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Conference Paper: In-vivo demonstration of spontaneous apical vertebral derotation in thoracic adolescent idiopathic scoliosis

TitleIn-vivo demonstration of spontaneous apical vertebral derotation in thoracic adolescent idiopathic scoliosis
Authors
Issue Date2011
Citation
The 25th Triennial World Congress (SICOT 2011), Prague, Czech Republic, 6-9 September 2011. How to Cite?
AbstractINTRODUCTION: Adolescent idiopathic scoliosis (AIS) is a three-dimensional coupling deformity. Various studies have reported vertebral rotational effects with different implant constructs and surgical techniques for AIS. However, none of them has considered the spontaneous coupling effect on vertebral de-rotation produced by correction of coronal deformity. METHOD: Twenty-five AIS patients with Lenke type 1 with Cobb angles greater than 45° who underwent posterior spinal fusion with instrumentation without direct apical de-rotation were prospectively assessed. Cobb angles (CA) and apical vertebral rotations (AVR) in standing, supine and fulcrum bending positions preoperatively, and in supine position postoperatively, were assessed on x-rays and CT scans. RESULTS: The study entailed 80% females and 20% males (mean age, 15.5 years). The mean preoperative CA (AVR) in standing, supine and fulcrum bending positions were 56 (24), 41 (18), and 20 (10) degrees, respectively. The differences were statistically significant (p<0.05). The mean postoperative CA (AVR) was 15 (8) degrees. The mean difference in AVR between fulcrum bending and post-operation was 2 degrees (p=0.06). The postoperative supine AVR was significantly positively correlated with postoperative CA (r=0.82), and negatively correlated with change in curve magnitude (r=-0.49), correction rate (r=-0.83) and fulcrum bending correction index (r=-0.45) (p<0.05). CONCLUSIONS: Spontaneous apical de-rotation occurred concomitantly with correction of the coronal deformity. The amount of spontaneous AVR correction can be predicted with fulcrum bending radiographs. Such spontaneous de-rotation should be considered when assessing the effects with different implants and surgical strategies.
DescriptionDiscussion: Spine ‐ Special Topics: abstract no. 29952
Persistent Identifierhttp://hdl.handle.net/10722/165518

 

DC FieldValueLanguage
dc.contributor.authorLuk, KDKen_US
dc.contributor.authorCheung, WYen_US
dc.contributor.authorCheung, KMCen_US
dc.contributor.authorWong, YWen_US
dc.contributor.authorSamartzis, Den_US
dc.date.accessioned2012-09-20T08:19:19Z-
dc.date.available2012-09-20T08:19:19Z-
dc.date.issued2011en_US
dc.identifier.citationThe 25th Triennial World Congress (SICOT 2011), Prague, Czech Republic, 6-9 September 2011.en_US
dc.identifier.urihttp://hdl.handle.net/10722/165518-
dc.descriptionDiscussion: Spine ‐ Special Topics: abstract no. 29952-
dc.description.abstractINTRODUCTION: Adolescent idiopathic scoliosis (AIS) is a three-dimensional coupling deformity. Various studies have reported vertebral rotational effects with different implant constructs and surgical techniques for AIS. However, none of them has considered the spontaneous coupling effect on vertebral de-rotation produced by correction of coronal deformity. METHOD: Twenty-five AIS patients with Lenke type 1 with Cobb angles greater than 45° who underwent posterior spinal fusion with instrumentation without direct apical de-rotation were prospectively assessed. Cobb angles (CA) and apical vertebral rotations (AVR) in standing, supine and fulcrum bending positions preoperatively, and in supine position postoperatively, were assessed on x-rays and CT scans. RESULTS: The study entailed 80% females and 20% males (mean age, 15.5 years). The mean preoperative CA (AVR) in standing, supine and fulcrum bending positions were 56 (24), 41 (18), and 20 (10) degrees, respectively. The differences were statistically significant (p<0.05). The mean postoperative CA (AVR) was 15 (8) degrees. The mean difference in AVR between fulcrum bending and post-operation was 2 degrees (p=0.06). The postoperative supine AVR was significantly positively correlated with postoperative CA (r=0.82), and negatively correlated with change in curve magnitude (r=-0.49), correction rate (r=-0.83) and fulcrum bending correction index (r=-0.45) (p<0.05). CONCLUSIONS: Spontaneous apical de-rotation occurred concomitantly with correction of the coronal deformity. The amount of spontaneous AVR correction can be predicted with fulcrum bending radiographs. Such spontaneous de-rotation should be considered when assessing the effects with different implants and surgical strategies.-
dc.languageengen_US
dc.relation.ispartof25th Triennial World Congress, SICOT 2011en_US
dc.titleIn-vivo demonstration of spontaneous apical vertebral derotation in thoracic adolescent idiopathic scoliosisen_US
dc.typeConference_Paperen_US
dc.identifier.emailLuk, KDK: hcm21000@hku.hken_US
dc.identifier.emailCheung, WY: lcheung@hkucc.hku.hken_US
dc.identifier.emailCheung, KMC: cheungmc@hku.hken_US
dc.identifier.emailWong, YW: yatwa@hkucc.hku.hken_US
dc.identifier.emailSamartzis, D: dspine@hku.hken_US
dc.identifier.authorityLuk, KDK=rp00333en_US
dc.identifier.authorityCheung, KMC=rp00387en_US
dc.identifier.authoritySamartzis, D=rp01430en_US
dc.identifier.hkuros208422en_US
dc.identifier.hkuros255991-

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