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Segmental torso masses in adolescent idiopathic scoliosis

Keenan, Bethany ORCID:, Izatt, Maree T., Askin, Geoffrey N., Labrom, Robert D., Pettet, Graeme J., Pearcy, Mark J. and Adam, Clayton J. 2014. Segmental torso masses in adolescent idiopathic scoliosis. Clinical Biomechanics 29 (7) , pp. 773-779. 10.1016/j.clinbiomech.2014.06.002

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Background Adolescent idiopathic scoliosis is the most common type of spinal deformity whose aetiology remains unclear. Studies suggest that gravitational forces in the standing position play an important role in scoliosis progression, therefore anthropometric data is required to develop biomechanical models of the deformity. Few studies have analysed the trunk by vertebral level and none have performed investigations of the scoliotic trunk. The aim of this study was to determine the centroid, thickness, volume and estimated mass, for sections of the scoliotic trunk. Methods Existing low-dose CT scans were used to estimate vertebral level-by-level torso masses for 20 female adolescent idiopathic scoliosis patients. ImageJ processing software was used to analyse the CT images and enable estimation of the segmental torso mass corresponding to each vertebral level. Findings The patients' mean age was 15.0 (SD 2.7) years with mean major Cobb angle of 52 (SD 5.9)° and mean patient weight of 58.2 (SD 11.6) kg. The magnitude of torso segment mass corresponding to each vertebral level increased by 150% from 0.6 kg at T1 to 1.5 kg at L5. Similarly, segmental thickness from T1–L5 increased inferiorly from a mean 18.5 (SD 2.2) mm at T1 to 32.8 (SD 3.4) mm at L5. The mean total trunk mass, as a percentage of total body mass, was 27.8 (SD 0.5) % which was close to values reported in previous literature. Interpretation This study provides new anthropometric reference data on segmental (vertebral level-by-level) torso mass in adolescent idiopathic scoliosis patients, useful for biomechanical models of scoliosis progression and treatment.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Publisher: Elsevier
ISSN: 0268-0033
Date of Acceptance: 2 June 2014
Last Modified: 01 Nov 2022 11:27

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