Intervertebral-spreader-assisted anterior cervical discectomy and fusion prevents postoperative axial pain by alleviating facet joint pressure

Table 2 Correlation between clinical parameters and postoperative neck VAS score

	3 days-Postop	1 months-Postop	2 months-Postop	6 months-Postop
△IDH	0.081	0.295	0.438	0.659
△IFD	0.128	0.307	0.585	0.658
JOA	0.231	0.258	0.536	0.842
NDI	0.031	0.052	0.127	0.425
aVAS	0.103	0.231	0.354	0.558

△IDH postoperative change of intervertebral disc height, △IFD postoperative change of interfacet distance, JOA Japanese Orthopedic Association for cervical myelopathy, nVAS neck Visual Analog Scale, aVAS arm pain Visual Analog Scale, NDI Neck Disability Index. A P value of less than 0.05 was considered to indicate a statistically significant difference

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