Dynamic imaging is well established for evaluating cervical myelopathy but is less commonly utilized for cervical radiculopathy. Typically, cervical radiculopathy is diagnosed using static imaging modalities such as CT or MRI. However, recent studies have demonstrated that spinal disorders can be dynamic in nature and may not be fully captured with static imaging alone. Dynamic MRI (dMRI), performed with the neck in flexion and extension, can assist both in diagnosis and surgical planning. We report two cases of cervical radiculopathy with persistent symptoms despite normal findings on standard static imaging. A dMRI sequence was performed to better visualize the underlying pathology. Notably, movement-dependent changes in the width of the spinal canal were observed. Both patients subsequently underwent artificial disc arthroplasty and experienced complete resolution of their symptoms. While dMRI is not necessary for all patients with spinal conditions, it may offer significant diagnostic value in those with persistent symptoms and inconclusive static imaging. Additionally, it can help clarify spinal anatomy and enhance the precision of surgical planning.

Keywords: dynamic imaging; extension; flexion; myelopathy; radiculopathy.

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动态成像在评估颈椎病方面已得到广泛应用，但在诊断颈椎根性病变时则较少使用。通常情况下，颈椎根性病变是通过静态影像学检查如CT或MRI来诊断的。然而，近期研究显示脊柱疾病具有动态性质，在仅采用静态影像学检查的情况下可能无法完全捕捉到所有情况。进行颈部屈伸动作下的动态MRI（dMRI）有助于诊断和手术规划。我们报告了两例颈椎根性病变患者，尽管在标准静态影像检查中没有发现异常症状仍然持续存在。为了更好地观察潜在的病理变化，对这两名患者进行了dMRI序列检查。值得注意的是，在运动过程中观察到了脊髓管宽度的变化。两名患者随后接受了人工椎间盘置换术，并且他们的所有症状均完全消失。虽然对于所有的脊柱疾病患者来说，进行动态MRI并不总是必要的，但对于那些持续存在症状并且静态影像学检查结果不明确的患者来说，它可能具有重要的诊断价值。此外，dMRI还有助于阐明脊柱解剖结构并提高手术规划的精确度。

关键词：动态成像；伸展；屈曲；髓病；根性病变。

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