Clinical results and surgery tactics of spinal osteotomy for ankylosing spondylitis kyphosis: experience of 428 patients

Table 2 Frequency of complications in two groups

Complication	Frequency		χ ²	p
Complication	One-level group (n = 339)	Two-level group (n = 89)	χ ²	p
CSF leaks	12	9	5.19	0.023
Neurologic deficit	0	3	–	0.009^a
Vascular laceration bleeding	0	1	–	0.208^a
Surgical site infection	1	1	–	0.373^a
Low back pain	3	2	0.26	0.610
Rod broken	1	2	–	0.111^a
Pedicle screws loosening	2	2		0.192^a
Pseudarthrosis	3	1		0.608^a

ISSN: 1749-799X