7Meyerding HW. Spondylolisthesis as etiologic factor in backache[J]. J A M A,1988,111:1971.
8Weinstein JN, Spratt KF, Spengler D, et al. Spinal pedicle fixation:reliability and validity of roentgenogram-based assessment and surgical factors on successful screw placement[J].Spine, 1988, 13:1012-1018.
9Steven M, Theiss. Isthmls Spondylolishcsis and Spondylolysis. J South Orthop Assoc2001:10(3) :164-172.