6. 一位55歲的女性三年來有右膝關節慢性腫痛,其間有時會有急性疼痛發生。經服用消炎片會減輕,但是慢性腫痛仍持續發生。經抽取關節液檢查發現為brown-tingled hemorrhagic fluid,關節X光檢查發現soft tissue density mass in the joint space。患者的血中尿酸值為7.2 mg/dl。而且無凝血障礙。請問下列的治療何者最為恰當?
(A) Total synovectomy
(B) Oral uricosuric agent
(C) use of NSAIDs
(D) low dose prednisolone ( 10 mg QD)
(E) repeated joint irrigation