Sequential assessment of spinal cord location in adolescent idiopathic scoliosis

Grant, Caroline A., Newell, Nicolas, Izatt, Maree T., Keenan, Bethany E., Little, J. Paige, Askin, Geoffrey N., Labrom, Robert D., Adam, Clayton J., & Pearcy, Mark J. (2016) Sequential assessment of spinal cord location in adolescent idiopathic scoliosis. In Spineweek 2016, 16 -20 May 2016, Singapore.


While the incidence of lasting neurological damage in adolescent idiopathic scoliosis (AIS) posterior surgical correction is low (below 1%), the location of the spinal cord within the spinal canal is still of concern. The incidence of medial encroachment of pedicle screws into the canal is reported as being 3.7%, though several authors report so called “safe zones” of screw protrusion up to 4mm. Given the current popularity of concave pedicle screws we investigated the location of the spinal cord in the canal in AIS. With the spinal cord taking the shortest route through the canal, the reported existence of “safe zones” for pedicle screw encroachment into the canal may not apply in the apical region of the scoliotic deformity. In the current study, the cord was found to be in contact with the apical concave pedicle 100% of the time for curves approaching operable size. It should also be noted that the Cobb angles of the curves analysed were mostly smaller than would be typical at surgical intervention. This study found that with increasing Cobb angle there was a corresponding increase in the incidence of contact between the spinal cord and the concave pedicle in the apical region of the deformity.

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ID Code: 97572
Item Type: Conference Item (Presentation)
Refereed: Yes
Keywords: spinal cord, spinal canal, adolescent idiopathic scoliosis, spine deformity, sequential MRI, magnetic resonance imaging, posterior instrumented fusion, pedicle screw
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > BIOMEDICAL ENGINEERING (090300) > Biomechanical Engineering (090302)
Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > CLINICAL SCIENCES (110300) > Orthopaedics (110314)
Divisions: Current > Institutes > Institute of Health and Biomedical Innovation
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: 2016 The Authors
Deposited On: 21 Jul 2016 23:59
Last Modified: 22 Jul 2017 14:50

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