Three-Dimensional Assessment of the Scoliosis

Legaye, Jean

doi:10.5772/38096

Cited by 4 publications

(3 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Correct placement of pedicle screws, in the lumbar and thoracic spine, needs to have a well 3D sensation and perception of the pedicle morphology for accurate identification of the ideal screw axis [ 4 , 5 ]. It has been a problem, due to variations in anatomical shapes, dimension and orientation, which can cause the inefficiencies of treatment or severe injury to neurological structure [ 6 , 7 ].…”

Section: Introductionmentioning

confidence: 99%

A medium invasiveness multi-level patient’s specific template for pedicle screw placement in the scoliosis surgery

et al. 2017

View full text Add to dashboard Cite

BackgroundSeveral methods including free-hand technique, fluoroscopic guidance, image-guided navigation, computer-assisted surgery system, robotic platform and patient’s specific templates are being used for pedicle screw placement. These methods have screw misplacements and are not always easy to be applied. Furthermore, it is necessary to expose completely a large portions of the spine in order to access fit entirely around the vertebrae.MethodsIn this study, a multi-level patient’s specific template with medium invasiveness was proposed for pedicle screw placement in the scoliosis surgery. It helps to solve the problems related to the soft tissues removal. After a computer tomography (CT) scan of the spine, the templates were designed based on surgical considerations. Each template was manufactured using three-dimensional printing technology under a semi-flexible post processing. The templates were placed on vertebras at four points—at the base of the superior-inferior articular processes on both left–right sides. This helps to obtain less invasive and more accurate procedure as well as true-stable and easy placement in a unique position. The accuracy of screw positions was confirmed by CT scan after screw placement.ResultsThe result showed the correct alignment in pedicle screw placement. In addition, the template has been initially tested on a metal wire series Moulage (height 70 cm and material is PVC). The results demonstrated that it could be possible to implement it on a real patient.ConclusionsThe proposed template significantly reduced screw misplacements, increased stability, and decreased the sliding & the intervention invasiveness.

show abstract

Section: Introductionmentioning

confidence: 99%

A medium invasiveness multi-level patient’s specific template for pedicle screw placement in the scoliosis surgery

et al. 2017

View full text Add to dashboard Cite

show abstract

“…These positive results are clinically valuable because of the importance of trunk asymmetry to the patient and their parents. [1][2][3][4] The Cobb angle is a paraclinical parameter that is a treatment sign for physicians and may not necessarily be patients' primary concern. 48,53 Adolescents with scoliosis and their parents participate in rehabilitations, expecting the treatment to improve visible trunk deformities.…”

Section: Trunk Asymmetrymentioning

confidence: 99%

“…In adolescents with idiopathic scoliosis (AIS), torso deformity and appearance manifestation are the most concerning aspects of the disease, especially for patients, and the common reason for referring to the physician. [1][2][3][4] Scoliosis deformations result from alterations in vertebral rotation, rib cage shape, and shoulder and pelvic joints orientation. 5,6 According to the Hueter-Volkmann principle, asymmetric loading of endplates in a scoliosis spine causes wedging of the vertebral body and curve progression by inhibiting growth in the concave side.…”

Section: Introductionmentioning

confidence: 99%

A new scoliosis brace padding method based on trunk asymmetry for scoliosis treatment

Bidari

Kamyab

Ganjavian

et al. 2023

Prosthetics &Amp; Orthotics International

View full text Add to dashboard Cite

Background: Pressure pads are used with scoliosis braces to adjust the magnitude and location of corrective forces that mechanically support the torso to correct the spine deformity. In the conventional brace (C.B.) design approaches, the location and shape of pads are determined based on the visual assessment of the clinician. The accuracy of this approach could be improved because it is limited to the clinician's expertise. The present study aimed to develop a new brace (N.B.) padding method based on trunk asymmetry for adolescents with idiopathic scoliosis and compare the efficacy of the developed method with C.B. in improving the Cobb angle and body posture symmetricity. Methods: The trunk surface geometry was scanned using a 3-dimensional scanner. The best plane of symmetry was determined, and the original trunk was reflected in the plane of symmetry, creating the reflected trunk. The difference between the reflected and original trunks was computed and color-coded using deviation contour maps. The boundary of deformed regions, with a minimum of 6-mm deviation contour maps, was identified as the trim lines for brace pads. Eight participants were recruited and divided into conventional and new padding groups. The variation of Cobb angle and torso asymmetry parameters, including the trunk rotation and back surface rotation, as well as the brace satisfaction and trunk appearance perception of the 2 groups, were compared after 3 months of treatment. Results: Cobb angle improved equally in the N.B. and C.B. groups. However, back surface rotation improved in the N.B. group (149.6%) and worsened in the C.B. group (26.8%). The mean trunk rotation was improved by 30% in the N.B. and further exacerbated by 22.2% in the C.B. group. The brace satisfaction and trunk appearance perception scores were higher in the N.B. than in the C.B. group, however not statistically significant.Conclusions: The present study showed that the proposed brace padding system improved the trunk appearance without negatively affecting the Cobb angle correction.

show abstract

A mechanical analog thoracolumbar spine model for the evaluation of scoliosis bracing technology

Chung

Kelly

Steele³

et al. 2018

Journal of Rehabilitation and Assistive Technologies Engineerin

View full text Add to dashboard Cite

Introduction Thoracolumbar braces are used to treat Adolescent Idiopathic Scoliosis. The objective of this study was to design and validate a mechanical analog model of the spine to simulate a thoracolumbar, single-curve, scoliotic deformity in order to quantify brace structural properties and corrective force response on the spine. Methods The Scoliosis Analog Model used a linkage-based system to replicate 3D kinematics of spinal correction observed in the clinic. The Scoliosis Analog Model is used with a robotic testing platform and programmed to simulate Cobb angle and axial rotation correction while equipped with a brace. The 3D force and moment responses generated by the brace in reaction to the simulated deformity were measured by six-axis load cells. Results Validation of the model’s force transmission showed less than 6% loss in the force analysis due to assembly friction. During simulation of 10° Cobb angle and 5° axial rotation correction, the brace applied 101 N upwards and 67 N inwards to the apical connector of the model. Brace stiffness properties were 0.5–0.6 N/° (anteroposterior), 0.5–2.3 N/° (mediolateral), 23.3–26.5 N/° (superoinferior), and 0.6 Nm/° (axial rotational). Conclusions The Scoliosis Analog Model was developed to provide first time measures of the multidirectional forces applied to the spine by a thoracolumbar brace. This test assembly could be used as a future design and testing tool for scoliosis brace technology.

show abstract

Three-Dimensional Assessment of the Scoliosis

Cited by 4 publications

References 47 publications

A medium invasiveness multi-level patient’s specific template for pedicle screw placement in the scoliosis surgery

A medium invasiveness multi-level patient’s specific template for pedicle screw placement in the scoliosis surgery

A new scoliosis brace padding method based on trunk asymmetry for scoliosis treatment

A mechanical analog thoracolumbar spine model for the evaluation of scoliosis bracing technology

Contact Info

Product

Resources

About