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The simulated osteotomies- preoperative bone models with simulated correction - and the performed osteotomies - postoperative bone models – were analyzed for residual differences in 3D alignment.
The mean vertebral rotation angle at the apex was 15.2 ± 5.5 before the simulated correction, and it was 0 (completely corrected) after the C + D simulation.
Thus the purpose of the study was to develop and initiate validation of a detailed osteoligamentous finite element model of the spine with simulated correction from spinal instrumentation.
The simulated correction was started at L5 and continued to T1.
The mean radius of curvature of the thoracic spine before the simulated correction was 1660 ± 1461 mm.
The simulated correction was performed by rotating each vertebra around the intervertebral axis until the neighboring vertebral reference planes became matched on the same plane.
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The clinical relevance of these simulated corrections was evaluated by comparing the values obtained from the simulations with those measured on the postoperative CT taken for each patient.
The mean thoracic kyphosis angle and radius of curvature were also between the mean values of the two simulated corrections.
The kyphosis angle (T5-T12) and vertebral rotation angle at the apex were measured before and after the simulated corrections.
These results suggest that the real surgery can achieve a limited correction in the axial plane that falls between the two extremes of the simulated corrections.
The simulated corrections of scoliosis for each patient were performed on segmented 3D models of the whole scoliotic spine, created using 3D image processing software (Mimics; Materialise NV, Belgium) and based on a 1-mm-thick preoperative CT scan slice.
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