. 2012 Feb;3(Suppl 1):59–66. doi: 10.1055/s-0031-1298610

Table 4. Subsequent operations following C-ADR versus fusion from two FDA trials with follow-up of 48 months or more.^*.

	Burkus et al ¹ (2010), 60 mo			Sasso et al ² (2011), 48 mo
	C-ADR (n = 276)	Fusion (n = 265)	P	C-ADR (n = 242)	Fusion (n = 221)	P
Revisions	0% (0)	1.9% (5)	.028	0.4% (1)	0% (0)	NS
Hardware removal	2.5% (7)	4.9% (13)	NS	1.7% (4)	1.8% (4)	NS
Supplemental fixation	0% (0)	1.9% (5)	.028	0% (0)	2.3% (5)	NS
External bone growth stimulator	0% (0)	2.6% (7)	.007	0% (0)	0.9% (2)	NS
Reoperation	1.4% (4)	0.8% (2)	NS	1.7% (4)	0.5% (1)	NS

C-ADR indicates cervical artificial disc replacement; FDA, US Food and Drug Administration; and NS, not statistically significant.

Table 4. Subsequent operations following C-ADR versus fusion from two FDA trials with follow-up of 48 months or more.*.