Perception of vertical and horizontal orientation in children with scoliosis

Cheung, John; Sluiter, Wim J.; Veldhuizen, Albert G.; Cool, J.C.; Horn, J.R. van

doi:10.1016/s0736-0266(01)00129-2

Cited by 27 publications

(17 citation statements)

References 25 publications

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“…The visual system seemed to be related to scoliosis aetiology; children suffering from a visual disability presented sixfold AIS than children without visual pathology [4]. In addition, the angle between the subjective spatial perception of horizontal and vertical planes increased in the scoliotic group, especially when the curvature was more significant [9]. This suggested that the scoliotic patient organized and stabilized his balance according to an incorrect spatial reference.…”

Section: Introductionmentioning

confidence: 98%

Dynamical asymmetries in idiopathic scoliosis during forward and lateral initiation step

et al. 2009

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Adolescent idiopathic scoliosis (AIS) is characterized by morphological trunk modifications acting on body mass distribution. Some specific biomechanical strategies during postural regulation have been reported. Given that spinal deformity is three-dimensional, some strategy analysis resulting from different stepping directions should lead to a better understanding of the dynamic adaptation of behaviour. The aim of this study is to identify dynamic strategies of AIS patients stepping in lateral and forward directions. Ten AIS patients with a right thoracic curve and 15 controlled volunteers have been tested. Ground reaction forces (GRF) have been recorded for rightlimb stepping and for left-limb stepping associated to forward and lateral directions. Force amplitudes, corresponding occurrences, impulses of stepping phases and an asymmetry index have been computed. Asymmetry and variability increased in the AIS group, compared to the control group, whatever the stepping direction is. Asymmetry for AIS patients systematically provides an increased left initiation GRF compared to a right initiation. Nevertheless, for both groups, lateral initiation shows the largest asymmetry index reported for a forward initiation. More precisely, adaptive dynamic strategies for the AIS group have been characterized by an asymmetry between right and left limbs for lateral and forward initiation. These results can be explained by the influence of scoliosis pathology on dynamic movements due to spinal deformity. A right thoracic curve leads to an extra weight on the limb, which needs to be moved; consequently, stepping initiation with the right limb was more challenging for patients than stepping with the left limb. For the AIS group, the observed variability can also depend on the ontogenesis of adaptive strategies. Lateral step initiation has to be considered as the most relevant paradigm to study scoliosis and may also serve as a clinical basis for treatment to analyse the dynamic postural control and asymmetry strategies of the scoliosis patient.

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Section: Introductionmentioning

confidence: 98%

Dynamical asymmetries in idiopathic scoliosis during forward and lateral initiation step

et al. 2009

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“…These strategies in seated position are, therefore, similar to those obtained during locomotion [16], lateral step [4], gait initiation [5] and in the standing position [8]. These dynamic strategies also constitute an adaptive response to sensorimotor deficits [7,15,27] and scoliotic patients' impaired spatial perception during dynamic postural control [9]. If the sensorimotor and proprioceptive information used to perform motor activities is perturbed, this is bound to affect the patients' motor strategies [23,36].…”

Section: Discussionmentioning

confidence: 83%

Idiopathic scoliosis: relations between the Cobb angle and the dynamical strategies when sitting on a seesaw

