Rheumatology Main71-80,Q 1,A 31-year-old Caucasian male complains of joint pains. He describes right knee pain, right heel pain and low-back pain. He was recently treated for urethral discharge at an outside clinic. He has no history of trauma or illicit drug use. He is afebrile, and his vital signs are stable. His right knee is swollen, tender and warm to touch; tenderness is also present over the Achilles tendon. Oral examination shows mouth ulcers. Synovial fluid analysis from the right knee
