Yi Xiao-dong, Lu Hai-lin, Gong Shu-yi
Department of Orthopaedic, First Hospital of Peking University, Beijing 100034, China.
Zhonghua Wai Ke Za Zhi. 2004 Dec 7;42(23):1427-9.
To evaluate the strength of pedicle screw fixation with bone cement in human cadaveric lumbar vertebral bodies by using biomechanical test.
Twenty-four fresh frozen cadaveric lumbar vertebral bodies were randomly divided into 3 groups, which each group had 8 bodies. The bodies in the first group were drilled only. The bodies in the second group were drilled with tap. The bodies in the third group were drilled and the holes were enlarged by borer. Each vertebral body was drilled in both right and left sides, which one side served as control with the pedicle screws fixation only and another side served as testing side with the pedicle screw fixation with bone cement. The pullout strength was tested on both sides by using borer.
There was significant difference of manifestation of pull-strength between the control side and the testing side in all groups (P < 0.001). For the manifestation of pull-strength of testing side in different groups, which had pedicle screw fixation with bone cement, there was no significant difference between the second group and third group, however, the difference between the first group and the second group and between the first group and third group were significant.
The pedicle screws with bone cements could significantly enhance the strength of fixation in cadaveric lumbar compared with pedicle screws only.
通过生物力学测试评估骨水泥强化椎弓根螺钉固定在人尸体腰椎椎体中的强度。
将24具新鲜冷冻的尸体腰椎椎体随机分为3组，每组8具。第一组椎体仅钻孔；第二组椎体钻孔后攻丝；第三组椎体钻孔后用扩孔钻扩孔。每个椎体的左右两侧均钻孔，一侧仅用椎弓根螺钉固定作为对照，另一侧用骨水泥强化椎弓根螺钉固定作为测试侧。使用扩孔钻对两侧进行拔出强度测试。
所有组的对照侧和测试侧的抗拉强度表现存在显著差异（P < 0.001）。对于不同组中采用骨水泥强化椎弓根螺钉固定的测试侧抗拉强度表现，第二组和第三组之间无显著差异，但第一组与第二组之间以及第一组与第三组之间存在显著差异。
与单纯椎弓根螺钉相比，骨水泥强化椎弓根螺钉可显著提高尸体腰椎的固定强度。
