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Objective: To investigate therapeutic effects of multilevel decompression combined with selected fusion in the treatment for multilevel lumbar stenosis.Method: 27 cases of multilevel lumbar stenosis treated with long segmental decompression and selected fusion were reviewed retrospectively.The involved segments were determined by symptoms, clinical features and radiographic documents.We carried out decompression on the stenosed nerve roots and selected fusion on the segments with preoperative instability and probably iatrogenic unstable levels.