Question

A 35-year-old man presents with worsening knee pain and morning stiffness for 2 hours. Examination shows a warm, swollen knee with effusion and limited movement. He is febrile at 38.5 °C. What is the most appropriate immediate investigation?

Accepted Answer

Arthrocentesis of the knee for synovial fluid analysis and culture

Answer

Plain radiograph of the knee only

Answer

Serum uric acid level

Answer

MRI of the knee

Answer

No investigations; start NSAIDs and review

Practice question

A 35-year-old man presents with worsening knee pain and morning stiffness for 2 hours. Examination shows a warm, swollen knee with effusion and limited movement. He is febrile at 38.5 °C. What is the most appropriate immediate investigation?