Table S6.

Number of rTKA operations by census region.

Region	2012	2013	2014	2015	2016	2017	2018	2019	All
Northeast	9545 (16.9%)	9710 (16.7%)	10,010 (16.6%)	10,925 (17.5%)	10,725 (17.3%)	10,995 (17.1%)	11,325 (16.6%)	12,190 (16.7%)	85,425 (16.9%)
Midwest	14,985 (26.5%)	15,530 (26.8%)	15,970 (26.4%)	16,095 (25.8%)	16,595 (26.7%)	16,980 (26.5%)	17,825 (26.1%)	18,800 (25.7%)	132,780 (26.3%)
South	20,630 (36.5%)	21,570 (37.2%)	22,425 (37.1%)	23,040 (36.9%)	22,755 (36.7%)	23,600 (36.8%)	26,165 (38.3%)	28,220 (38.5%)	188,405 (37.3%)
West	11,330 (20.1%)	11,175 (19.3%)	12,045 (19.9%)	12,395 (19.8%)	11,975 (19.3%)	12,590 (19.6%)	13,045 (19.1%)	13,995 (19.1%)	98,550 (19.5%)
Total	56,490	57,985	60,450	62,455	62,050	64,165	68,360	73,205	505,160