The aim of this study is to determine the effect of continuation of buprenorphine/naloxone in patients with history of Opioid Use Disorder (OUD) scheduled for upper and lower extremity, thoracic and abdominal surgery compared to discontinuation of buprenorphine/naloxone 3 days prior to surgery on pain scores, opioid consumption, patient satisfaction, and severity of substance use dependence- including record of problematic use of any non-prescribed opioids, alcohol and illicit narcotics.