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首页> 外文会议>2014 IEEE Conference on Biomedical Engineering and Sciences >Pull out strength of pedicle screw in normal and osteoporotic cancellous bone models
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Pull out strength of pedicle screw in normal and osteoporotic cancellous bone models

机译：在正常和骨质疏松松质骨模型中拔出椎弓根螺钉的强度

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摘要

Lower back pain is treated by bone fusion between adjacent vertebrae typically using instrumentation to immobilize and stabilize the spine till bony fusion takes place. Instrumentation is effected surgically using pedicle screws. However breakage and loosening of pedicle screws from the vertebral body are two main clinical concerns particularly for osteoporotic patients. The objective of the present study is to evaluate the effect of bone density, insertion depth and insertion angle of pedicle screw on the pull out strength and insertion torque using rigid polyurethane foam constructs. Insertion torque was measured during the insertion of the screw and pull-out tests were performed on instrumented pedicle screws and foam construct. These rigid foams represented the range of extremely osteoporotic to normal bone densities. The insertion angle represented the range of angle of pedicle and the insertion depth represented the depth to which these pedicle screws are inserted in the vertebra. The results showed that the pull out strength and insertion torque increased with increase in density and insertion depth (p<;0.05) whereas pull out strength decreased with increase in insertion angle. There was significant interaction effect of the various factors on the pull out strength and insertion torque. The findings from the current study suggest that holding power of the pedicle screws can be increased by increasing the purchase depth and reducing the angle of insertion. A statistical model was developed to predict the holding power of the screw which can assist surgeon in pre surgical planning.
机译：通过相邻椎骨之间的骨融合治疗下腰痛，通常使用仪器固定并稳定脊柱直到骨融合发生。使用椎弓根螺钉通过外科手术来实现仪器化。然而，椎弓根螺钉的断裂和松动是两个主要的临床问题，特别是对于骨质疏松患者。本研究的目的是评估使用硬质聚氨酯泡沫构造的骨密度，椎弓根螺钉的插入深度和插入角度对拉出强度和插入扭矩的影响。在螺钉插入过程中测量了插入扭矩，并在器械化的椎弓根螺钉和泡沫结构上进行了拉出测试。这些硬质泡沫代表了骨质疏松至正常骨密度的范围。插入角度表示椎弓根角度的范围，插入深度表示这些椎弓根螺钉在椎骨中插入的深度。结果表明，拔出强度和插入扭矩随密度和插入深度的增加而增加（p <; 0.05），而拔出强度随插入角度的增加而减小。各种因素对拔出强度和插入扭矩有明显的相互作用影响。当前研究的结果表明，可以通过增加购买深度和减小插入角度来提高椎弓根螺钉的夹持力。开发了一个统计模型来预测螺钉的夹持力，这可以帮助外科医生进行手术前的计划。

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