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Lumbar Spine Injury - L5-S1 Disc Herniation with Posterior Spinal Fusion Surgery. This medical illustration series reveals a central disc herniation at the L5-S1 level followed by surgical steps of the following: 1. Posterior incision, 2. Decompression laminectomy and discectomy, and 3. Placement of fusion cages packed with bone graft between L5 and S1.