Overview Compare the Efficacy and Safety of Norspan to Tramadol/Acetaminophen With Prolonged Postoperative Pain (PASSION) Status: Completed Trial end date: 2014-11-01 Target enrollment: Participant gender: Summary The purpose of this study is to compare the efficacy and safety of buprenorphine transdermal system to tramadol/acetaminophen. Phase: Phase 4 Details Lead Sponsor: Mundipharma Korea LtdTreatments: AcetaminophenBuprenorphineTramadol