screw thread failure 螺纹失效
The correct countermeasures are taken to prevent the drill collar screw failure effectively, ensuring the qualitative reliability of drill collar screw.
通过采用合适的对策，有效预防钻铤螺纹失效，从而保证钻铤螺纹的质量可靠性。
Methods 8 cases of failure thoracolumbar fractures treated with pedicle screw fixation were analyzed retrospectively.
方法对8例胸腰椎骨折椎弓根螺钉内固定失败病例进行回顾性分析。
The reasons of internal fixation failure were nonanatomically reduction of fractures, unrigid interal fixation, over early weight bearing and poor placement of lag screw.
内固定失败原因是术中骨折未解剖复位、内固定不坚强、过早完全负重以及拉力螺钉位置不良。
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