Table 1. Annual trends in cervical disc arthroplasty (CDA) vs. revision CDA in the Medicare population from 2005–2014.

Years	Primary CDA	Revision CDA	Revision incidence (%)	Revision burden (%)
2005	72	36	50.00	33.33
2006	134	48	35.82	26.37
2007	138	60	43.47	30.30
2008	195	51	26.15	20.73
2009	202	62	30.69	23.48
2010	228	45	19.73	16.48
2011	220	45	20.45	16.98
2012	191	52	27.22	21.39
2013	254	58	22.83	18.58
2014	387	60	15.50	13.42
Total	2,021	517	25.58	20.37
CAGR	20.54%	5.84%	−12.22	-9.61