septic arthritis Flashcards
route of infection
haematogenous
bone abscess eruption
direct invasion
osteomyelitis can become septic arthritis
organisms
staph aureus
haemophilus influenzae
strep pyogenes
E coli
pathology
acute synovitis with purulent joint effusion, articular cartilage attacked by bacterial toxin and cellular enzymes, complete destruction of articular cartilage
outcomes
complete recovery
osteoarthritis
fibrous or bony ankylosis
signs in infants
picture of septicaemia
irritability
resistant to move
ill
signs in child
reluctant to move joint
swelling
not erythema
increased temp and pulse
increase tenderness
signs in adults
superficial joint
rare in healthy adult
may be delayed diagnosis
investigations
FBC, ESR, CRP, blood cultures
Xray
US
MRI
aspiration
most common cause of septic arthritis in adult
infected joint replacement. rare but significant problem
usually staph epidermis/ aureus
