Three-dimensional per-operative opto-electronic analysis of Cotrel-Dubousset surgery

To study the three-dimensional (3D) corrective mechanisms of the Cotrel-Dub ousset Instrumentation (CDI), we used the VICON system with 5 cameras and d eveloped specific tools. Thus. following a previous study [4], assessments of vertebral motion for 7 scoliotic patients who underwent CDI were perform ed within a controlled accuracy (1.5 degrees for rotations & 1 mm for trans lations). Results show that the CDI provides 3D vertebral motions and the m easurement method allows the surgeons to objectively analyze the intermedia te steps of the surgery, and permits the constitution of a data base far fi nite elements model validation.