Tower-door type fracture of the ankle joint is a rare and intra-articular fracture which is difficult to be treated.

踝关节塔门型骨折是一种少见且治疗困难的关节内骨折。

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The result shows that the fracture mode is low stress brittle fracture. The fracture is mainly caused by needle type martensite in the heat affected zone of the weld joint.

结果表明，在连接杆焊缝附近的热影响区中存在大量针状马氏体组织，在低应力的作用下，导致材料发生脆性断裂。

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