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Cervical and Thoracic Sagittal Curves in Thoracic Adolescent Idiopathic Scoliosis

  • Journal of Korean Society of Spine Surgery
  • Abbr : J Kor Spine Sur
  • 2009, 16(3), pp.167-172
  • Publisher : Korean Society Of Spine Surgery
  • Research Area : Medicine and Pharmacy > Orthopedic Surgery

김성수 1 김진혁 1 임동주 1 정창원 1 박신승 1 석세일 1

1인제대학교

Candidate

ABSTRACT

Study Design: Prospective study Objectives: To analyze and compare the cervical and thoracic sagittal curves between normal adolescents and patients with thoracic adolescent idiopathic scoliosis (AIS). Summary of Literature Review: There are no reports on cervical sagittal curves and its correlation with thoracic sagittal curves in AIS. Materials and Methods: The sagittal curves were analyzed in normal adolescents (N-adol group, n=23) and patients with thoracic AIS (AIS group, n=26) who had thoracic curves ≥ 45˚. Lateral standing radiographs of the cervical spine with a elbow straight and the whole spine with the hands on the clavicles were taken. The sagittal curves and balance were measured in the following segments; C2-C7, T2-T5, T5-12, T2-12, T12-S1. Cervical lordosis (C2-C7) was measured in both cervical spine radiographs and whole spine radiographs. Results: In the N-adol group, the cervical lordosis was 9.2±14.6˚in the cervical spine radiographs and -0.6±12.9˚(‘-’ means kyphosis) in whole spine radiographs. In the AIS group, cervical lordosis was -5.0±12.9˚in the cervical radiographs and -8.1± 12.7˚in the whole radiographs. The AIS group had significantly less cervical lordosis than the N-adol group. Thoracic kyphosis of T5-12 and T2-12 was 24.1±10.6˚and 38.9±13.1˚in the N-adol group, respectively, and 17.8±9.4˚and 30.1±11.8˚in the AIS group, respectively. There was a significant difference between the two groups (Ps<0.05). There was no significant difference in thoracic kyphosis of T2-T5, lumbar lordosis and sagittal balance between the two groups (Ps>0.05). In the AIS group, the cervical lordosis measured in the cervical spine radiograph showed a positive correlation with thoracic kyphosis of T2-5 (r=0.50, P=0.009) and T2-12 (r=0.57, P=0.003). Conclusions: AIS patients had significantly less cervical lordosis and thoracic kyphosis than normal adolescents. Decreased cervical lordosis in AIS had a significant correlation with their relative thoracic hypokyphosis.

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