Access to a three-dimensional measure of vertebral axial rotation

Hecquet, J.; Legaye, Jean; Duval-Beaupère, G

doi:10.1007/s005860050057

Cited by 22 publications

(10 citation statements)

References 24 publications

(29 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Here the used specimen with a moderate scoliosis of 47°and a rotation of the apical vertebra of -14°revealed no clinically relevant change of the Cobb angle at rotational misalignments of ±20°in relation to a neutral plane. This model confirmed the reasonable reliability of Cobb angle and vertebral rotation measurements even with a rotational positioning error of ±20°within CR, BLR, and 3D model measurements based on BLR using CT as the reference standard [4,5,[15][16][17][18][19]. The error for Cobb angle measurements in this study between the different modalities at the neutral plane was 3°, which lies within the known intra-observer variation of ±5° [6][7][8][9].…”

Section: Discussionsupporting

confidence: 83%

Radiographic measurement error of the scoliotic curve angle depending on positioning of the patient and the side of scoliotic curve

et al. 2015

View full text Add to dashboard Cite

Background The Cobb angle measurement is well established for the measurement of coronal deformity aspect of scoliotic curves. The effect of positional differences in relation to the apex side of the scoliosis is not yet fully quantified. While theoretically plausible that positioning error with rotation toward the apex of the scoliosis would decrease the Cobb angle, the relations are not investigated yet and were object of this study. Materials and methods Multiple measurements of the Cobb angle were performed, while turning a spine-pelvic cadaveric specimen with a right-sided thoracic scoliosis of 47°(in neutral position) from 45°to -45°in steps of 5°u sing biplanar radiography. Statistical methods were applied to find the critical position, in which measurement errors potentially become clinically relevant (Cobb angle deviation [5°). Results Turning the specimen to the right (toward the apex of the scoliosis) produced during the first -15°of rotation, a Cobb angle ranging from 47°to 45°. At -20°, the Cobb angle was 42°, at -25°rotation 37°and at -30°r otation 36°. Above -30°rotation, the measured Cobb angle decreased to 36°(77 % of the original Cobb angle). No relevant differences were found by rotating the specimen to the left (away from the apex) (47°at neutral rotation and 44°at maximal error rotation of ?45°). Conclusion The influence of rotational misplacement of the patient at the time of image acquisition on Cobb angle measurements is negligible for a rotational misplacement of ±20°of rotation for a idiopathic right-sided thoracic scoliosis of 47°. Over 20°of rotational misplacement of the patient toward the apex of the scoliosis falsely decreases the Cobb angle.

show abstract

Section: Discussionsupporting

confidence: 83%

Radiographic measurement error of the scoliotic curve angle depending on positioning of the patient and the side of scoliotic curve

et al. 2015

View full text Add to dashboard Cite

show abstract

“…This condition can only be known as ES when it is symptomatic to facial structures. When styloid process becomes symptomatic, inflamed pain is produced by protrusion of tongue or by turning of the head [6]. An asymptomatic elongated styloid process found frequently in panoramic radiographs may be a significant and coincidental finding that leads the clinician to further investigate the possibilities of related systemic conditions (Figs.…”

Section: Discussionmentioning

confidence: 99%

Pain in the Neck: Are We Potentially at Risk?

Adibi¹,

Ogbureke²,

Ogbureke³

et al. 2017

J Med Cases

View full text Add to dashboard Cite

show abstract

“…Because fluoroscopic images are demonstrated in one single plane, it may be displayed as normal even though vertebral rotation in three-dimensional space exists. This artefactual rotation is named 'introduced vertebral rotation' by Hecquet et al [22]. The phenomenon will mislead surgeons, reducing the accuracy of pedicle screw placement.…”

Section: Discussionmentioning

confidence: 99%

Placement of pedicle screws using three-dimensional fluoroscopy-based navigation in lumbar vertebrae with axial rotation

Tian

Lang

2010

Eur Spine J

View full text Add to dashboard Cite

Despite potential advantages of three-dimensional fluoroscopy-based navigation, there still remain a lot of controversies about the indications of this technology, especially whether it is worthy of being used in placement of pedicle screws in lumbar spine. However, according to the inconsistent conclusions reported in the literature and our experiences, the traditional method relying on anatomical landmarks and fluoroscopic views to guide lumbar pedicle screw insertion is unable to meet the requirement of precise screw placement. Based on our observation, screw malposition seems to occur concomitant with vertebral axial rotation which is a ubiquitous phenomenon. Threedimensional fluoroscopy-based navigation can provide the most valuable axial images in real-time, so it may be useful for placement of pedicle screws in lumbar spine. This study was intended to evaluate the effect of axial rotation of lumbar vertebrae on the accuracy of pedicle screw placement using the traditional method, as well as assess the value of three-dimensional fluoroscopy-based navigation in improving the accuracy. Sixteen lumbar simulation models at different degrees of axial rotation (0°, 5°, 10°, and 20°), with every four assigned the same degree, were equally divided into two groups (traditional method group and three-dimensional fluoroscopy-based navigation group). Random placement of pedicle screws was carried out, followed by CT scan postoperatively. Then the outer pedicle cortex contours were depicted from reconstructed sectional pedicle images using Photoshop. The accuracy of pedicle screw placement was evaluated by determining the interrelationship between screw trajectory and pedicle cortex (quality), and measuring the shortest distance from pedicle screw axis to outer cortex of the pedicle (quantity). Eighty pedicle screws were implanted, respectively, in each group. In traditional method group, statistical difference existed in the accuracy of pedicle screw placement at different axial rotational degrees (P \ 0.05). With degrees increasing, the accuracy declined. The accuracy of threedimensional fluoroscopy-based navigation group was higher than traditional method group in vertebrae with axial rotation (P \ 0.01). In qualitative evaluation, the accuracy of the two methods had statistical difference when the degree was 20°, and in quantitative evaluation, statistical difference existed in 5°, 10°, and 20°of vertebral axial rotation.

show abstract

Access to a three-dimensional measure of vertebral axial rotation

Cited by 22 publications

References 24 publications

Radiographic measurement error of the scoliotic curve angle depending on positioning of the patient and the side of scoliotic curve

Radiographic measurement error of the scoliotic curve angle depending on positioning of the patient and the side of scoliotic curve

Pain in the Neck: Are We Potentially at Risk?

Placement of pedicle screws using three-dimensional fluoroscopy-based navigation in lumbar vertebrae with axial rotation

Contact Info

Product

Resources

About