• Saba Pasha, Carl-Eric Aubin, Archana P Sangole, Hubert Labelle, Stefan Parent, and Jean-Marc Mac-Thiong.
• *Department of Mechanical Engineering, Polytechnique Montreal, Montréal, Quebec, Canada †Research Center, Sainte-Justine University Hospital Center, Montréal, Quebec, Canada ‡Department of Surgery, Université de Montréal, Montréal, Quebec, Canada; and §Division of Orthopedic Surgery, Hôpital du Sacré-Coeur de Montréal, Montréal, Quebec, Canada.
• Spine. 2014 Apr 1;39(7):564-70.

Study DesignThree-dimensional (3D) analysis of the spinopelvic alignment in adolescent idiopathic scoliosis (AIS).ObjectiveTo study the 3D pelvic alignment with respect to the spinal deformities in AIS subgroups.Summary Of Background DataSpinopelvic alignment is subject to change in scoliosis. Many sacropelvic parameters were developed to characterize spinopelvic alignment in the sagittal plane. However, not much is known about the 3D pelvic alignment with respect to the thoracic and lumbar spinal deformities in AIS.MethodsEighty AIS subjects with right main thoracic (MT), 80 AIS with left thoracolumbar/lumbar (TL/L) curves, and 35 asymptomatic controls were included. Thoracic and lumbar Cobb angles, kyphosis, lordosis, pelvic incidence, pelvic tilt, and sacral slope were measured. Pelvic tilt and axial rotation in the coronal and transverse planes, respectively, were computed using the ipsilateral anterior superior iliac spine and posterior superior iliac spine positions. Leg length discrepancy was determined by the vertical difference in the position of the center of the femoral heads in the coronal plane.ResultsIn 59% of the MT subjects and 79% of the TL/L subjects in the erect position, the pelvis was tilted toward the convex side of the major curve in the coronal plane. The direction of the pelvic axial rotation in the transverse plane was in the same direction as the MT apical vertebra rotation in 84% of the MT subjects and 55% of the TL/L group. The pelvic incidence correlated to the lumbar lordosis in AIS (r = 0.41, P < 0.001). Pelvic coronal tilt correlated significantly to the leg length discrepancy in MT (r = 0.67) and TL/L (r = 0.61) subjects (P < 0.001).ConclusionNovel pelvic parameters were introduced to characterize the spinopelvic relative alignment in scoliotic subgroups. The proposed method related the orientation of the pelvis in the coronal and transverse planes to both thoracic and lumbar spinal deformities.

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