Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2020 Aug 13:8:963.
doi: 10.3389/fbioe.2020.00963. eCollection 2020.

Determination of Three-Dimensional Corrective Force in Adolescent Idiopathic Scoliosis and Biomechanical Finite Element Analysis

Tianmin Guan  1 , Yufang Zhang  1 , Adeel Anwar  2 , Yufen Zhang  3 , Lina Wang  4
Affiliations

Determination of Three-Dimensional Corrective Force in Adolescent Idiopathic Scoliosis and Biomechanical Finite Element Analysis

Tianmin Guan et al. Front Bioeng Biotechnol. .

Abstract

Aims: In this study we have considered the three dimensional corrective forces for correction of scoliosis by using a patient specific finite element model.

Materials and methods: An objective function of corrective forces in three-dimensional space was defined. Computed tomography images were used to reconstruct three dimensional model of scoliotic trunk. Computer aided engineering software Abaqus was used to establish finite element model of deformed spine and its biomechanical characteristics were analyzed. By adjusting magnitude and position of corrective forces, objective function was minimized to achieve best orthopedic effect. The proposed corrective conditions were divided into three groups: (1) thoracic deformity; (2) lumbar deformity; (3) both thoracic and lumbar deformities were considered.

Results: In all three cases, the objective function was reduced by 58, 52, and 63%, respectively. The best correction forces point was located on convex side of maximum displacement of vertebral body.

Conclusion: Using minimum objective function method, spinal deformity in three-dimensional space can be sufficiently reduced. This study provides scientific basis for design of a new corrective brace for treatment of scoliosis.

Keywords: adolescent idiopathic scoliosis; brace; corrective forces; finite element modeling; three dimensional correction.

PubMed Disclaimer

Figures

FIGURE 1
FIGURE 1
Finite element model of patient trunk. (A) Constructing the internal structure of human body by using three-dimensional reconstruction technology of CT data. (B) Skeleton model, (C) Organ model, (D) Soft tissue, (E) Muscles, (F) All model, and (G) Finite element model.
FIGURE 2
FIGURE 2
Representation of variables in a three-dimensional view. (A) Coronal plan, (B) Sagittal plan, (C) Transverse plan, (D) Vertebral rotation angle.
FIGURE 3
FIGURE 3
Force position.
FIGURE 4
FIGURE 4
Displacement nephogram. (A) Left and right side bending, (B) Flexion and extension, and (C) Twist around.
FIGURE 5
FIGURE 5
Finite element model verification.
FIGURE 6
FIGURE 6
Spine stress under different strap tension. (A) 20N trap tension, (B) 40N trap tension, and (C) 60N trap tension.
FIGURE 7
FIGURE 7
Displacement variables.
FIGURE 8
FIGURE 8
Stress variation.
FIGURE 9
FIGURE 9
Changes in the curvature of the spine with different correction forces.
See this image and copyright information in PMC

References

    1. Andriacchi T. P., Schultz A. B., Belytschko T. B., Dewald R. (1976). Milwaukee brace correction of idiopathic scoliosis. A biomechanical analysis and a restrospective study. J. Bone Joint Surg. Am. 58 806–815. 10.2106/00004623-197658060-00011 - DOI - PubMed
    1. Aubin C. E., Dansereau J., De Guise J. A., Labelle H. (1996). A study of biomechanical coupling between spine and rib cage in the treatment by orthosis of scoliosis. Ann. Chirurgie 50 641–650. - PubMed
    1. Brown N., Saputa C., Black J. (1981). “Young’s modulus of living human bone transactions of the orthopaedic research society,” in Proceedings fo the Transactions of the Orthopaedic Research Society, 27th Annual Meeting, Boston, MA.
    1. Castro F. P. (2003). Adolescent idiopathic scoliosis, bracing, and the Hueter-Volkmann principle. Spine J. 3 180–185. 10.1016/s1529-9430(02)00557-0 - DOI - PubMed
    1. Chase A., Bader D., Mehta M. H. (1986). Long-term follow-up of fused and unfused idiopathic scoliosis. Follow-up results in 295 patients. Spine 70 712–716. 10.1302/0301-620x.70b5.3192566 - DOI - PubMed

LinkOut - more resources