4[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.
5[3]Fujiwara A, Tamai K, An HS, et al. The relationship between disc degeneration, facet joint osteoarthritis, and stability of the degenerative lumbar spine [J]. J Spinal Disord,2000,13 (5):444-450.
6[4]Soini J, Antti-Poika I, Tallroth K, et al. Disc degeneration and angular movement of the lumbar spine: Comparative study using plain and flexion-extension radiography and discography[J]. J Spinal Disord,1991,4:183-187.
7[5]Murata M, Morio Y, Kuranobu K. Lumbar disc degeneration and segmental instability: A comparison of magnetic resonance images and plain radiographs of patients with low back pain[J].Arch Orthop Trauma Surg, 1994,113:297-301.
8[6]Holmas DC, Brown MD, Eckstein EC, et al. Instability assessment of the lumbar function spinal unit [J]. Orthop Trans,1988,12:619-620.
9[7]Fujiwara A, Lim TH, An HS, et al. The effect of disc degeneration and facet joint osteoarthritis on the segmental flexibility of the lumbar spine[J]. Spine,2000,25(23): 3036-3044.
10[8]Schmidt TA, An HS, Lim TH, et al. The stiffness of lumbar motion segments with a high-intensity zone in the annulus fibrosus[J]. Spine, 1998,23 : 2167-2173.
