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Spine Surgery - L4-5 Anterior Discectomy and Spinal Fusion Procedures.  Depicts the abdomen being incised and retracted, exposing the lumbar vertebrae and the L4-5 disc. The third illustration displays the anterior discectomy (diskectomy) surgical procedure. The fourth picture reveals the anterior iliac crest bone harvest. The fifth image illustrates a superior view of the L5 vertebra with the bone graft fusion cages in place.