Assessment of Angle velocity in girls with AIS

ScoliosisJournal report about Correction: Assessment of angle velocity in girls with adolescent idiopathic scoliosis

Authors: Ferran Escalada, Ester Marco, Roser Belmonte, Esther Duarte, Josep Ma Muniesa, Roser Boza, Marta Tejero and Enric Cáceres

Publiushed: 10 October 2009

Background
Although it has been demonstrated that the peak height velocity (PHV) is a predictive factor of progression in adolescent idiopathic scoliosis (AIS), little is known about the usefulness of angle progression in clinical practice. The purpose of this study was to establish a relationship between height and angle velocities, as well as to determine if peak angle velocity (PAV) occurs at the same time than PHV.

Methods
A retrospective study of a cohort of girls with idiopathic scoliotic curves greater than 10°. Data of 132 girls who participated in a previous retrospective study about growth in AIS were used to calculate height and angle velocities. Relationship between height and angle velocities was estimated by the use of a Linear Mixed Model.

Results
PHV and PAV take place simultaneously 1 year before menarche in progressive curves managed with a brace in AIS. Changes in angle velocity are influenced by changes in height growth velocity, in such a way that as from 6 months post-menarche, height growth velocity in this group of girls estimates curve progression velocity (β-coefficient -0.88, p = 0.04).

Conclusion
As from 6 months post-menarche, there is an inverse relationship between height velocity and curve progression in the group of AIS girls with progressive curves managed with a brace. Because height velocity is decreasing from 1 year before menarche, this finding corroborates that at the end of puberty, there is still a risk of progression in this group of girls despite bracing. The assessment of both height and angle velocity might be useful in clinical practice at the time of assessing brace effectiveness and how long bracing has to be indicated.

Correction
After publication of this work [1], we noted that we inadvertently failed to include the complete list of all coauthors. The full list of authors has now been added and the Authors' contributions and Competing interests section modified accordingly.

Competing Interests
The authors declare that they have no competing interests.

Authors' Contributions
FE conceived and designed the study, performed analysis and interpretation of data, carried the assessments and gave final approval of the version to be published. EM contributed to acquisition, analysis and interpretation of data and was involved in drafting the manuscript. RBe contributed to design, analysis and interpretation of data and reviewed the article critically for important intellectual content. ED and JMM revised critically for important intellectual contents. RBo and MT contributed to acquisition of data and analysis. EC participated in its design, revised critically for intellectual contents and gave final approval of the version to be published. All authors read and approved the final manuscript.

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