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Effect of cervical flexion and extension on thoracic sagittal alignment
Takamitsu Konishi1, Kenji Endo1, Takato Aihara1
1Department of Orthopedic Surgery, Tokyo Medical University, Shinjuku-ku, Tokyo, Japan.
Journal of Orthopaedic Surgery (Hong Kong)
|October 11, 2019
Summary
Cervical spine movement significantly impacts thoracic alignment, particularly T1 slope and T5-T8 angles during flexion. This research clarifies how cervical changes affect thoracic sagittal alignment.
Area of Science:
- Spine biomechanics
- Orthopedic surgery
- Radiology
Background:
- Cervical spine motion influences overall spinal alignment.
- Detailed effects of cervical flexion/extension on thoracic alignment are not fully understood.
Purpose of the Study:
- To analyze changes in thoracic sagittal alignment during cervical flexion and extension.
Main Methods:
- 55 patients with degenerative spinal disease were analyzed.
- Measurements included occipito-axial angle, C2 slope, C2-C7 angle, T1 slope, thoracic kyphosis, and pelvic parameters in different cervical positions.
- Exclusion criteria included trauma, infection, tumor, and prior surgery.
Main Results:
- Cervical flexion decreased occipito-axial angle, C2-C7 angle, and T1 slope, while increasing C2 slope.
- Cervical extension showed opposite effects.
- Correlations between cervical and thoracic parameters varied with flexion and extension.
Conclusions:
- Cervical flexion affects T1 slope and T5-T8 angles, with no significant change in lower thoracic or spino-pelvic parameters.
- T2-T4 may serve as a stable fixation point in cervical corrective surgery.
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