| Characterizing pelvis dynamics in adolescent with idiopathic scoliosis. | |
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MedLine Citation:
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PMID: 20628326 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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STUDY DESIGN: Pelvic dynamic analysis in adolescents with idiopathic scoliosis (AIS). OBJECTIVE: To examine and characterize pelvis dynamics in AIS. SUMMARY OF BACKGROUND DATA: Although studies have examined spine and pelvis postural differences between female adolescents with and without scoliosis much is still unknown about the dynamics of pelvis in trunk-pelvic interaction and how the type of scoliosis compromises pelvic mobility consequently affecting the overall dynamics of the trunk-pelvis kinematic chain. METHODS: A total of 25 female AIS (18 right thoracic: RT and 7 right thoracic-left lumbar: RTLL) and 12 controls were recruited. Reflective markers were placed on the trunk and pelvis and their trajectories were recorded using a 5-camera motion capture system. Three trials were carried out, one for each of the various trunk-pelvis movements (flexion/extension, lateral bend, and axial rotation on either side) performed by the subjects. RESULTS: Pelvic alignment in the 3 planes were significantly different for all movement types (P < 0.001), with distinct differences in pelvic sagittal tilt and transverse plane rotation, particularly during lateral bending and axial rotation in patients with RT and LL curves (P = 0.035, P = 0.006, respectively). A majority of the patients from the 2 scoliotic groups had the pelvis rotated to the side of the major curve (right). Although RT subjects had similar dynamic pelvic responses as the controls, the RT-LL patients had relatively more pelvic sagittal tilt during lateral bending and axial rotation toward the major curve. CONCLUSION: In AIS, the initial three-dimensional alignment of the pelvis (sagittal and frontal tilt, transverse plane rotation) plays an essential role in dictating the biomechanics of the pelvis for any movement type. A spatial concurrency in pelvic alignment was noted wherein a change in 1 parameter will affect the remaining 2. Increased pelvic sagittal tilt in the RT-LL subjects was substituted by more pelvic rotation in the RT subjects during trunk flexion/extension. Differences in pelvic dynamics in AIS are not evident in discrete parameters, for example, total ranges-of-motion but more so in its biomechanics during the movement, which in turn is dictated by the initial alignment of the pelvis. |
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Authors:
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Saba Pasha; Archana P Sangole; Carl-Eric Aubin; Stefan Parent; Jean-Marc Mac-Thiong; Hubert Labelle |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Spine Volume: 35 ISSN: 1528-1159 ISO Abbreviation: Spine Publication Date: 2010 Aug |
Date Detail:
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Created Date: 2010-08-04 Completed Date: 2010-11-12 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7610646 Medline TA: Spine (Phila Pa 1976) Country: United States |
Other Details:
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Languages: eng Pagination: E820-6 Citation Subset: IM |
Affiliation:
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Department of Mechanical Engineering, Ecole Polytechnique de Montréal, Montréal, Québec, Canada. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Adolescent Biomechanics / physiology Child Female Humans Lumbar Vertebrae / physiopathology* Pelvis / physiopathology* Range of Motion, Articular / physiology* Scoliosis / physiopathology* Thoracic Vertebrae / physiopathology* |
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