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Do Adolescents With Idiopathic Scoliosis Have an Erroneous Perception of the Gravitational Vertical?

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Abstract

Study design

Multicenter, case-control study.

Objectives

Demonstrate altered perception of verticality in AIS compared with matched controls.

Summary of background data

The cause of adolescent idiopathic scoliosis (AIS) remains to be found. AIS is associated with neurosensorial anomalies, in particular, altered control of orthostatic posture. During kinetic activity, the upright posture, in humans, is determined in reference to the gravitational vertical (GV). We hypothesized that in AIS, there is a discordance in the perception of the GV and the true GV. In AIS, the longitudinal axis of the body would thus be misoriented because of an erroneous perception of the GV.

Methods

Thirty adolescents with right thoracic AIS (age 14.23 ± 1.75 years; Cobb angle 31.97°± 12.83°) and 30 controls matched for age (13.93 ± 1.85 years), body mass index, Tanner stage, and handedness were compared for subjective visual vertical (SVV) measured in static and dynamic (optokinetic stimulation) conditions, and subjective postural vertical (SPV).

Results

There was no difference in the two groups, AIS and controls, for SVV. The SPV was significantly different between the two groups (p = .00023). The SPV was shifted to the right for most of the AIS patients (2.13°± 2.22°) compared with controls (–0.08°±1.40°). There was a significant correlation between SPV and clinical frontal tilt in the AIS patients.

Conclusion

Our findings demonstrate that patients with right thoracic AIS have an erroneous perception of the GV. In most AIS patients, SPV was shifted to the right, with no alteration of the SVV. AIS might be the consequence of a reoriented longitudinal body axis aligned with an erroneous vertical reference. The underlying mechanism might involve dysfunction of trunk graviceptors. The primary or secondary nature of this dysfunction remains an open question.

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Authors and Affiliations

Authors

Corresponding author

Correspondence to Jean-François Catanzariti MD.

Additional information

Author disclosures: MLB (none), CP (none), AB (none), MC (none), CM (none), J-FC (none).

The authors declare no conflicts of interest.

Source of Funding: This study was funded by Fondation de l’Avenir (n° AP-RM-16-025).

Our regional review board (Comité de Protection des Personnes Nord Ouest IV) approved the study protocol (no. 2015 A00950 49–CPP 15 64).

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Le Berre, M., Pradeau, C., Brouillard, A. et al. Do Adolescents With Idiopathic Scoliosis Have an Erroneous Perception of the Gravitational Vertical?. Spine Deform 7, 71–79 (2019). https://doi.org/10.1016/j.jspd.2018.05.004

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  • DOI: https://doi.org/10.1016/j.jspd.2018.05.004

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