Reliability of 3D Reconstruction of the Spine of Mild Scoliotic Patients

Gille, Olivier; Champain, Nicolas; Benchikh-El-Fegoun, Abdelkrim; Vital, Jean-Marc; Skalli, Wafa

doi:10.1097/01.brs.0000256866.25747.b3

Cited by 66 publications

(46 citation statements)

References 37 publications

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“…The spine 3D geometry is limited between T1 and S1 since cervical spine is not routinely captured. Validation of the accuracy and reproducibility of the 3D reconstruction method has been reported in previous studies [13][14][15] particularly the reliability of 3D reconstruction of the spine of mild scoliotic patients [16]: the 95 % prediction limits for the intra-and interobserver errors in measurement were computed. 95 % prediction limits indicate the difference between two successive replicate measurements that would exceed approximately 5 % of the time due to an error of measurement.…”

Section: Patientsmentioning

confidence: 89%

“…For each of these patients, the effective outcome of the scoliosis, stable or progression was compared to the group initially assigned to the patient. The inter-and intra-observer reproducibility measurement (95 % precision) of Cobb angle with the EOS system is 2°f or mild scoliosis [16]. Therefore, the criterion for progression was an increase in the curve of 5°or more that was confirmed radiographically on two consecutive occasions or the initiation of brace treatment.…”

Section: Follow-upmentioning

confidence: 99%

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Transverse plane 3D analysis of mild scoliosis

et al. 2013

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Purpose To demonstrate the reality of a transverse plane pattern independent of the scoliotic curve location and to show the importance of the transverse plane pattern in the assessment of the progression risk in a population of mild scoliosis. Methods Spines of 111 patients with adolescent idiopathic mild scoliosis were reconstructed using biplanar stereoradiography. The apical axial rotation, the intervertebral axial rotation at junctions and the torsion index were computed. Mean values of each parameter were compared between thoracic, thoracolumbar and lumbar curves. Then a cluster analysis was performed using these parameters on 78 patients with effective outcomes at skeletal maturity. The effective outcomes and the results reached with the statistical analysis were compared and analyzed (ROC and logistic regression). Results No statistical difference was observed when considering each parameter between the different types of curves. Two clusters independent of the curve type were identified. The mean values of transverse plane parameters were significantly higher in Cluster 1 than in Cluster 2. 91 % of patients classified in Cluster 1 had progressive curve and 73 % of patients classified in Cluster 2 remained stable at skeletal maturity. All parameters were good predictors but the best was the torsion index.Conclusions This study demonstrated that a transverse plane pattern combining apical axial rotation, the intervertebral axial rotation at junctions and the torsion index is independent of the scoliotic curve location and significant in the determination of the progression risk of mild scoliosis.

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Section: Patientsmentioning

confidence: 89%

Section: Follow-upmentioning

confidence: 99%

Transverse plane 3D analysis of mild scoliosis

et al. 2013

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“…There is evidence that vertebral rotation measurement based on 3D reconstruction of conventional bidirectional X-ray images gives more accurate results as compared with all other methods [34]. On the other hand, segmental intervertebral rotation could also be evaluated based on 3D reconstructions [35].…”

Section: Discussionmentioning

confidence: 99%

Comparison of scoliosis measurements based on three-dimensional vertebra vectors and conventional two-dimensional measurements: advantages in evaluation of prognosis and surgical results

Illés

Somoskeőy

2013

Eur Spine J

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Purpose A new concept of vertebra vectors based on spinal three-dimensional (3D) reconstructions of images from the EOS system, a new low-dose X-ray imaging device, was recently proposed to facilitate interpretation of EOS 3D data, especially with regard to horizontal plane images. This retrospective study was aimed at the evaluation of the spinal layout visualized by EOS 3D and vertebra vectors before and after surgical correction, the comparison of scoliotic spine measurement values based on 3D vertebra vectors with measurements using conventional twodimensional (2D) methods, and an evaluation of horizontal plane vector parameters for their relationship with the magnitude of scoliotic deformity. Methods 95 patients with adolescent idiopathic scoliosis operated according to the Cotrel-Dubousset principle were subjected to EOS X-ray examinations pre-and postoperatively, followed by 3D reconstructions and generation of vertebra vectors in a calibrated coordinate system to calculate vector coordinates and parameters, as published earlier. Conclusions Vertebra vectors provide a key opportunity to visualize spinal deformities in all three planes simultaneously. Measurement methods based on vertebral vectors proved to be just as accurate and reliable as conventional measurement methods for coronal and sagittal plane parameters. In addition, the horizontal plane display of the curves can be studied using the same vertebra vectors. Based on the vertebra vectors data, during the surgical treatment of spinal deformities, the diminution of the lateral translation of the vertebras seems to be more important in the results of the surgical correction than the correction of the axial rotation.

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“…23 girls and 7 boys were included. The mean age at radiological examination was 11 [range [8][9][10][11][12][13][14]. 10 were classified Risser 0 or 1, 7 were Risser 2, 8 were Risser 3 and 5 were Risser 4.…”

Section: Imaging Protocol and 3d Modelingmentioning

confidence: 99%

“…These methods of 3D reconstruction of the spine have been validated in asymptomatic and scoliotic patients [10][11][12][13]. The purpose of the current study was to analyze the variability of the effect of brace treatment on the 3D shape of idiopathic scoliosis.…”

Section: Introductionmentioning

confidence: 99%

3D analysis of brace treatment in idiopathic scoliosis

et al. 2013

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Purpose We have evaluated the effect of bracing in scoliosis on coronal alignment in a cohort of patients. Current literature has not described the specific effect of bracing on the 3D shape of the scoliotic curves. The purpose of this study was to analyze the variability of the 3D effect of bracing on idiopathic scoliosis. Materials and methods The spines of 30 patients with adolescent idiopathic scoliosis were reconstructed using biplanar stereoradiography with and without the brace. The Cobb angle, sagittal and pelvic parameters and transverse plane parameters were calculated. The variability and the mean values of each parameter, with and without a brace, were analyzed and compared using a student t test. Results The Cobb angle improved in 50 % of patients but remained unchanged in 50 % cases. In 90 % of the cases lordosis was decreased. The thoracic kyphosis was decreased in 26 % cases, unchanged in 57 % of cases and increased in 17 % cases. The AVR was improved ([5°) in 26 % cases, worsened in 23 % and unchanged in 50 %. Only the differences of Cobb angle and the lordosis were statistically significant.Conclusions Global statistics of this study concur with the literature. The Cobb angle was significantly improved. It also showed a significant hypolordotic effect. However, the results showed a high variability of the brace treatment effect in almost every parameter. Analysis of this variability by means of 3D reconstructions instead of global statistics should help characterize the mechanisms of correction of brace treatment.

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Reliability of 3D Reconstruction of the Spine of Mild Scoliotic Patients

Abstract: The reliability of 3D reconstruction of the spine is acceptable, and this technique can be used for clinical studies.

Cited by 66 publications

References 37 publications

Transverse plane 3D analysis of mild scoliosis

Transverse plane 3D analysis of mild scoliosis

Comparison of scoliosis measurements based on three-dimensional vertebra vectors and conventional two-dimensional measurements: advantages in evaluation of prognosis and surgical results

3D analysis of brace treatment in idiopathic scoliosis

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