A prospective, double-blind, randomized controlled trial of treatment of atlantoaxial instability with C1 posterior arches >4 mm by comparing C1 pedicle with lateral mass screws fixation

Table 2 Comparison of intraoperative indexes between two groups

	Operation time	Estimated blood loss	Venous plexus injury	Nerve root injury
Group A	85 ± 11	180 ± 40	0	0
Group B	110 ± 17	370 ± 80	13	9
P value	<0.01	<0.01	<0.01	<0.01

ISSN: 1471-2474