Evaluation of the Three-Dimensional Deformities in Scoliosis Surgery With Computed Tomography

Hong, Jae Young; Suh, Seung Woo; Easwar, T. R.; Modi, Hitesh N.; Yang, Jae Hyuk; Park, Jung Ho

doi:10.1097/brs.0b013e318205e413

Cited by 34 publications

(24 citation statements)

References 30 publications

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“…Mean follow-up was 34 ± 6 months. The mean number of levels fused was 13.5 ± 1 (11)(12)(13)(14)(15). The number of UCs used for thoracic correction averaged 6.8 (5-10).…”

Section: Demographic Data and Operative Proceduresmentioning

confidence: 99%

“…The limitation of 2D radiological measurements and the clinical usefulness of measurements obtained from 3D reconstruction have been recently emphasized by the SRS ''3D Scoliosis Committee'' [10,11,20,25]. Preliminary 3D assessment of intervertebral deviation has already been performed by Hattori et al [26] using bone models, but stereoradiography allows a routine clinical use.…”

Section: Low Dose Biplanar Stereoradiographymentioning

confidence: 99%

“…Indeed, significant correlations between 3D parameters of deformities and clinical outcomes have been reported [11]. Computer scanning can be used for this type of analysis, but at the expense of high radiation exposure, and with the limitation of being performed in the supine position.…”

Section: Introductionmentioning

confidence: 99%

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Adolescent idiopathic scoliosis treated with posteromedial translation: radiologic evaluation with a 3D low-dose system

et al. 2013

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Purpose Computed tomography can be used for threedimensional (3D) evaluation of adolescent idiopathic scoliosis (AIS) patients, but at the expense of high radiation exposure, and with the limitation of being performed in the supine position. These drawbacks can now be avoided with low-dose stereoradiography, even in routine clinical use. The purpose of this study was to determine the 3D postoperative correction of AIS patients treated by posteromedial translation. Methods Forty-nine consecutive patients operated for AIS (Lenke 1-4) using posteromedial translation were included. Corrections were evaluated preoperatively, postoperatively and after at least 2 years using the EOS imaging system. 3D angles were measured in the plane of maximum deformity. Results Mean number of levels fused and operative time were 13.5 ± 1 and 215 ± 25 min, respectively. Main thoracic, proximal thoracic, and lumbar curves corrections averaged 64.4 ± 18, 31 ± 10 and 69 ± 20 %, respectively. Mean T4-T12 kyphosis increased 18.8°± 9°in the subgroup of hypokyphotic patients. Mean apical vertebral rotation reduction was 48.3 ± 20 %. Trunk height gain averaged 27.8 ± 14 mm. There was no pseudarthrosis or significant loss of correction in any plane during follow-up. Two patients (4 %) developed asymptomatic proximal junctional kyphosis, despite having normal thoracic kyphosis. Their sagittal balance was shifted posteriorly by 36 and 47 mm, respectively, by the operation, but revision surgery was not performed. Conclusions Low-dose stereoradiography provided 3D reconstructions of the fused and unfused spine in routine clinical use. Postoperative 3D analysis showed that posteromedial translation enhanced sagittal balance correction, without sacrificing frontal or axial correction of the deformity.

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“…Mean follow-up was 34 ± 6 months. The mean number of levels fused was 13.5 ± 1 (11)(12)(13)(14)(15). The number of UCs used for thoracic correction averaged 6.8 (5-10).…”

Section: Demographic Data and Operative Proceduresmentioning

confidence: 99%

Section: Low Dose Biplanar Stereoradiographymentioning

confidence: 99%

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Adolescent idiopathic scoliosis treated with posteromedial translation: radiologic evaluation with a 3D low-dose system

et al. 2013

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“…Apart from developing methods that can provide a more accurate 3D description of the spinal deformity of a scoliotic curvature, there is also a need to analyze how different measures describing spinal deformities relate to each other and to the clinical outcome [4,6,15]. This is important in order to classify various sub-types of idiopathic scoliosis and to determine if different treatments are suitable for the different sub-types of idiopathic scoliosis.…”

