Table 1.

The distribution of surgical methods in the initial and repeat surgery

Group	Initial surgery	Repeat surgery
AP	ACCF 2	Laminoplasty 7
	ACDF 8	Laminectomy plus fusion with screw fixation 3
PA	Laminoplasty 5
	Laminectomy alone 11	ACCF 12 ACDF 5
	Laminectomy plus fusion with screw fixation 1

group AP: patients were approached anteriorly at the initial surgery and underwent posterior approach at the repeat surgery, group PA: patients were approached posteriorly at the initial surgery and underwent anterior approach at the repeat surgery, ACCF: anterior cervical corpectomy and fusion, ACDF: anterior cervical discectomy and fusion