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KMID : 0388720200270040125
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Journal of Korean Society of Spine Surgery
2020 Volume.27 No. 4 p.125 ~ p.130
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Efficacy of Dynamic Radiographs in Routine Evaluations for Degenerative Cervical Spine Disease
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Shin Chung-Shik
Kim Jin-Hong
Song Kyung-Jin
Choi Byung-Wan
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Abstract
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Study Design: Retrospective study.
Objectives: To analyze the usefulness of flexion-extension radiographs in the diagnosis of degenerative cervical disease.
Summary of Literature Review: There is little information about the efficacy of flexion-extension radiographs in the diagnosis of degenerative cervical disease.
Methods and Materials: We analyzed 1,062 patients with cervical degenerative disease who underwent flexion-extension radiographs and computed tomography (CT) or magnetic resonance imaging (MRI). The range of motion of the cervical joints was measured. Segmental instability was evaluated using the sagittal translation (≥3.5 mm) between C2 and T1, the sagittal angulation (≥3.5°), the vertebral slip angle (≥ 10°), and the dynamic spinal canal stenosis (≤12 mm). The relationship between canal compromise on CT or MRI and radiological instability was also evaluated.
Results: Cervical range of motion was 36.45°±17.63° (range, 2.1°?106.6°). Segmental instability was observed in 484 patients (nine cases of sagittal translation, 79 cases of sagittal plane rotation, 415 cases of a vertical slip angle, and 21 cases of dynamic spinal stenosis). Segmental instability was related with pathology in 218 patients with available CT or MRI (42%, including five cases of sagittal translation, 32 cases of sagittal plane rotation, 171 cases of vertical slip angle, and 10 cases of dynamic spinal stenosis.
Conclusions: Flexion-extension radiographs of the cervical spine were useful in diagnosing and evaluating subaxial segmental instability.
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KEYWORD
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Cervical spine disease, Segmental instability, Synamic radiographs
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