Methods. The study population consisted of 3 patient groups evaluated by MRI 2 to 5 days after lumbar decompression with or without fusion.
方法：研究人群包括腰椎减压伴或不伴融合术后2到5天接受MRI评估的3个病例组。
Results were grouped by patient population or setting.
结果根据不同人群和研究地点分组。
Results were grouped by patient population or setting.
结果根据不同人群和研究地点分组。
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