英语语法分析

Methods 13 cases of refracture of the bone after operation were followed up and analyzed.

方法对13例四肢骨折术后内固定断裂治疗结果进行随访分析。

At 12-15 months after surgery, patella holder was taken out and no lost of reduction or refracture occurred.

术后12 ~ 15个月取出聚髌器，均未发生骨折复位丢失或再骨折。

Conclusion: the main reason of refracture through the last screw hole in plate fixation is over-stress concentration.

结论钢板边缘末位螺丝钉孔处再骨折的发生，主要与钢板两端应力集中有关。