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Lumbar Laminotomy, Discectomy and Fusion Procedure. This surgical exhibit features four posterior views of the low back from L4-S1 as seen through an open incision. Illustrations reveal the following: 1. Laminotomies L4-5 and l5-S1, 2. Discectomy L4-5 and L5-S1, 3. Placement of pedicale screws bilaterally at L4 and S1, 4. Placement of fixation rods and locking hardware for fusion of L4-S1..