5Sussman BJ. Inadegnacies and hazards of chymopapain injections as treatment for intervertebral disc disease[J].J neurosurg, 1975,42:398.
6Onik G,Helus CA. Automated percutaneous diskectomy[J].AJK, 1991,156:531.
7Delmnarter RB, Howard MW,Goldste in,et al. Percutaneous lumbar discectomy. Pro and post-operative magnetic resonance imaging[J].J Bone Surg(AM),1995,77:578.
8FernstromU. Arthroplasty with intercorporal endoprothesis in gerniated disc and in painful disc[J].Acta Chir Scand, 1996,357(suppl):154.
