2[2]Parke WW, Gamme11 K, Rothman RH. Arerial vascula-lization of the cauda equina. J Bone Joint Surg(AM), 1981,63:53
3[3]Teiso L, Merlo A. Autotraction versus passive traction: an open controlled study in lumbar disc herniation. Arch Phys Med Rehabil, 1993, 74:871
4[4]Judovich BD, Nobel GR. Traction therapy, a study of resistance forces. Preliminary report on a new method of lumbar traction.A AmJ Surg, 1957,93:108