Bruyneel¹,

Chavet²,

Ebermeyer³

et al. 2010

Eur Spine J

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The aim of this study was to determine the influence of the severity of the spinal curve on the postural regulation when self-imposed disturbances occur in a seated position in anteroposterior (AP) and mediolateral (ML) orientations. Twelve female adolescents with a right thoracic scoliosis (Cobb = 30.4°± 9.7) were included in this study. The ground reaction forces (GRF) were studied while the subjects were maintaining their sitting on a seesaw (ML or AP destabilisation). Five conditions were tested: eyes open; with additional loads placed onto the subject's right or left shoulder; or onto the subject's right or left pelvis. We tested the correlation between the Cobb angle and the postural parameters (index of performance and GRF variability) for each condition. When the destabilisation was AP, the Cobb angle was significantly correlated with GRF variability and anterior and concavity index of performance. Two conditions showed higher correlations: stabilisation with the concavity pelvis load (GRF variability) and the open eyes (index of performance). In contrast, whatever the condition tested was, no link was found when the destabilisations were applied in ML direction. The destabilisation in a seated position highlights the influence of the curve severity on the postural organisation. In seated position, the postural control strategies specific to the scoliotic patients were always correlated by severity of curve, especially when the destabilisation is applied in AP directions. This study showed that the unstable seating position can be considered as a pertinent paradigm to help finding a postural clinical index for adolescent idiopathic scoliosis.

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“…The authors hypothesized that learning deficits, altered visual/vestibular information processing and behavioral patterns, and scoliosis were interrelated. Until now, however, little attention has been paid to the role of the cerebral domain in the CNS, which might result in altered functional behavior after the occurrence or progression of scoliosis (Herman et al, 1985; Cheung et al, 2002; Beaulieu et al, 2009). …”

Section: Introductionmentioning

confidence: 99%

“…Cheung et al (2002) examined the SVV performance of adolescents with spinal deformity by instructing them to adjust a laser line projection to match the direction of gravity while standing. Equivalent accuracy of SVV performance was reported among AIS subjects, adolescents with congenital scoliosis, and age-matched controls.…”

Section: Introductionmentioning

confidence: 99%

Effect of Postural Control Demands on Early Visual Evoked Potentials during a Subjective Visual Vertical Perception Task in Adolescents with Idiopathic Scoliosis

Chang

Meng

Chang

et al. 2017

Front. Hum. Neurosci.

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Subjective visual vertical (SVV) judgment and standing stability were separately investigated among patients with adolescent idiopathic scoliosis (AIS). Although, one study has investigated the central mechanism of stability control in the AIS population, the relationships between SVV, decreased standing stability, and AIS have never been investigated. Through event-related potentials (ERPs), the present study examined the effect of postural control demands (PDs) on AIS central mechanisms related to SVV judgment and standing stability to elucidate the time-serial stability control process. Thirteen AIS subjects (AIS group) and 13 age-matched adolescents (control group) aged 12–18 years were recruited. Each subject had to complete an SVV task (i.e., the modified rod-and-frame [mRAF] test) as a stimulus, with online electroencephalogram recording being performed in the following three standing postures: feet shoulder-width apart standing, feet together standing, and tandem standing. The behavioral performance in terms of postural stability (center of pressure excursion), SVV (accuracy and reaction time), and mRAF-locked ERPs (mean amplitude and peak latency of the P1, N1, and P2 components) was then compared between the AIS and control groups. In the behavioral domain, the results revealed that only the AIS group demonstrated a significantly accelerated SVV reaction time as the PDs increased. In the cerebral domain, significantly larger P2 mean amplitudes were observed during both feet shoulder-width-apart standing and feet together standing postures compared with during tandem standing. No group differences were noted in the cerebral domain. The results indicated that (1) during the dual-task paradigm, a differential behavioral strategy of accelerated SVV reaction time was observed in the AIS group only when the PDs increased and (2) the decrease in P2 mean amplitudes with the increase in the PD levels might be direct evidence of the competition for central processing attentional resources under the dual-task postural control paradigm.

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Perception of vertical and horizontal orientation in children with scoliosis

Cited by 27 publications

References 25 publications

Dynamical asymmetries in idiopathic scoliosis during forward and lateral initiation step

Dynamical asymmetries in idiopathic scoliosis during forward and lateral initiation step

Idiopathic scoliosis: relations between the Cobb angle and the dynamical strategies when sitting on a seesaw

Effect of Postural Control Demands on Early Visual Evoked Potentials during a Subjective Visual Vertical Perception Task in Adolescents with Idiopathic Scoliosis

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