Sagittal Plane Analysis of the Spine and Pelvis in Adolescent Idiopathic Scoliosis According to the Coronal Curve Type

Mac-Thiong, Jean-Marc; Labelle, Hubert; Charlebois, Manon; Huot, Marie-Pierre; Guise, Jacques A. de

doi:10.1097/01.brs.0000067118.60199.d1

Cited by 187 publications

(158 citation statements)

References 51 publications

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“…The average value of PI in this group was 52.7°, which was similar to that of asymptomatic people (51.99°) [7], and also close to that of people with AIS as 57.3° [4]. We thought the nearly normal value of PI was the main reason for spontaneous adjustment of spine in spite of deformity.…”

Section: Analysis Of Various Spinal-pelvic Parameters and Lenke Classsupporting

confidence: 78%

“…We thought the nearly normal value of PI was the main reason for spontaneous adjustment of spine in spite of deformity. The average value of PT was also close to that of asymptomatic people (11.99°) [7], but was higher than that in other researches [4]. This implies that patients in Group CNK had a well-balanced spinal-pelvic linkage and were more liable to equilibrate.…”

Section: Analysis Of Various Spinal-pelvic Parameters and Lenke Classsupporting

confidence: 64%

“…Despite the investigations in the relationship between the curves and pelvic parameters [4], little effort was given to explore the relationship between the cervical alignment and global spinal curvature, both in coronal and sagittal planes, which could be instructive if an association between them is found. Hence, we retrospectively observed the morphological characteristics of the spine in a sagittal plane in 120 young idiopathic scoliotic patients, and analyzed their relationship with pelvic parameters.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of the cervical spine sagittal alignment in young idiopathic scoliosis: a morphological classification of 120 cases

Silvestre

Mouton

et al. 2013

Eur Spine J

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Purpose To analyze the relationship between the cervical spine and global spinal-pelvic alignment in young patients with idiopathic scoliosis based on a morphological classification, and to postulate the hypothesis that cervical kyphosis is a part of cervico-thoracic kyphosis in them. Methods 120 young patients with idiopathic scoliosis were recruited retrospectively between 2006 and 2011. The following values were measured and calculated: cervical angles (CA), cervico-thoracic angles (CTA), pelvic incidence (PI), pelvic tilt (PT), sacral slope (SS), spinal sacral angle (SSA), hip to C7/hip to sacrum, thoracic kyphosis (TK), lumbar lordosis (LL), Roussouly sagittal classification, Lenke Type Curve and Lumbar Modifier. The cervical curves were classified as lordosis, straight, sigmoid and kyphosis. They were categorized into four groups as cervical non-kyphosis group (CNK Group), cervical kyphosis group (CK Group), cervical-middle-thoracic kyphosis group (CMTK Group), and cervical-lower-thoracic kyphosis group (CLTK Group) according to their morphological characters of sagittal alignments. All parameters were compared and analyzed among groups. Results The incidence of cervical kyphosis was 40 % (48/ 120). The CA and the CTA were in significant correlation (r = 0.854, P = 0.00). The cervical spine alignments were revealed to be significantly different among groups (r = 85.04, P = 0.00). Significant differences among groups in CA, CTA and TK were also detected. A strong correlation between the group type and Lenke Lumbar Modifier was still seen (P \ 0.05). Fisher's exact test revealed that the individual vertebral body kyphosis and wedging were directly related to the overall cervical kyphosis (P = 0.00, respectively). Conclusion The cervical kyphosis is correlated with global sagittal alignment, and is a part of cervico-thoracic sagittal deformity in young patients with idiopathic scoliosis. Despite the deformity in cervical alignment, the global spine could still be well-balanced with spontaneous adjustment. The correlation between our grouping based on the morphological characteristics of the sagittal alignments and Lenke Lumbar Modifier suggests that the coupled motion principle be appropriate to explain the modifications both in coronal and sagittal planes.

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Section: Analysis Of Various Spinal-pelvic Parameters and Lenke Classsupporting

confidence: 78%

Section: Analysis Of Various Spinal-pelvic Parameters and Lenke Classsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

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Analysis of the cervical spine sagittal alignment in young idiopathic scoliosis: a morphological classification of 120 cases

Silvestre

Mouton

et al. 2013

Eur Spine J

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“…Because of its close relationship with the spine, many studies have investigated the influence of sacropelvic balance and morphology in the evaluation and treatment of spinal disorders, such as developmental spondylolisthesis [1][2][3][4][5][6][7][8][9][10][11][12], degenerative spondylolisthesis [13,14], adolescent idiopathic scoliosis [15][16][17], and adult spinal deformity [18][19][20]. Some authors have also raised the role of sacropelvic morphology and balance in the pathogenesis and surgical treatment of hip osteoarthritis [21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Age- and sex-related variations in sagittal sacropelvic morphology and balance in asymptomatic adults

et al. 2011

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Introduction Many studies suggest the importance of the sagittal sacropelvic balance and morphology in spinal and hip disorders. This study describes the normal age-and sex-related changes in sacropelvic morphology and balance in a prospective cohort of asymptomatic adults without spinal disorder. Materials and methods A prospective cohort of 709 asymptomatic adults without spinal pathology was recruited. There were 354 males and 355 females aged 37.9 ± 14.7 and 35.7 ± 13.9 years, respectively. For each subjects, pelvic incidence (PI), pelvic tilt (PT), and sacral slope (SS) were measured from standing lateral radiographs. Ratios of SS to PI (SS/PI), PT to PI (PT/PI), and PT to SS (PT/SS) were also calculated. Results There was no significant difference in PI (pelvic incidence), SS (sacral slope), PT (pelvic tilt), PT/PI, SS/PI, or PT/SS between males and females. The mean ± 2 standard deviations (SD) range was 32°-74°, 0°-27°, and 24°-55°for PI, PT and SS, respectively. The mean ± 2 SD range was greater than 0.5 for SS/PI and less than 0.5 for PT/PI. PI was not related to age in either sex group. PT, SS, PT/PI, SS/PI, and PT/SS presented only weak correlation coefficients (r B 0.21) with respect to age. Conclusion The current study presents the largest cohort of asymptomatic adults in the literature dedicated to the evaluation of sagittal sacropelvic morphology and balance. The range of values corresponding to the mean ± 2 SD can provide invaluable information to clinicians about the normal range of values expected in 95% of the normal population.

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“…Variations in thoracic kyphosis and lumbar lordosis accompanying structural scoliosis are significantly related to coronal curve size and pelvic tilt [10].…”

Section: Introductionmentioning

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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Sagittal Plane Analysis of the Spine and Pelvis in Adolescent Idiopathic Scoliosis According to the Coronal Curve Type

Cited by 187 publications

References 51 publications

Analysis of the cervical spine sagittal alignment in young idiopathic scoliosis: a morphological classification of 120 cases

Analysis of the cervical spine sagittal alignment in young idiopathic scoliosis: a morphological classification of 120 cases

Age- and sex-related variations in sagittal sacropelvic morphology and balance in asymptomatic adults

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

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