The anatomical design of our MectaLIF Intervertebral Body Fusion Device matches the given biological conditions in each patient and pathology and meets the requirements of the treating surgeon. The PLIF procedure, popularized in the 1950s and 1960s by Cloward, who inserted iliac crest bone into the intervertebral disc space, lost popularity because of the complication rate and technical difficulties. In the 1980s spacers made of titanium or carbon fiber reinforced PEEK-OPTIMA[1] were designed to overcome these challenges. The recent development of the Transforaminal Lumbar Interbody Fusion (TLIF) technique, first described by Prof. Harms and Dr. Jeszenszky, offers the benefit of a 360° fusion utilizing a unilateral posterior-only approach.The TLIF technique can therefore be considered as less invasive compared to the PLIF with similar result. Our unique MectaLIF Transforaminal System with its titanium gear interfacing with the inserter at variable angles from 0-60° enables the surgeon to alter the angle of the cage in situ in 15° increments and to reposition during surgery without switching instrumentation. This feature is very beneficial for both open and MIS-surgery and ensures constant control during implant positioning without the need to disengage the inserter instrument, in order to optimize implant positioning in both the coronal and sagittal planes.