title: Finite element analysis of the lumbar destabilization following pedicle subtraction osteotomy.
abstract: This study aims to analyze the destabilization produced following a pedicle subtraction osteotomy (PSO), with a calibrated numerical model. A 30° resection was created on L3 and L4. Range of Motion (ROM) and the force acting on the vertebral body were calculated. Osteotomies consistently increased the ROMs. In the intact model, 87% of the compressive load was acting on the vertebral bodies whereas in the destabilized models all the load was on the fractured surface. Osteotomies at both levels induced a marked instability but the PSO at L4 seemed to have a greater influence on the ROM. Despite the significant deformity corrections which could be achieved with PSO, this technique needs further analyses.
authors.affiliation: Laboratory of Biological Structure Mechanics, Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Milan, Italy. Electronic address: claudia.ottardi@polimi.it.
authors.forename: Claudia
authors.initials: C
authors.lastname: Ottardi
authors.affiliation: IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Fabio
authors.initials: F
authors.lastname: Galbusera
authors.affiliation: Department of Spine Surgery III, IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Luca
authors.affiliation: Laboratory of Biological Structure Mechanics, Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Milan, Italy.
authors.forename: Liliana
authors.initials: L
authors.lastname: Prosdocimo
authors.affiliation: Laboratory of Biological Structure Mechanics, Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Milan, Italy.
authors.forename: Maurizio
authors.initials: M
authors.lastname: Sasso
authors.affiliation: Department of Spine Surgery III, IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Marco
authors.initials: M
authors.lastname: Brayda-Bruno
authors.affiliation: Laboratory of Biological Structure Mechanics, Department of Chemistry, Materials and Chemical Engineering "G. Natta", Politecnico di Milano, Milan, Italy; IRCCS Istituto Ortopedico Galeazzi, Milan, Italy.
authors.forename: Tomaso
authors.initials: T
authors.lastname: Villa
mesh_terms: D000328:Adult; D020342:Finite Element Analysis; D006801:Humans; D008159:Lumbar Vertebrae / Q000502:physiology / Q000601:surgery*; D008297:Male; D017711:Nonlinear Dynamics; D010027:Osteotomy; D065289:Pedicle Screws; D011475:Prosthesis Failure; D016059:Range of Motion, Articular; D012306:Risk
keywords: Destabilization; Finite elements; Lumbar spine; Osteotomy; Pedicle subtraction osteotomy