Efficiency of Thoracolumbar Interfascial Plane Block in Lumbar Disk Surgery Lomber disc hernia is one of the most common diseases in Turkey. The prevalence in various studies is between 60-80% and incidence is between 1-3% for the entire population, If adequate analgesia isn't achieved in postoperative period, the patients can faced with postoperative pain due to lomber disc hernia. In fact, as a result of inadequate analgesia chronic pain can be develop, and patients can be suffered by this pain for long years Thoracolumbar interfascial blok, was defined by Hand et al, descibed for reduce pain of thoracolumbar region surgery. After afferent fibers separate from medulla spinalis, they're called r.anterior and r.posterior. While r. anterior spreads to anterior abdominal wall, r.posterior spreads to thoracolumbar region. Goal of TLIP is to provide a same impact in the thoracolumbar region, like thoracoabdominal plane block (TAP) diminish the pain in the abdominal surgery.