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01-11-2013 | Original Article

Spinal coronal profiles and proximal femur bone mineral density in adolescent idiopathic scoliosis

Authors: Rui-Qiang Chen, Kota Watanabe, Naobumi Hosogane, Tomohiro Hikata, Akio Iwanami, Ken Ishii, Masaya Nakamura, Yoshiaki Toyama, Morio Matsumoto

Published in: European Spine Journal | Issue 11/2013

Abstract

Purpose

Although the occurrence and progression of AIS has been linked to low bone mineral density (BMD), the relationships between spinal curvature and bilateral differences in proximal femur BMD are controversial. Few correlation studies have stratified patients by curve type. The purpose of this study was to evaluate the relationships between spinal coronal profile and bilateral differences in proximal femur BMD in patients with adolescent idiopathic scoliosis (AIS).

Methods

This study included 67 patients with AIS who underwent posterior correction and fusion surgery between January 2009 and October 2011. The mean age at the time of surgery was 17.4 ± 4.1 years. Bilateral proximal femur BMD was measured before surgery by dual-energy X-ray absorptiometry. We compared the proximal femur BMDs by determining the bilateral BMD ratio (left proximal femur BMD divided by that of the right). We evaluated correlations between coronal parameters, obtained from preoperative radiographs, and the BMD ratio using Pearson’s correlation analysis.

Results

Patients with Lenke type 1 curve (48; all with a right convex curve) had a mean bilateral proximal femur BMD ratio of 1.00 ± 0.04. Patients with Lenke type 5 curve (19; all with a left convex curve) had a mean bilateral proximal femur BMD ratio of 0.94 ± 0.04, indicating that the BMD in the proximal femur on the right side (concave) was greater than that in the left (convex). Coronal balance was significantly correlated with the BMD ratio in both the Lenke type 1 and type 5 groups, with a correlation coefficient of 0.46 and 0.50, respectively.

Conclusions

The bilateral proximal femur BMD ratio was significantly correlated with the coronal balance in AIS patients. When the C7 plumb line was shifted toward one side, the BMD was greater in the contralateral proximal femur.

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Title: Spinal coronal profiles and proximal femur bone mineral density in adolescent idiopathic scoliosis
Authors: Rui-Qiang Chen
Kota Watanabe
Naobumi Hosogane
Tomohiro Hikata
Akio Iwanami
Ken Ishii
Masaya Nakamura
Yoshiaki Toyama
Morio Matsumoto
Publication date: 01-11-2013
Publisher: Springer Berlin Heidelberg
Published in: European Spine Journal / Issue 11/2013
Print ISSN: 0940-6719
Electronic ISSN: 1432-0932
DOI: https://doi.org/10.1007/s00586-013-2872-8

At a glance: The STEP trials

Springer Medicine

Spinal coronal profiles and proximal femur bone mineral density in adolescent idiopathic scoliosis

Abstract

Purpose

Methods

Results

Conclusions

At a glance: The STEP trials

Springer Medicine

Abstract

Purpose

Methods

Results

Conclusions

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