Fig. 2From: A randomized controlled trial on the effects of collagen sponge and topical tranexamic acid in posterior spinal fusion surgeriesPostoperative drainage in 3 groups. The postoperative drainage in experimental groups is much less than control group in POD 1 as well as total volume, and TXA group shows the best effect. There was no significant difference in 3 groups in POD 2Back to article page