A 72-year-old man presents with an acutely swollen, painful knee with decreased range of motion and fever of 38.5 °C. There is a large effusion and the joint is exquisitely tender. What is the most appropriate next step in management?AStart oral NSAIDs and review in 1 weekBArthrocentesis for synovial fluid analysis and urgent intravenous antibiotics with orthopaedic consultationCStart allopurinol and colchicineDIntra-articular steroid injection in the EDEPhysiotherapy referral onlyCheck my answer