Table 2. Classification of periprosthetic infections (modified according to [19]).

	Time since surgery
	0 to 2 months	3 to 24 months	Any time
Type of infection	Early infection	Delayed (low-grade) infection	Late infection
Route of infection	Perioperative	Perioperative	Hematogenous (focus usually on lungs, skin, urinary tract, dental) or continuous spreading from elsewhere
Clinical symptoms	Local reddening, overheating, fever, pain, wound dehiscence, secretion	Persistent or new-onset pain, loosening, fistula formation	Acute or subacute
Most common pathogens	Staphylococcus aureus, streptococci, enterococci	Coagulase-negative staphylococci, Propionibacterium acnes	Staphylococcus aureus, Escherichia coli, streptococci