Characteristics of Cobb angle distribution in the main thoracolumbar/lumbar curve in adolescent idiopathic scoliosis: A retrospective controlled clinical study.

Abstract:

:A single-center retrospective analysis of 46 patients with Lenke 5 adolescent idiopathic scoliosis (AIS).To compare Cobb angle distribution in different segments of the main thoracolumbar/lumbar curve in patients with Lenke 5 AIS, and differences in the lateral-bending flexibility, the correction rate, and correction index among these segments.No studies have been reported the ratio of the different segments to the main thoracolumbar/lumbar curve in terms of curve angle distribution, lateral-bending flexibility differences between these segments, and the correction rate when surgical instrumentations are used to correct scoliosis.Included in this study were 46 consecutive patients with Lenke 5 AIS. All of them received one-stage posterior correction and fusion with pedicle screw in the same center between January 2009 and January 2012. General data and radiological films before surgery, and at final follow-up were collected for further analysis. The wedging angles in the different discs were measured within main thoracolumbar/lumbar curve before and after surgery. This angle was also measured in the bending film. The preoperative flexibility, the correction rate, and the correction index of different disc segments were calculated.There were 44 (95.65%) female and 2 (4.35%) male included in this study, with the average age of 15.26 ± 2.19 years at the time of surgery. The mean Cobb angle was 45.09 ± 9.40°. The average disc wedge angles in AV - 2 (apex vetebrea-2), AV - 1, AV + 1, and AV + 2 segments were 5.59 ± 2.28°, 10.46 ± 3.41°, 9.85 ± 2.43°, 5.68 ± 2.80°, accounting for about 17.76%, 33.16%, 31.64%, and 17.44% of the Cobb angle in the main thoracolumbar/lumbar curve, respectively (P < .001). Flexibility of the supine lateral bending was 75.84%, 64.36%, 72.16% and 135.09% (P < .001), while the correction rates were 76.00%, 83.10%, 92.10%, and 109.65% (P < .001). The correction indexes were 1.16, 1.77, 2.02, and 1.11 for the disc of AV - 2, AV - 1, AV + 1, and AV + 2, respectively (P < .001).The disc angles are symmetric distribution in the main thoracolumbar/lumbar curve, and the distal segment is more flexible than the proximal/apical segments. Furthermore, the correction index is the highest in the apical vertebral segment.

journal_name

Medicine (Baltimore)

journal_title

Medicine

authors

Zhao J,Fan J,Shen H,Yang C,Chen Y,Li M

doi

10.1097/MD.0000000000011216

subject

Has Abstract

pub_date

2018-06-01 00:00:00

pages

e11216

issue

25

eissn

0025-7974

issn

1536-5964

pii

00005792-201806220-00082

journal_volume

97

pub_type

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