The study design was approved by the locale ethics committee. This double-blinded, randomized, controlled clinical trial recruited 50 patients aged between 18 and 65 years with the American society of anesthesiologists (ASA) physical status classification systems I/II who were candidated for surgical operations on lumbar disc hernia surgery. All the participants will be asked to sign an informed consent form after having been provided with details of the aim and proceedings of the study. Patients will excluded from the study if they have a neurological and neuromuscular disorders, psychiatric problems, cardiopulmoner diseases, coagulopathy, infections or allergy to local anesthetic agents. Patients will be divided into two groups as Group T (TLIP block) and Group E (Epidural group).