Kanchiku T, Taguchi T, Kaneko K, Fuchigami Y, Yonemura H, Kawai S
Department of Orthopedic Surgery, Yamaguchi University School of Medicine, Ube, Japan.
Spine (Phila Pa 1976). 2001 Jul 1;26(13):E294-9. doi: 10.1097/00007632-200107010-00014.
Correlation between compressed spinal cords on magnetic resonance imaging (MRI) and electrophysiological findings in cervical spondylotic myelopathy patients.
To clarify the correlation between spinal-cord-evoked potentials and MRI measurements of compressed spinal cords in patients with cervical spondylotic myelopathy.
Compression of the spinal cord does not always cause clinical symptoms and it is difficult to infer the degree of dysfunction of the spinal cord from MRI findings.
Seventeen patients with cervical spondylotic myelopathy were examined with MRI and spinal-cord-evoked potentials before surgery. Using abnormality in spinal-cord-evoked potentials as indicators of spinal cord morphology, spinal-cord transverse area and compression ratios (central and 1/4-lateral) were measured on T1-weighted axial imaging. The correlations between these dimensions and electrophysiological findings were investigated.
The mean preoperative transverse area of the spinal cord was 47.13 mm2. The mean preoperative central compression ratio of the spinal cord was 34.4%. The mean preoperative 1/4-lateral compression ratio of the spinal cord was 27.5%. A correlation (Spearman r=0.65, P < 0.01) was observed between the 1/4-lateral compression ratio of the spinal cord and the amplitude ratio of spinal-cord-evoked potentials after electric stimulation of the brain (Br(E)-SCEPs).
The preoperative 1/4-lateral compression ratio of the spinal cord was found to reflect the degree of dysfunction of the corticospinal tracts.
颈椎病性脊髓病患者磁共振成像（MRI）上脊髓受压与电生理结果的相关性。
阐明颈椎病性脊髓病患者脊髓诱发电位与脊髓受压MRI测量值之间的相关性。
脊髓受压并不总是导致临床症状，且难以从MRI结果推断脊髓功能障碍的程度。
对17例颈椎病性脊髓病患者在手术前进行MRI和脊髓诱发电位检查。以脊髓诱发电位异常作为脊髓形态学指标，在T1加权轴位成像上测量脊髓横截面积和压迫率（中央及1/4侧方）。研究这些维度与电生理结果之间的相关性。
术前脊髓平均横截面积为47.13平方毫米。术前脊髓平均中央压迫率为34.4%。术前脊髓平均1/4侧方压迫率为27.5%。在脑电刺激后脊髓诱发电位的波幅比（Br(E)-SCEPs）与脊髓1/4侧方压迫率之间观察到相关性（Spearman r = 0.65，P < 0.01）。
发现术前脊髓1/4侧方压迫率可反映皮质脊髓束的功能障碍程度。
