Table 2.

Incidence of S. aureus infections

N	All endoprosthetic surgeries	Hip surgeries	Knee surgeries	Spine surgeries
	74,327	29,429	21,285	23,613
Within index hospitalization
N (%)	7 (0.01)	2 (0.01)	1 (0.00)	4 (0.02)
per 1000 py	2.63	1.73	1.42	5.04
Within 30 days
N (%)	93 (0.13)	50 (0.17)	17 (0.08)	26 (0.10)
per 1000 py	15.35	21.01	9.73	13.46
Within 90 days
N (%)	570 (0.77)	296 (1.01)	98 (0.46)	176 (0.66)
per 1000 py	31.76	42.31	18.77	30.71
Within 180 days
N (%)	940 (1.26)	481 (1.63)	169 (0.79)	290 (1.09)
per 1000 py	26.50	35.02	16.25	25.60
Within 365 days
N (%)	1430 (1.92)	687 (2.33)	281 (1.32)	462 (1.74)
per 1000 py	20.20	25.23	13.40	20.43

py Patient years, S aureus, Staphylococcus aureus