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Purpose: The aim of the study was to compare the analgesic effect of 5 mg intra-articular (IA) morphine with 50 mg IA tramadol. Type of Study: Prospective double-blind randomized trial. Methods: Seventy-five patients having elective arthroscopic surgery of the knee were randomized to receive IA tramadol 50 mg (tramadol group), IA morphine 5 mg (morphine group), or IA normal saline (control group),...