JOA score were collected before and after operation, and the curve of cervical were measured.
采集手术前后的JOA评分，并测量颈椎的弧度等数据。
Factors that affect the anterior operative effect of cervical spondylotic myelopathy are disease course, JOA score before operation and age.
前路手术疗效的影响因素依次为：病程、术前joa评分、年龄。
Factors that affect the posterior operative effect of cervical spondylotic myelopathy are JOA score before operation, age and disease course.
后路手术疗效的影响因素依次为：术前JOA评分、年龄、病程。
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