From in vitro evaluation of a finite element model of the spine to in silico comparison of spine instrumentations
Article dans une revue avec comité de lecture
Growth-preserving spinal surgery suffer from high complications rate. A recent bipolar instrumentation using two anchoring points (thoracic and pelvic) showed lower rates, but its biomechanical behaviour has not been characterised yet. The aim of this work was to combine in vitro and in vivo data to improve and validate a finite element model (FEM) of the spine, and to apply it to compare bipolar and classical all-screws implants. Spinal segments were tested in vitro to measure range of motion (ROM). Thoracic segments were also tested with bipolar instrumentation to measure ROM and rod strain using a strain gage. A subject-specific FEM of the spine, pelvis and ribcage of an in vivo asymptomatic subject was built. Spinal segments were extracted from it to reproduce the in-vitro mechanical tests. Experimental and simulated ROM and rod strain were compared. Then, the full trunk FEM was used to compare bipolar and all-screws instrumentations. The FEM fell within 1° of the experimental corridors, and both in silico and in vitro instrumentation rods showed 0.01% maximal axial strain. Bipolar and all-screws constructs had similar maximal Von Mises stresses. This work represents a first step towards subject-specific simulation to evaluate spinal constructs for neuromuscular scoliosis in children.
Files in this item
Showing items related by title, author, creator and subject.
Article dans une revue avec comité de lectureGAUME, Mathilde; PERSOHN, Sylvain; VERGARI, Claudio; GLORION, Christophe; SKALLI, Wafa; MILADI, Lotfi (Springer Verlag, 2020)Study design Biomechanical human cadaver study. Objective To determine the three-dimensional intervertebral ranges of motion (ROMs) of intact and hook-instrumented tho- racic spine specimens subjected to physiological ...
Evaluation of a patient-specific finite element model to simulate conservative treatment in adolescent idiopathic scoliosis Article dans une revue avec comité de lectureVERGARI, Claudio; RIBES, Gwenael; AUBERT, Benjamin; ADAM, Clayton; MILADI, Lotfi; ILHARREBORDE, Brice; ABELIN-GENEVOIS, Kariman; ROUCH, Philippe; SKALLI, Wafa (Springer Verlag, 2014)Study design: Retrospective validation study Objectives: To propose a method to evaluate, from a clinical standpoint, the ability of a finite element model (FEM) of the trunk to simulate orthotic correction of spinal ...
Evaluation of a Patient-Specific Finite-Element Model to Simulate Conservative Treatment in Adolescent Idiopathic Scoliosis Article dans une revue avec comité de lectureVERGARI, Claudio; RIBES, Gwenael; AUBERT, Benjamin; ADAM, Clayton; MILADI, Lotfi; ABELIN-GENEVOIS, Kariman; ROUCH, Philippe; SKALLI, Wafa (Springer Verlag, 2015)Study design: Retrospective validation study. Objectives: To propose a method to evaluate, from a clinical standpoint, the ability of a finite-element model (FEM) of the trunk to simulate orthotic correction of spinal ...
Relevance of using a compressive preload in the cervical spine : an experimental and numerical simulating investigation Article dans une revue avec comité de lectureBARREY, Cédric; ROUSSEAU, Marc-Antoine; PERSOHN, Sylvain; CAMPANA, Sophie; PERRIN, Gilles; SKALLI, Wafa (Springer-Verlag, 2015)Simulating compressive action of muscles, a follower load attends to reproduce a more physiological biomechanical behaviour of the cervical spine. Only few experimental studies reported its influence on kinematics and ...
Article dans une revue avec comité de lectureLOISEL, François; DURAND, Stan; PERSOHN, Sylvain; AUBRY, Sébastien; LEPAGE, Daniel; BONNET, Xavier; SKALLI, Wafa (Elsevier, 2020)The scapholunate joint is one of the keystones of the wrist kinematics, and its study is difficult due to the carpal bones size and the richness of surrounding ligaments. We propose a new method of quantitative assessment ...