Section: Introductionmentioning

confidence: 99%

Eigenspine: Eigenvector Analysis of Spinal Deformities in Idiopathic Scoliosis

Forsberg

Lundström

Andersson

et al. 2014

Lecture Notes in Computational Vision and Biomechanics

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In this paper, we propose the concept of eigenspine, a data analysis scheme useful for quantifying the linear correlation between different measures relevant for describing spinal deformities associated with spinal diseases, such as idiopathic scoliosis. The proposed concept builds upon the use of principal component analysis (PCA) and canonical correlation analysis (CCA), where PCA is used to reduce the number of dimensions in the measurement space, thereby providing a regularization of the measurements, and where CCA is used to determine the linear dependence between pair-wise combinations of the different measures. To demonstrate the usefulness of the eigenspine concept, the measures describing position and rotation of the lumbar and the thoracic vertebrae of 22 patients suffering from idiopathic scoliosis were analyzed. The analysis showed that the strongest linear relationship is found between the anterior-posterior displacement and the sagittal rotation of the vertebrae, and that a somewhat weaker but still strong correlation is found between the lateral displacement and the frontal rotation of the vertebrae. These results are well in-line with the general understanding of idiopathic scoliosis. Noteworthy though is that the obtained results from the analysis further proposes axial vertebral rotation as a differentiating measure when characterizing idiopathic scoliosis. Apart from analyzing pair-wise linear correlations between different measures, the method is believed to be suitable for finding a maximally descriptive low-dimensional combination of measures describing spinal deformities in idiopathic scoliosis.

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“…Apart from developing methods that can provide a more accurate 3D description of spinal deformities, there is also a need to analyze how different measures describing spinal deformities relate to each other and to the clinical outcome [22,23,24]. This is important in order to classify various sub-types of idiopathic scoliosis and to determine if different treatments are suitable for the different sub-types of idiopathic scoliosis.…”

Section: Introductionmentioning

confidence: 99%

Eigenspine: Computing the correlation between measures describing vertebral pose for patients with adolescent idiopathic scoliosis

Forsberg

Lundström

Knutsson

2014

Computerized Medical Imaging and Graphics

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This paper describes the concept of eigenspine, a concept applicable for determining the correlation between pair-wise combinations of measures useful for describing the three-dimensional spinal deformities associated with adolescent idiopathic scoliosis. The proposed data analysis scheme is based upon the use of principal component analysis (PCA) and canonical correlation analysis (CCA). PCA is employed to reduce the dimensionality of the data space, thereby providing a regularization of the measurements, and CCA is employed to determine the linear dependence between pair-wise combinations of different measures. The usefulness of the eigenspine concept is demonstrated by analyzing the position and the rotation of all lumbar and thoracic vertebrae as obtained from 46 patients suffering from adolescent idiopathic scoliosis. The analysis showed that the strongest linear relationship is found between the lateral displacement and the coronal rotation of the vertebrae, and that a somewhat weaker but still strong correlation is found between the coronal rotation and the axial rotation of the vertebrae. These results are well in-line with the general understanding of idiopathic scoliosis. Noteworthy though is that the correlation between the anterior-posterior displacement and the sagittal rotation was not as strong as expected and that the obtained results further indicate the need for including the axial vertebral rotation as a measure when characterizing different types of idiopathic scoliosis. Apart from analyzing pair-wise correlations between different measures, the method is believed to be suitable for finding a maximally descriptive low-dimensional combination of measures describing spinal deformities in idiopathic scoliosis.

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Evaluation of the Three-Dimensional Deformities in Scoliosis Surgery With Computed Tomography

Cited by 34 publications

References 30 publications

Adolescent idiopathic scoliosis treated with posteromedial translation: radiologic evaluation with a 3D low-dose system

Adolescent idiopathic scoliosis treated with posteromedial translation: radiologic evaluation with a 3D low-dose system

Eigenspine: Eigenvector Analysis of Spinal Deformities in Idiopathic Scoliosis

Eigenspine: Computing the correlation between measures describing vertebral pose for patients with adolescent idiopathic scoliosis

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