先天性颈椎管狭窄与脊髓型颈椎病影像学表现以及预后的关系

The relationship between the imaging features and prognosis in the patients with cervical spinal stenosis and cervical spondylotic myelopathy

目的 探讨脊髓型颈椎病（cervical spondylotic myelopathy,CSM）患者先天性颈椎管狭窄（cervical spinal stenosis,CSS）与颈椎MRI改变及预后的关系.方法 回顾性分析自2006年11月至2009年11月,采用前路、后路或前后路联合手术治疗的286例CSM患者的病例资料,根据患者是否存在CSS将患者分为两组,在MRI T2加权像上评价脊髓高信号的等级以及脊髓受压程度.记录患者日本骨科学会评分标准（Japanese Orthopaedic Associatio,JOA）评分、病程和体征,包括感觉减退或者消失、Hoffman征、Babinski征、腱反射.结果 在CSM患者中CSS的发生率为33.6%,先天性CSS组的年龄、JOA评分、病程均大于无CSS组,术后临床改善率小于无CSS组.两组之间性别的差异无统计学意义（x2=0.006,P=1.00）,两组之间的颈椎MRI T2加权像脊髓高信号发生率的差异有统计学意义（x2=-62.396,P＜0.001）,CSS组脊髓高信号的发生率为70.8%,无CSS组脊髓高信号的发生率为22.6%.先天性CSS组脊髓受压程度相对于无CSS组严重,且先天性CSS组患者体征的数目相对较多.应用多元线性回归分析法得出术后改善率与CSS、病程、临床体征的数目和年龄有关（R2=0.565）.结论 先天性CSS患者出现CSM时往往脊髓受压程度较重、MRI T2加权像脊髓内高信号出现的概率大,病程长且预后较差.

Objective To investigate the relationship between the cervical MR images and pathological changes, prognosis in patients with cervical spinal stenosis and cervical spondylotic myelopathy. Methods From Nov. 2006 to Nov. 2009, 286 patients with cervical spondylotic myelopathy were included through retrospective analysis. All patients were divided into two groups according to whether there was cervical stenosis, the grade of increased signal intensity （ISI） in spinal cord and the degree of spinal cord compression was evaluate in T2-weighted MR images of midian sagittal slices. JOA scale, duration of disease,Hoffmann sign, Babinski sign, sensory loss or hypoesthesia, and lower-extremity/upper-extremity hyperreflexia were recorded. Results The incidence rate of cervical spinal stenosis was 33.6% in patients with cervical spondylotic myelopathy. The study showed that the age was smaller （P〈 0.001 ）, preoperative JOA score was higher（P=0.0018）, duration of disease was longer（P=0.009）, and the recovery rate was lower（P〈 0.001 ）in cervical spinal canal narrowing group comparing with control group. There was no significant difference between the two groups in gender （x2=0.006,P=l.00）. There was significant difference between two groups in the incidence of ISI in spinal cord through x2 test（x2=62.396,P〈 0.001 ）. Multivariate analysis indicated that the likelihood of the recovery rate of cervical myelopathy decreased with the presence of cervical spinal stenosis, duration of dieaase, number of neurological signs, age （R2=0.565）. Conclusion Patients with congenitally narrow cervical spinal canal have to suffer severe spinal cord compression and high incidence of ISI in spinal cord. The duration of disease is long, and prognosis is poor.