6[1]Macnab I . Negative disc exploration:an analysis of nerve root involement in sixty-eight patients[J]. J Bone Joint Surg(Am),1971,53:891-903.
7Bundshuh CV,Stein L,Sluaser JH,et al.Distingushing between scar and recurrent hemiated disc in postoperative patients:value of contrast-enhanced CT and MR imaging[J].AmJ Neuroradiol,1990,949-958.
8Sarrazin JL.Imaging of postoperative lumbar spine[J].J Radiol,2003,84:241-250.
9Sen O,Kizilkilic O,Aydin MV,et al.The role of closed-suction drainage in preventing epidural fibrosis and its correlation with a new grading system of epidural fibrosis on the basis of MRI[J].Eur Spine J,2005,14:409-414.
