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The mean CSA of the thecal sac increased from 64.18 mm preoperatively to 95.72 mm postoperatively. The mean distance of FJ gap increased from 0.8 (0-1.5) mm preoperatively to 3.1 (0.5-6. mm postoperatively. LLIF may be indicated for intraspinal facet cysts with segmental instability. LLIF may be indicated for intraspinal facet cysts with segmental instability. Pyogenic spondylitis of the lumbar spine markedly decreases the ability to perform activities of daily living and causes severe low back pain. The challenge is to improve low back