What is septic infectious arthritis?

Articular manifestations due to presence of pathogen within a joint, major cases bacteria, most common is S.areus, could be virus/fungi/mycobacterium. Hematogenous seeding of vascular synovial membrane after bacteremia, may also arise from penetrating cutaneous trauma following plant-thorn wound/animal bite. Rarely due to corticosteroid joint injection or intraarticular procedures, typical is acute, very painful monoarthritis with fever. Irreversible loss of function develops in 25-50% of pt related to delayed dx and tx, can be life threat in 10% of cases