <p>Results</p> <p>The mean kyphosis angle after the C + D method was significantly smaller than that after the C method (2.7 ± 10.0° vs. 15.0 ± 7.1°, p < 0.01). The mean preoperative apical rotation angle of 15.2 ± 5.5° was completely corrected after the C + D method (0°) and was unchanged after the C method (17.6 ± 4.2°).</p> <p>Conclusions</p> <p>In the 3D simulation study, kyphosis was reduced after complete correction of the coronal and rotational deformity, but it was maintained after the coronal-only correction. These results proved the hypothesis that the vertebral derotation obtained by PS causes hypokyphosis of the thoracic spine.</p