title: Changes of concave and convex rib-vertebral angle, angle difference and angle ratio in patients with right thoracic adolescent idiopathic scoliosis.
abstract: The aim of this study is to describe the radiological changes in rib-vertebral angles (RVAs), rib-vertebral angle differences (RVADs), and rib-vertebral angle ratios (RVARas) in patients with untreated right thoracic adolescent idiopathic scoliosis and to compare with the normal subjects. The concave and convex RVA from T1 to T12, the RVADs and the RVARas were measured on AP digital radiographs of 44 female patients with right convex idiopathic scoliosis and 14 normal females. Patients were divided into three groups: normal subjects (group 1), scoliotic patients with Cobb's angle equal or <30° (group 2) and scoliotic patients with Cobb's angle over 30° (group 3). Overall values (mean ± SD) of the RVAs on the concave side were 90.5° ± 17° in group 1, 90.3° ± 15.8° in group 2 and 88.8° ± 15.4° in group 3. On the convex side, values were 90.0° ± 17.3° in group 1, 86.3° ± 13.7° in group 2 and 80.7° ± 14.4° in group 3. Overall values (mean ± SD) of the RVADs at all levels were 0.5° ± 0.7° in group 1, 4.0° ± 4.8° in group 2 and 8.0° ± 4.0° in group 3. The RVARa values (mean ± SD) at all levels was 1.008° ± 0.012° in group 1, 1.041° ± 0.061° in group 2 and 1.102° ± 0.151° in group 3. RVAD and RVARa values in the scoliotic segment were greater in patients with untreated scoliosis over 30° than in patients with an untreated deformity of <30° or normal subjects. A significant effect between groups was observed for the RVA, RVAD and RVARa variables. Measurement of RVA, RVAD and RVARa should not only be performed at and around the apex of a thoracic spinal deformity, but also extended to the whole thoracic spine.
authors.affiliation: Paediatric Orthopaedic Unit, Department of Child and Adolescent, Faculty of Medicine, University of Geneva Hospitals, 6 Rue Willy Donzé, Geneva 14, Switzerland. canavese_federico@yahoo.fr
authors.forename: Federico
authors.initials: F
authors.lastname: Canavese
authors.forename: Katia
authors.initials: K
authors.lastname: Turcot
authors.forename: Jerôme
authors.initials: J
authors.lastname: Holveck
authors.forename: Agnés Dahl
authors.initials: AD
authors.lastname: Farhoumand
authors.forename: André
authors.initials: A
authors.lastname: Kaelin
mesh_terms: D000293:Adolescent; D000704:Analysis of Variance; D002648:Child; D005260:Female; D006801:Humans; D011859:Radiography; D012189:Retrospective Studies; D012272:Ribs / Q000000981:diagnostic imaging*; D012600:Scoliosis / Q000000981:diagnostic imaging*; D013904:Thoracic Vertebrae / Q000000981:diagnostic imaging*
references.citation: Spine (Phila Pa 1976). 1988 Oct;13(10):1087-90
references.pmid: 3206264
references.citation: Spine (Phila Pa 1976). 1994 Jan 15;19(2):159-64
references.pmid: 8153824
references.citation: J Spinal Disord. 2000 Apr;13(2):108-12
references.pmid: 10780684
references.citation: Acta Orthop Belg. 1992;58 Suppl 1:33-58
references.pmid: 1456018
references.citation: Eur Spine J. 1997;6(2):84-8
references.pmid: 9209873
references.citation: Spine (Phila Pa 1976). 2005 Jun 1;30(11):1283-6
references.pmid: 15928553
references.citation: Stud Health Technol Inform. 2008;140:263-8
references.pmid: 18810034
references.citation: Stud Health Technol Inform. 2002;91:20-4
references.pmid: 15457688
references.citation: J Anat. 1991 Oct;178:21-38
references.pmid: 1810928
references.citation: Spine (Phila Pa 1976). 1997 Jan 15;22(2):198-9
references.pmid: 9122801
references.citation: J Biomech. 1974 Nov;7(6):497-507
references.pmid: 4452675
references.citation: Spine (Phila Pa 1976). 1996 Jun 15;21(12):1423-9
references.pmid: 8792518
references.citation: Spine (Phila Pa 1976). 2002 Feb 1;27(3):E64-70
references.pmid: 11805710
references.citation: Spine (Phila Pa 1976). 1990 Feb;15(2):81-6
references.pmid: 2326716
references.citation: J Bone Joint Surg Br. 1972 May;54(2):230-43
references.pmid: 5034823
references.citation: J Spinal Disord Tech. 2009 Jul;22(5):367-71
references.pmid: 19525794
references.citation: Clin Orthop Relat Res. 1985 Dec;(201):205-9
references.pmid: 4064407
references.citation: Acta Orthop Scand. 1983 Aug;54(4):603-12
references.pmid: 6670476