Table 2.

Number of samples from each group of patients according to the type of prosthesis (hip or knee) and type of infection (acute or chronic)

Group	Number of patients	Number of samples
		SF (acute/chronic)	PT (acute/chronic)	S (acute/chronic)
Hip PJI	33	69 (24/45)	74 (26/48)	67 (20/47)
Hip, control subjects	29	55	60	68
Knee PJI	54	100 (69/31)	126 (88/38)	112 (73/39)
Knee, control subjects	34	62	66	74
Total	150	286	326	321

PJI = prosthetic joint infection; SF = synovial fluid; PT = periprosthetic tissue; S = swab.