4Punnett I. rine J L, Keyserling W M, et al. Back disorder and nonneutral trunk postures of automobile assembly workers [J]. Scand J Work Envion Health, 1991,17(5):337-346.
5Brinekmann P, Frobin W, Hierholzer E, et al. Deformation of the vertebral end plate under axial loading of the spine [J]. Spine, 1983,8(8) : 851-856.
6Allan D G, Russell G G, Moreau M J, et al. Vertebral endplate failure in porcine and bovine models of spinal fracture instrumentation [J]. J Orthop Res, 1990,8(1):154-156.
7Patwardhan A G, Havey R M, Ghanayem A J, et al. Loadcarrying capacity of the human cervical spine in compression is increased under a follower load [ J ]. Spine, 2000,25 (12) : 1548.
8Malko J A, Hutton W C, Fajman W A. An in vivo magnetic resonance imaging study of changes in the volume (and fluid content) of the lumbar intervcrbral disc during a simulated diurnal load cycle[J].Spine, 1999,24(10):1015-1022.
9Jennifer L, Gunning J P, Callaghan S M, et al. Spinal posture and prior loading history modulate compressive strength and type of failure in the spine: a biomechanieal study using a porcine cervical spine model [J]. Clin Biomech, 2001,16(4): 471-480.
10Gruber H E, Hanley E N. Analysis of aging and degeneration of the human intervertebral disc. Comparison of surgicalspecimens with normal controls [J]. Spine, 1998,23 (7) : 751.