4Coventry M B, Ghormley R K, Kernohan J W, et al. The intervertebral disc: its microseopie anatomy and pathology, II, changes in the intervertebral disc concomitant with age [J]. The Journal of Bone and Joint Surgery, 1945(2) :233-247.
5Osti O L, Vemon Roberts B, Fraster R D, et al. Volvo A- ward in experimental studys Anulus tears and intervertebral disc degeneration: an experimental study using an animal model[J]. Spine, 1990, 15(8):762-767.
5[1]Moore M J, Banie VR,Robert DF,et al. The origin and fate of herniated lumbar intervertebral disc tissue[ J]. Spine, 1996,21: 2149-2155
6[2]Thompson JP,Pearce RH,Schechter MT,et al. Preliminary evaluation of a scheme for grading the gross morphology of the human intervertebral disc[J]. Spine, 1990, 15: 411 -415
7[3]Hansen HJ. A pathologic-anatomical interpretation of disc degeneration in dogs[ J]. Acta Orthop Scand,8: 91 - 95
8[4]Lowell A, Canh N, Shiwei Yu, et al. Canine intervertebral disks:correlation of anatomy and MR imaging [ J ]. Radiology, 1990,175:207-211
9[6]Scott JE,Bosworth TR,Cribb AM,et al. The chemical morphology of aggravited changes in human intervertebral discs glycosaminoglycans from cervical thoracic and lumbar nucleus palposus and anulus fibrosus[ J]. JAnat, 1994, 184: 73 - 82
10[7]Kuiper J, Verbeek J, Frings-DresenM, et al. Keratan sulfate as a potential biomarker of loading of the intervertebral disc [ J ]. Spine,1998, 23:657-663