| Recruiting | N/A | 90 | Europe | Group tapentadol 50 mg, group A, group tapentadol 75 mg, group B, group tramadol 100 mg, group C | Aretaieion University Hospital | Postoperative Pain, Surgery, Pain, Postoperative, Pain, Acute, Pain, Chronic, Pain, Procedural, Pain, Neuropathic, Analgesia | 12/24 | 12/24 | | |