PEEK-OPTIMA® presents DUALYS, a line of PLIF and TLIF cages, which make it possible to perform posterior or transforaminal lumbar interbody fusion. The DUALYS cages are radiotransparent. They are combined with a specific and exclusive instrumentation, wherein the same instrument set can be used for a PLIF or TLIF approach. This instrumentation offers simplicity and ingenuity. The positioning of the trial implant is exactly the same as the final implant. A large product line cages are supplied sterile. It has a streamlined shape that facilitates insertion in the intervertebral space. It is anti-back out teeth which offers optimized bone fusion.