A 62-year-old man with rheumatoid arthritis and a prosthetic knee joint presents with an acutely swollen, hot and very painful knee. He is febrile at 38.5°C. What is the most appropriate immediate management?AStart oral NSAIDs and arrange routine orthopaedic reviewBUrgent joint aspiration, send synovial fluid for microscopy and culture, and start empirical intravenous antibioticsCStart disease-modifying antirheumatic drugs (DMARDs) immediatelyDGive intra-articular steroid injection in primary careEAdvise rest and ice packs with review in 1 weekCheck my answer