Email updates

Keep up to date with the latest news and content from Scoliosis and BioMed Central.

Open Access Highly Accessed Research

Differential wedging of vertebral body and intervertebral disc in thoracic and lumbar spine in adolescent idiopathic scoliosis – A cross sectional study in 150 patients

Hitesh N Modi1, Seung Woo Suh1*, Hae-Ryong Song2, Jae-Hyuk Yang1, Hak-Jun Kim3 and Chetna H Modi1

Author Affiliations

1 Scolioisis Research Institute, Dept of Orthopaedics, Korea University Guro Hospital, Seoul, Korea

2 Rare Disease Institute, Dept of Orthopaedics, Korea University Guro Hospital, Seoul, Korea

3 Veterans Severance Hospital, Dept of Orthopaedics, Seoul, Korea

For all author emails, please log on.

Scoliosis 2008, 3:11  doi:10.1186/1748-7161-3-11

Published: 13 August 2008

Abstract

Background

Hueter-Volkmann's law regarding growth modulation suggests that increased pressure on the end plate of bone retards the growth (Hueter) and conversely, reduced pressure accelerates the growth (Volkmann). Literature described the same principle in Rat-tail model. Human spine and its deformity i.e. scoliosis has also same kind of pattern during the growth period which causes wedging in disc or vertebral body.

Methods

This cross sectional study in 150 patients of adolescent idiopathic scoliosis was done to evaluate vertebral body and disc wedging in scoliosis and to compare the extent of differential wedging of body and disc, in thoracic and lumbar area. We measured wedging of vertebral bodies and discs, along with two adjacent vertebrae and disc, above and below the apex and evaluated them according to severity of curve (curve < 30° and curve > 30°) to find the relationship of vertebral body or disc wedging with scoliosis in thoracic and lumbar spine. We also compared the wedging and rotations of vertebrae.

Results

In both thoracic and lumbar curves, we found that greater the degree of scoliosis, greater the wedging in both disc and body and the degree of wedging was more at apex supporting the theory of growth retardation in stress concentration area. However, the degree of wedging in vertebral body is more than the disc in thoracic spine while the wedging was more in disc than body in lumbar spine. On comparing the wedging with the rotation, we did not find any significant relationship suggesting that it has no relation with rotation.

Conclusion

From our study, we can conclude that wedging in disc and body are increasing with progression on scoliosis and maximum at apex; however there is differential wedging of body and disc, in thoracic and lumbar area, that is vertebral body wedging is more profound in thoracic area while disc wedging is more profound in lumbar area which possibly form 'vicious cycle' by asymmetric loading to spine for the progression of curve.