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A : A plain radiograph taken 31 months after repeated open lumbar microdiscectomy for recurrent disc herniation at L4-5 level showing decrease of disc height at L4-5 level (left : preoperation, right : postoperation). B : A plain radiograph taken 34 months after percutaneous endoscopic lumbar discectomy for recurrent disc herniation at L4-5 level showing preserved disc height at L4-5 level (left : preoperation, right : postoperation).
