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Lower Back Injury - L4-5, L5-S1 Decompression Surgery. This medical exhibit pictures a view through the back revealing pre-operative disc herniations and osteophytes at L4-5 and L5-S1. Additional posterior surgical images reflect the following: 1. Incision into the low back, 2. Discectomy and disc removal, and 3. Decompression of nerve roots and resection of bony overgrowth.