Table 1.

Summary of clinical characteristics for RS3PR and PJI.

	RS3PE	PJI
Symptoms
Fever	Rare	+
Joint synovitis	+	+
Swelling	+	+
Redness	±	+
Pain	+	+
Edema of extremity	+	Rare
Bilaterality of symptoms	+	Rare
Laboratory data
Increased WBC	±	+
Elevated CRP	+	+
Raised ESR	+	+
Increased procalcitonin	‐	±
Joint fluid culture	‐	+
Blood culture	‐	±

CRP = C-reactive protein, ESR = erythrocyte sedimentation rate, PJI = periprosthetic joint infection, RS3PE = remitting seronegative symmetrical synovitis with pitting edema, WBC = white blood cell.