ACUTE painful erythematous joint

Question 1

DD of acute painful , erythematous, atraumatic knee joint

Answer 1

septic arthritis
reactive arthritis
acute gout

Question 2

joint aspirate done , list the criteria for normal , non inflammatory , inflammatory, septic specimen

Answer 2

normal : clear , wwc <200 , neut < 10%
non inflammatory : straw, wcc <2000, neuto <20 %
Inflammatory : cloudy , WCC 2000-50 000 , neut 20-50%
Septic : turbid , WCC >50 000 , neuto >75%

Question 3

If joint aspirate suggest septic arthritis , what AB will give while waiting culture result ?

Answer 3

Flucloxacillin 2 g QID IV