3[2]White AA,Panjabi MM.Clinical biomechanics of the spine[M].2nd ed.Philadephia:lippincott,1990.635-696
4[5]Vitaz T W,Raque GH.Shields C B,et al.Surgical treatmentof lumbar spine stenosis in patients older than 75 years of age[J].Neurosurg,1999,91 (2):181