A Rare Case of Burkholderia cepacia Complex Septic Arthritis.

Bacteria of the Burkholderia cepacia complex have rarely been reported to cause septic arthritis. Cases have been reported in patients who were immunocompromised, at extremes of age or who had history of steroid injection or penetrating trauma. A 67-year-old man with a history of opioid use disorder, osteoarthritis, and gout but no known immunocompromise was admitted to hospital with pain and swelling of his right knee. Cultures of synovial fluid and urine grew Burkholderia cepacia complex. Microscopy of synovial fluid also identified intracellular calcium pyrophosphate crystals. The patient's symptoms improved with joint irrigation and debridement and prolonged antimicrobial therapy. This case highlights the importance of diagnostic aspiration of an acutely inflamed joint to obtain a specific etiological diagnosis.