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The Cotrel-Dubousset (CD) scoliosis surgery was simulated for 10 patients with idiopathic scoliosis using a 3D finite element model (FEM) of the patient's entire spine. The geometry of the FEM was extracted from a 3D stereo-radiographic reconstruction, and mechanical properties were personalized using lateral bending films. Finally, each step of the CD correction was simulated and results were compared with the post-operative 3D stereo-radiographic reconstruction. The whole procedure was applied for 10 patients, and quantitative comparison was performed between post-operative spine configuration and predicted configuration. For all patients, mean differences between post-operative measurements and predicted values of vertebral rotation were estimated at 5° (max: 13°) and those for linear position at 6 mm (max: 12 mm). Furthermore, intermediate steps of surgery simulation were consistent with the literature. Then, for one scoliotic patient, the model was used to investigate three alternative surgical strategies. It was found that a one-level change in the instrumentation limit may have a significant effect on spine alignment and correction. [ABSTRACT FROM AUTHOR]

Introduction. The advantages of a patient-specific 3D-model of the Spine for congenital scoliosis have been lately attested by some clinical researches (Peng et al. 2006. Chin J Radiol. 40(3):297-300). Method. This preliminary study was conducted on a patient affected by congenital scoliosis. She benefited from an EOS biplanar X-ray exam. Results. The full spine could be reconstructed including the hemivertebra. The precision of the reconstruction was qualitatively compared to a CT reconstruction and various parameters could be quantified. Conclusions. Providing a clinical validation, the presented method could extend the actual possibilities of today's algorithm to reconstruct congenital 3D-deformations. [ABSTRACT FROM AUTHOR]

An abstract of the article "In vivo cervical intervertebral disc characterisation by elastography," by C. Vergari and colleagues is presented.

The article evaluates the novel semi-automated 3D reconstruction method of spine from biplanar radiography. The study shows that the Fast Spine reconstruction level is a relevant tool for scoliosis diagnosis. Meanwhile, the Dull Spine reconstruction level , with an average accuracy of 1.0mm is interesting for research purposes.

The article reports on results of a study of the mechanisms of idiopathic scoliosis progression using finite element simulation. A description of the experimental set-up and measurement method is presented. The study concluded that an anterior spinal overgrowth combined with gravity and a pre-existent curve in the spine could lead to a progression of scoliosis.

The article reports on results of a comparative study of scoliotic spines using a fast 3D reconstruction model from biplanar X-rays. A description of the experimental set-up and measurement method is presented. The study concluded that the comparison between different subjects' categories gives reference values which will guide clinicians in their clinical diagnosis.

Presents the results of a study on the use of a validated finite element simulation to plan for scoliosis surgery. Procedure for scoliosis surgery; Use of stereoradiography and X-ray clinical bending tests to personalize the 3D finite element model; Components of the simulation process.