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Differences in cervical sagittal parameters and muscular function among subjects with different cervical spine
Dian Wang1, Shuanghe Liu2, Yibo Liu2
1Department of Orthopaedic Surgery, Beijing Anzhen Hospital, Capital Medical University, Beijing, China.
Peerj
|September 30, 2024
Summary
Cervical kyphosis types show distinct sagittal parameters and muscle function. R-type kyphosis exhibited poorer muscle function (flexion-relaxation ratio and co-contraction ratio) compared to other types.
Area of Science:
- Orthopedics
- Biomechanical Engineering
- Spine Surgery
Background:
- Cervical kyphosis, characterized by abnormal inward curvature of the cervical spine, impacts sagittal alignment and neck function.
- Understanding variations in cervical sagittal parameters and muscular function across different kyphosis types is crucial for diagnosis and treatment.
Purpose of the Study:
- To analyze and compare cervical sagittal parameters and neck/shoulder muscular function in individuals with cervical lordosis versus various types of cervical kyphosis (C-, S-, and R-type).
- To investigate the correlations between clinical outcomes (VAS, NDI) and objective biomechanical measures.
Main Methods:
- Cross-sectional study involving subjects with cervical lordosis or degenerative cervical kyphosis.
- Measurement of cervical sagittal parameters (Cobb angle, T1 slope, SVA, SCA) and muscular function indices (flexion-relaxation ratio - FRR, co-contraction ratio - CCR) using surface electromyography.
- Statistical analysis of differences and correlations between parameters, clinical scores, and kyphosis types.
Main Results:
- Individuals with cervical lordosis demonstrated higher FRR in splenius capitis (SPL), upper trapezius (UTr), and sternocleidomastoid (SCM) compared to those with cervical kyphosis.
- FRRSPL was significantly higher in C-type kyphosis than R- and S-types and correlated with VAS, Cobb, T1S, and SVA.
- R-type kyphosis showed significantly worse FRR and CCR compared to other kyphosis types, indicating impaired cervical muscular function.
Conclusions:
- Cervical sagittal parameters and muscular functions vary significantly among different cervical kyphosis types.
- Impaired cervical muscular function, particularly evident in R-type kyphosis, is associated with specific sagittal alignment parameters.
- These findings highlight the importance of assessing both morphology and muscle function in managing cervical kyphosis.
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