Three-Dimensional Quantitative Segmental Analysis of Scoliosis Corrected by the In Situ Contouring Technique

Dumas, Raphaël; Steib, Jean-Paul; Mitton, David; Lavaste, F.; Skalli, Wafa

doi:10.1097/01.brs.0000068242.29809.d0

Cited by 18 publications

(15 citation statements)

References 28 publications

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“…On the other hand, segmental intervertebral rotation could also be evaluated based on 3D reconstructions [35]. Nevertheless, for obtaining a highly accurate 3D reconstruction, the precisely perpendicular placement of frontal and lateral X-ray detectors and proper patient positioning during imaging are essential.…”

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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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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“…Moreover, this 3D reconstruction allows the segmental quantitative Table 1 for measurement values analysis of rotational deformities [22,23]. For the highest possible accuracy and reliability of 3D reconstruction-based measurements, the precisely orthogonal acquisition of biplanar X-rays and correct patient positioning are of critical importance [23].…”

Section: Discussionmentioning

confidence: 99%

Breakthrough in three-dimensional scoliosis diagnosis: significance of horizontal plane view and vertebra vectors

2010

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Scoliosis is a multifactorial three-dimensional (3D) spinal deformity with integral and directly related vertebral deviations in the coronal, sagittal and horizontal planes. Current classification and diagnostic methods rely on two-dimensional (2D) frontal and lateral X-ray images; no routine methods are available for the visualization and quantitative evaluation of deviations in the horizontal plane. The EOS 2D/3D system presented here is a new, low-dose, orthopedic radiodiagnostic device based on Nobel prize-winning X-ray detection technology with special software for 3D surface reconstruction capabilities that finally led to a breakthrough in scoliosis diagnosis with high-quality, realistic 3D visualization and accurate quantitative parametric analysis. A new concept introducing vertebra vectors and vertebra vector parametric calculations is introduced that furnishes simplified visual and intelligible mathematical information facilitating interpretation of EOS 2D/3D data, especially with regard to the horizontal plane top view images. The concept is demonstrated by a reported scoliotic case that was readily characterized through information derived from vertebra vectors alone, supplemented with the current angulation measurement methods in the coronal and sagittal planes and axial vertebral rotation measurements in the horizontal plane, with a calibrated 3D coordinate system suitable for inter-individual comparisons. The new concept of vertebra vectors may serve as a basis for a truly 3D classification of scoliosis.

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“…They reconstructed 3D models using bi-planar radiographs, and examined the difference among four operative methods. Steib et al also performed 3D studies about the 3D change before and after surgical correction by in situ contouring technique using the reconstructed 3D models from bi-planar radiographs [6,7,16,27]. However, these methods lacked accuracy since their method required only about 6-20 landmarks when reconstructing the bone models.…”

Section: Intervertebral Axial Rotationmentioning

confidence: 99%

“…Although there have been some studies regarding intervertebral deviation of AIS [5,7,24], no detailed 3D study using an in vivo model of AIS has been reported. Therefore, the present study aimed to develop a local coordinate system for the AIS vertebra and to evaluate the in vivo 3D intervertebral deviation in the coronal, axial and sagittal planes in order to provide guidance for its surgical correction.…”

Section: Introductionmentioning

confidence: 99%

In vivo three-dimensional segmental analysis of adolescent idiopathic scoliosis

et al. 2011

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Introduction An accurate assessment of three-dimensional (3D) intervertebral deviation is crucial to the better surgical correction of adolescent idiopathic scoliosis (AIS).However, a precise 3D study of intervertebral deviation has not been previously reported. Objective The purpose of the present study is to evaluate the intervertebral coronal inclination, axial rotation and sagittal angulation of AIS using 3D bone models and a local coordinate system. Materials and methods 3D bone models of the thoracic and lumbar spine of ten AIS patients were constructed using computed tomography. The local coordinate axis was determined semi-automatically for each vertebra. By using these local coordinates, the intervertebral deviation angles were calculated in the coronal, axial and sagittal planes and projected to subjacent local coordinates. Result The intervertebral deformity in the coronal plane was larger near the apical region and smaller near the junctional region. Conversely, the intervertebral rotation in the axial plane was smaller near the apical region, and larger near the junctional region. Concerning the sagittal plane deformity, the constant tendency was not recognized. Conclusion Using a local coordinate system for the vertebra of AIS, we measured the 3D intervertebral coronal, axial and sagittal deviation of the thoracolumbar spine and found that the change in the intervertebral inclination angle in the coronal plane increased toward the apical region and decreased toward the junctional region, and that the converse tendency was noted for the axial intervertebral rotational angle. This analysis provides an improved 3D guide for the surgical correction of AIS.

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Three-Dimensional Quantitative Segmental Analysis of Scoliosis Corrected by the In Situ Contouring Technique

Abstract: Three-dimensional reconstruction of the spine allows quantitative segmental analysis of the deformity. This could be used as a reliable tool to evaluate both the severity of the scoliosis and the effects of the surgical correction.

Cited by 18 publications

References 28 publications

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

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

Breakthrough in three-dimensional scoliosis diagnosis: significance of horizontal plane view and vertebra vectors

In vivo three-dimensional segmental analysis of adolescent idiopathic scoliosis

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