Sitting Balance in Spinal Deformity

Smith, Ralph; Emans, John B.

doi:10.1097/00007632-199209000-00016

Cited by 59 publications

(41 citation statements)

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“…If the sensorimotor and proprioceptive information used to perform motor activities is perturbed, this is bound to affect the patients' motor strategies [23,36]. The spinal deformation associated with AIS, which involves all three spatial planes, results in the redistribution of body masses, as shown by the asymmetrical ischial thrust recorded in these patients in the sitting position [32] and the asymmetrical GRF exerted during the performance of motor tasks [5,29]. It was therefore proposed here to increase the inertia of the trunk by adding masses in order to establish how inertial parameters affect the patients' dynamic behaviour.…”

Section: Discussionmentioning

confidence: 99%

“…The standing posture reflected, through the modification of GRF, the global segmental organisation of the body [25,29]. Contrary to standing, seated posture enlightened the specific postural control of the trunk that allowed the assessment of specific balance strategies [28,32]. Standing and unstable balance presented similarities as higher variability, larger impulses and larger GRF displacements when facing AIS patients to control subjects [4,5].…”

Section: Discussionmentioning

confidence: 99%

“…In addition the relationship between the scoliotic curve severity and the dynamic perturbations was also remarkable for a AP movement (perpendicular to the frontal deformation). It appeared that to study the influence of the frontal curvature on muscular asymmetry, on ML displacements and on ischiatric support, the sagittal plane is the one of interest (force and AP movement) [17,28,32]. The extraction of an index taking into account the tridimensionality of the deformity would be differently correlated with the postural parameters.…”

Section: Discussionmentioning

confidence: 99%

“…In contrast, Smith et al [32] reported that the spinal curvature imply an increase of the variability and asymmetry forces. More precisely, in a sitting position, the AIS subjects showed that the lateral displacement [28], spinal muscle activity [17] and ischial thrust [32] are significantly larger on the convex side of the deformation than on the concave side. Nevertheless, in dynamical condition (seated balance and initiation step), the concavity side is systematically more disturbed than the convexity side [5,6].…”

Section: Introductionmentioning

confidence: 91%

“…AIS is a progressive growth disease that affects spinal anatomy, mobility, and left-right symmetry [3,21]. The AIS imply an asymmetrical trunk with asymmetrical posture which modify posturodynamic organisation [32]. In the processes underlying the control of scoliotic patients' postural balance, specific sensory factors may lead to the development of adaptive strategies [30].…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

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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