关键词: 三角韧带损伤, 踝关节骨折, Lauge-Hansen 分型, 诊断与治疗

Abstract: Supination external rotation or Weber type B ankle fracture has both stable and unstable fractures. Unstable fractures always have fibula fractures and fractures of the medial malleolus or deltoid ligament tear at the same time. A consensus has reached that for unstable ankle fractures ，open reduction and internal fixation will achieve better clinical efficacy. There have been many studies on the diagnosis of medial ligament tears，but no consensus has yet been reached on the best method for assessing it. Since the number of patients with deltoid ligament tear due to external rotation is far greater than that we thought，possible information on ligament injury can be provided on the basis of the injury mechanism according to the Lauge-Hansen classification：based on X-ray，use the Lauge-Hansen classification system to evaluate if the deltoid ligament tear has important value，but its sensitivity and specificity remains to be studied. Physical examination，stress radiographs，MRI，arthroscopy，B- ultrasound have been used for a complete assessment of the medial collateral ligament in ankle fractures ，but none of these methods is cheap，simple and reliable. Now clinicians are accustomed to using the gravity stress test to make the assessment，and for suspected patients，it′ s quite worth their while doing arthroscopic exploration. The latest develpoment believes that the operation of open reduction and internal fixation for treating fibula fractures does no good to the repairment of the deltoid ligament tear in lateral malleolus fractures ，and there is no evidence shows that the exposure and repairment of the deltoid ligament has impact on the medial malleolus structure.

Key words: deltoid ligament injury, the Lauge-Hansen classification, ankle fracture, diagnosis and treatment