Spinologics.com. Scoliosis Surgery Simulation
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1 Scoliosis Surgery Simulation
2 Finite Element (FE) Models Finite element model: mathematical method widely used in traditional engineering fields (aeronautics, car industry, civil engineering). Principle: Discretize a given geometry in order to compute the deformations of a body when external forces are applied on it. FE models are increasingly popular in the medical field.
3 Methods: Personalized 3D Geometry
4 Spine FE Model PA View LAT R View AP View
5 Spine FE Model
6 FE Model: Ligaments Anterior Longitudinal Ligament Posterior Longitudinal Ligament
7 FE Model: Ligaments Intertransverse Ligament Interspinous Ligament Supraspinous Ligament Ligamentum Flavum Facet Joint Capsule
8 Spine FE Model: Intervertebral Disc Annulus Fibrosus Nucleus Pulposus Annular Fibers
9 Rod FE Model Screws FE Model Materials: Cobalt Chrome, Titanium, Stainless Steel Plasticity included. Any type of screw can be modeled (here a generic screw was used).
10 Screw Behavior Mono-Axial, Multi-Axial, Uniplanar Screws can be modeled. Xº
11 Hook FE Model
12 Simulation: 1st Rod Attachment
13 Simulation: 1st Rod Attachment
14 Simulation: 2nd Rod Attachment
15 Simulation: Rod Rotation
16 Rod Rotation
17 Simulation: In-Situ Bending 1: Rod attached 2: Bending moment applied on the rod 3: Bending moment released. New equilibrium state (plasticity) 4: Final state after several iterations
18 Simulation: Vertebral Derotation
19 Simulation: Vertebral Derotation
20 Simulation Output: Geometrical Corrections Coronal Plane (Cobb Angles) Standing Pre-op Prone Intra-op Rod 1 Reduction Rod 2 Attached Standing Post-op Generic System System X
21 Output: Geometrical Corrections Sagittal Plane (Kyphosis, Lordosis) Standing Pre-op Prone Intra-op Rod 1 Reduction Rod 2 Attached Standing Post-op Generic System System X
22 Output: Geometrical Corrections Transverse Plane (Axial Rotation) Axial Rotation (º) Generic System System X Ini Intraop Rod1 Reduction Rod2 Rods Locked Post-op
23 Output: Peak Pull-out Forces Force (N) 700 Peak Pull-out Force Generic System System X Ini Rod1 Reduction Rod2 Rods Locked Post-op F = Axial Pull-out Force (N)
24 Output: Rods Stresses Rod 1 Von Mises Stress (MPa) Generic System System X Von Mises Stresses (MPa) Ini Rod1 Reduction Rod2 Rods Locked Post-op
25 Output: Intervertebral Discs Stresses Von Mises Stresses (MPa) 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 Intervertebral Disc Stress (MPa) 5 4,5 4 3,5 3 2,5 2 1,5 1 0,5 0 Ini Rod1 Reduction Rod2 Generic System System X Rods Locked Post-op
26 Spinologics: A Team with over 300 Scientific Publications Driscoll Mark, Mac-Thiong JM., Labelle H., Parent S, Biomechanical Assessment of Reduction Forces Measured During Scoliotic Instrumentation Using Two Different Screw Designs. Spine Deformity, (1): p. p Driscoll Mark, Mac-Thiong JM., Labelle H., Parent S., Development of a detailed volumetric finite element model of the spine to simulate surgical correction of spinal deformities. Biomed Res Int, 2013(2013: ). Clin Julien, Aubin CE, Lalonde N., Labelle H., Parent S., A new method to include the gravitational forces in a finite element model of the scoliotic spine. Med Biol Eng Comput, (8): p Clin Julien, Aubin CE, Sangole A, Labelle H, Parent S, Correlation between immediate inbrace correction and biomechanical effectiveness of brace treatment in adolescent idiopathic scoliosis. Spine. 35(18): , August 15, Mac-Thiong JM, Labelle H, Parent S, Hresko MT, Deviren V, Weidenbaum M; members of the Spinal Deformity Study Group, Reliability and development of a new classification of lumbosacral spondylolisthesis, Scoliosis Dec 10;3:19. doi: /
27 Scoliosis Surgery Simulation To test/optimize your spinal instrumentation design during or after product development. To compare your spinal instrumentation to a generic design. To prove your new spinal instrumentation design is an improvement over previous versions or other existing designs. To assist in obtaining regulatory approval.
28
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