title: Finite element simulation of spinal deformities correction by in situ contouring technique.
abstract: Biomechanical models have been proposed in order to simulate the surgical correction of spinal deformities. With these models, different surgical correction techniques have been examined: distraction and rod rotation. The purpose of this study was to simulate another surgical correction technique: the in situ contouring technique. In this way, a comprehensive three-dimensional Finite Element (FE) model with patient-specific geometry and patient-specific mechanical properties was used. The simulation of the surgery took into account elasto-plastic behavior of the rod and multiple moments loading and unloading representing the surgical maneuvers. The simulations of two clinical cases of hyperkyphosis and scoliosis were coherent with the surgeon's experience. Moreover, the results of simulation were compared to post-operative 3D measurements. The mean differences were under 5 degrees for vertebral rotations and 5 mm for spinal lines. These simulations open the way for future predictive tools for surgical planning.
authors.affiliation: UMR 8005 CNRS-ENSAM, Laboratoire de Biomécanique, 151 Boulevard de l'Hôpital, 75013, Paris, France.
authors.forename: R
authors.initials: R
authors.lastname: Dumas
authors.forename: V
authors.initials: V
authors.lastname: Lafage
authors.forename: Y
authors.initials: Y
authors.lastname: Lafon
authors.forename: J-P
authors.initials: JP
authors.lastname: Steib
authors.forename: D
authors.initials: D
authors.lastname: Mitton
authors.forename: W
authors.initials: W
authors.lastname: Skalli
mesh_terms: D000328:Adult; D003198:Computer Simulation; D020342:Finite Element Analysis; D006801:Humans; D007738:Kyphosis / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery*; D008954:Models, Biological; D009038:Motion; D020127:Recovery of Function / Q000502:physiology; D012600:Scoliosis / Q000175:diagnosis / Q000503:physiopathology* / Q000601:surgery*; D013123:Spinal Fusion / Q000379:methods*; D025321:Surgery, Computer-Assisted / Q000379:methods; D014143:Traction / Q000379:methods*; D016896:Treatment Outcome