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07.09.2018 | Original Article

Cervical and postural strategies for maintaining horizontal gaze in asymptomatic adults

verfasst von: Nour Khalil, Aren Joe Bizdikian, Ziad Bakouny, Michel Salameh, Naji Bou Zeid, Fares Yared, Joeffroy Otayek, Khalil Kharrat, Gaby Kreichati, Ismat Ghanem, Renaud Lafage, Virginie Lafage, Ibrahim Obeid, Ayman Assi

Erschienen in: European Spine Journal | Ausgabe 11/2018

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Abstract

Purpose

To investigate the different cervical strategies for maintaining horizontal gaze in asymptomatic subjects.

Methods

One hundred and forty-four asymptomatic adults filled the SF-36 quality of life questionnaire and underwent full-body biplanar radiographs. Chin brow vertical angle (CBVA) and postural and cervical parameters were measured. Subjects were grouped according to cervical spine curvature (C2–C7 angle): kyphotic (< − 5°), straight [− 5°, 5°], lordotic (> 5°). Demographics, SF-36 component scores and CBVA were compared between groups. All other parameters were compared between groups, while controlling for confounding factors (ANCOVA). A correlation test was conducted between all cervical parameters.

Results

32% of subjects had kyphotic (− 12° ± 7°), 27% straight (0° ± 3°) and 41% lordotic (12° ± 7°) cervical spines. While demographic and SF-36 data did not differ between groups, CBVA differed between lordotic and kyphotic groups (2° vs. 6.5°, p = 0.002). Sagittal vertical axis (SVA) and thoracic kyphosis (TK) were lower in the kyphotic group (SVA: K = − 26 ± 20 mm vs. L = − 2 ± 21 mm, p < 0.001; TK: K = 40° ± 6° vs. L = 51° ± 8°, p < 0.001). C2 slope (K = 29° ± 6° vs. L = 18° ± 6°, p < 0.001), C0–C2 (K = 42° ± 8° vs. L = 30° ± 8°, p < 0.001) and C1–C2 (K = 33° ± 6° vs. L = 28° ± 6°, p = 0.004) were higher in the kyphotic group. Significant correlations were found between almost all cervical parameters and C2–C7 angle.

Conclusions

Subjects with cervical kyphosis presented with more posterior global alignment and lower TK than subjects with lordosis. In order to maintain horizontal gaze, subjects with cervical kyphosis presented with a more lordotic upper cervical spine than subjects with cervical lordosis. Subjects with straight cervical curvature presented with an intermediate sagittal alignment.

Graphical abstract

These slides can be retrieved under Electronic Supplementary Material.

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Titel: Cervical and postural strategies for maintaining horizontal gaze in asymptomatic adults
verfasst von: Nour Khalil
Aren Joe Bizdikian
Ziad Bakouny
Michel Salameh
Naji Bou Zeid
Fares Yared
Joeffroy Otayek
Khalil Kharrat
Gaby Kreichati
Ismat Ghanem
Renaud Lafage
Virginie Lafage
Ibrahim Obeid
Ayman Assi
Publikationsdatum: 07.09.2018
Verlag: Springer Berlin Heidelberg
Erschienen in: European Spine Journal / Ausgabe 11/2018
Print ISSN: 0940-6719
Elektronische ISSN: 1432-0932
DOI: https://doi.org/10.1007/s00586-018-5753-3

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