A single center, retrospective review of patients undergoing knee joint fluid aspirations for presumed crystalline arthritis (CA) showed that synovial WBC may provide a useful diagnostic marker for SA with an optimal threshold of 50,000 cells/mm3.
Distinguishing septic arthritis (SA) from crystalline arthritis (CA) or the coexistance of both can be diagnostically and clinically challenging. This study sought to identify the prevalence of and define diagnostic laboratory markers for SA in the setting of CA.