Investigating the change in three dimensional deformity for idiopathic scoliosis using axially loaded MRI
Little, J.P., Izatt, M.T., Labrom, R.D., Askin, G.N., & Adam, C.J. (2012) Investigating the change in three dimensional deformity for idiopathic scoliosis using axially loaded MRI. Clinical Biomechanics, 27(5), pp. 415-421.
Background: Adolescent idiopathic scoliosis is a complex three-dimensional deformity, involving a lateral deformity in the coronal plane and axial rotation of the vertebrae in the transverse plane. Gravitational loading plays an important biomechanical role in governing the coronal deformity, however, less is known about how they influence the axial deformity. This study investigates the change in three-dimensional deformity of a series of scoliosis patients due to compressive axial loading.
Methods: Magnetic resonance imaging scans were obtained and coronal deformity (measured using the coronal Cobb angle) and axial rotations measured for a group of 18 scoliosis patients (Mean major Cobb angle was 43.4 o). Each patient was scanned in an unloaded and loaded condition while compressive loads equivalent to 50% body mass were applied using a custom developed compressive device.
Findings: The mean increase in major Cobb angle due to compressive loading was 7.4 o (SD 3.5 o). The most axially rotated vertebra was observed at the apex of the structural curve and the largest average intravertebral rotations were observed toward the limits of the coronal deformity. A level-wise comparison showed no significant difference between the average loaded and unloaded vertebral axial rotations (intra-observer error = 2.56 o) or intravertebral rotations at each spinal level.
Interpretation: This study suggests that the biomechanical effects of axial loading primarily influence the coronal deformity, with no significant change in vertebral axial rotation or intravertebral rotation observed between the unloaded and loaded condition. However, the magnitude of changes in vertebral rotation with compressive loading may have been too small to detect given the resolution of the current technique.
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|Item Type:||Journal Article|
|Keywords:||Axial compression, Biomechanics, Inter-vertebral rotation, Intravertebral rotation, MRI, Scoliosis, Adolescent idiopathic scoliosis, Axial loading, Axial rotation, Biomechanical effects, Body mass, Compressive loading, Compressive loads, Coronal planes, Gravitational loading, Idiopathic scoliosis, Intra-observer errors, Transverse planes, Axial loads, Deformation, Loading, Magnetic resonance imaging, Musculoskeletal system, Three dimensional, Rotation, adolescent, adult, article, child, clinical article, compression, human, image analysis, load carrying capacity, nuclear magnetic resonance imaging, priority journal, school child, spine malformation, three dimensional imaging|
|Subjects:||Australian and New Zealand Standard Research Classification > ENGINEERING (090000)|
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000)
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering|
Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Deposited On:||18 Jun 2012 08:17|
|Last Modified:||25 Feb 2013 05:57|
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