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Spinal Surgery - L4-5 and L5-S1 Disc Injuries with Laminectomy and Discectomy (Diskectomy). Depicts lumbar spine with disc (disk) bulging at L4-L5 and disc herniations and spinal nerve root compression at L5-S1. The second image pictures the initial incision site for the surgical procedure. The third image illustrates the removal of the L5 lamina. The fourth image shows the herniated disc material being removed during discectomy.