Lumbar Spine Surgery Posterior Interbody Vertebral Fusion with cage orthopaedic surgery videos. Illustrates the surgical technique for performing a posterior lumbar interbody fusion. Orthopaedic surgery videos are used to remove an intervertebral disc causing uncontrollable pain or compressing adjacent spinal cord or nerve roots. A metal cage filled with bone chips is used to replace the removed disc and maintain correct alignment. Pedicle screw instrumentation is used to ensure stability while fusion occurs. There are many different techniques to achieve the same end result, a pain-free, stable, anatomically positioned bony fusion. However, the basic procedure illustrated here is common to all posterior lumbar interbody fusions. Also shown is the patient position, skin preparation and incision, the surgical approach, the removal of the pathological intervertebral disc, instrumentation. Lumbar Spine Surgery Posterior Interbody Vertebral Fusion with cage orthopaedic surgery videos.