Oblique Lumbar Interbody Fusion (OLIF) surgery is a surgical method used in the treatment of common spinal disorders in adults, such as spinal canal stenosis due to calcification of the spine, nerve compression, and spondylolisthesis. In such cases, fusion surgeries, where vertebrae are stabilized by connecting them with screws or implants, are preferred. Most traditional fusion surgeries are performed from the patient's lower back (posterior approach). These operations generally fall into two main categories: stabilization with screws only (Posterior Stabilization or PLF) and placement of cages between the vertebrae from the posterior side along with screw fixation (TLIF/PLIF). In patients with spinal cord compression, decompression is also performed with the aid of a microscope during these procedures. OLIF surgery, however, is a fusion technique where large cages are placed between the problematic vertebrae through small incisions. In this method, screw fixation is applied as in other fusion surgeries. However, the difference is that the wide cages placed between the vertebrae are inserted through the patient's abdominal cavity, meaning from the anterior side of the body. The anterior placement of wide cages in OLIF surgery offers significant advantages over classic surgical methods (TLIF/PLIF/PLF). While cages can also be placed between vertebrae in TLIF/PLIF surgeries, these operations are performed from the posterior side, meaning the cages that can be inserted are not as wide as those in OLIF surgery.