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Abstract
Idiopathic scoliosis is a three-dimensional deformity of the spine. Severe cases generally require surgical instrumentation of the spine to prevent further evolution of the deformities. From one surgeon to another, there is a different way to install the same instrumentation system, which eventually leads to a variable correction of the spine. The objective of the current study is to develop an analytical model for the simulation of the scoliosis surgery with the Cotrel-Dubousset Horizon multiaxial instrumentation system, in order to predict surgery results for a specific configuration of the spine instrumentation. For this purpose, a computer modeling approach using multibody and flexible mechanisms has been retained.
The geometry of the spine model was personalized using patient pre-operative radiographs, while the mechanical properties of the intervertebral parts represent mean values obtained by other experimental studies. The instrumentation system is modeled with multiaxial screws, fixed screws, hooks, nuts and rods. The implants are modeled as rigid bodies, while the rods are entirely flexible with elastic deformation. (Abstract shortened by UMI.)
