Table 1.

Characteristics of patients with a clinical suspicion of native septic arthritis, early, or late acute PJIs.

Patient characteristics	Native septic arthritis ( $n=\mathrm{12}$ )	Early acute PJI ( $n=\mathrm{14}$ )	Late acute PJI ( $n=\mathrm{19}$ )
Age (mean and standard deviation)	$\mathrm{55}\pm \mathrm{25}$	$\mathrm{67}\pm \mathrm{10}$	$\mathrm{64}\pm \mathrm{15}$
Joint involved (percentage of total)
Knee	66.7	21.4	63.2
Hip	25.0	64.3	36.8
Shoulder	8.3	14.3	–
Collection method (percentage of total)
Arthrocentesis	75.0	28.6	89.5
Surgical	25.0	71.4	10.5