3Macnab I.Negative disc exploration.An analysis of the causes of nerve-root involvement in sixty-eight patients[J].J Bone Joint Surg Am,1971,53(5):891-903.
4Kraemer J.Natural course and prognosis of intervertebral disc diseases.International Society for the Study of the Lumbar Spine Seattle,Washington,June 1994[J].Spine,1995,20(6):635-639.
5Cinotti G,Gumina S,Giannicola G,et al.Contralateral recurrent lumbar disc herniation.Results of discectomy compared with those in primary herniation[J].Spine,1999,24(8):800-806.