You are consulted regarding a 62-year-old man who began having acute pain in his right knee one day after undergoing craniotomy for glioblastoma multiforme resection. The patient has a history of gout, usually affecting his right great toe, for which he has been taking allopurinol. Aspiration of the right knee joint yields synovial fluid with a leukocyte count of 5000/uL. Gram stain of the synovial fluid shows negatively birefringent crystals and no bacteria. Which of the following is the best treatment for this patient's joint pain?
A) Oral indomethacin
B) Intramuscular ketorolac
C) Intraarticular triamcinolone
D) Intravenous acetaminophen