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Back Surgery - L5-S1 Disc Herniation with Hemilaminectomy and Discectomy (Diskectomy). Shows a herniated intervertebral disc at L5-S1 compressing the spinal nerve root. Surgical steps: 1. Incision into the lower back from the spinous process of L4 to S1; 2. The removal of the inferior lamina of L5 and S1 on the left hand side (hemilaminectomy); 3. Discectomy (removal of the herniated disc) and decompression of the left nerve root.