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Pelvis Morphology, Trunk Posture and Standing Imbalance and Their Relations to the Cobb Angle in Moderate and Severe Untreated AIS

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  • Georges Dalleau
  • Pierre Leroyer
  • Marlène Beaulieu
  • Chantal Verkindt
  • Charles-Hilaire Rivard
  • Paul Allard

Abstract

Adolescent idiopathic scoliosis (AIS) is the most common form of scoliosis and usually affects young girls. Studies mostly describe the differences between scoliotic and non-scoliotic girls and focus primarily on a single set of parameters derived from spinal and pelvis morphology, posture or standing imbalance. No study addressed all these three biomechanical aspects simultaneously in pre-braced AIS girls of different scoliosis severity but with similar curve type and their interaction with scoliosis progression. The first objective of this study was to test if there are differences in these parameters between pre-braced AIS girls with a right thoracic scoliosis of moderate (less than 27°) and severe (more than 27°) deformity. The second objective was to identify which of these parameters are related to the Cobb angle progression either individually or in combination of thereof. Forty-five scoliotic girls, randomly selected by an orthopedic surgeon from the hospital scoliosis clinic, participated in this study. Parameters related to pelvis morphology, pelvis orientation, trunk posture and quiet standing balance were measured. Generally moderate pre-brace idiopathic scoliosis patients displayed lower values than the severe group characterized by a Cobb angle greater than 27°. Only pelvis morphology and trunk posture were statistically different between the groups while pelvis orientation and standing imbalance were similar in both groups. Statistically significant Pearson coefficients of correlation between individual parameters and Cobb angle ranged between 0.32 and 0.53. Collectively trunk posture, pelvis morphology and standing balance parameters are correlated with Cobb angle at 0.82. The results suggest that spinal deformity progression is not only a question of trunk morphology distortion by itself but is also related to pelvis asymmetrical bone growth and standing neuromuscular imbalance.

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  • Georges Dalleau & Pierre Leroyer & Marlène Beaulieu & Chantal Verkindt & Charles-Hilaire Rivard & Paul Allard, 2012. "Pelvis Morphology, Trunk Posture and Standing Imbalance and Their Relations to the Cobb Angle in Moderate and Severe Untreated AIS," PLOS ONE, Public Library of Science, vol. 7(7), pages 1-6, July.
    • Handle: RePEc:plo:pone00:0036755
    DOI: 10.1371/journal.pone.0036755
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    Cited by:

    1. Alberto Leardini & Lisa Berti & Mickaël Begon & Paul Allard, 2013. "Effect of Trunk Sagittal Attitude on Shoulder, Thorax and Pelvis Three-Dimensional Kinematics in Able-Bodied Subjects during Gait," PLOS ONE, Public Library of Science, vol. 8(10), pages 1-7, October.
    2. Georgios A Stylianides & Georges Dalleau & Mickaël Begon & Charles-Hilaire Rivard & Paul Allard, 2013. "Pelvic Morphology, Body Posture and Standing Balance Characteristics of Adolescent Able-Bodied and Idiopathic Scoliosis Girls," PLOS ONE, Public Library of Science, vol. 8(7), pages 1-1, July.
    3. Sophie-Anne Scherrer & Mickaël Begon & Alberto Leardini & Christine Coillard & Charles-Hilaire Rivard & Paul Allard, 2013. "Three-Dimensional Vertebral Wedging in Mild and Moderate Adolescent Idiopathic Scoliosis," PLOS ONE, Public Library of Science, vol. 8(8), pages 1-7, August.

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