The fracture lines associated with posterior malleolar fractures appear to be highly variable. A large fragment extending to the medial malleolus existed in almost 20% of the posterior malleolar fractures in the current study, and some fragments involved almost the entire medial malleolus. Because of the great variation in fracture configurations, preoperative use of computed tomography may be justified. The information obtained from this study will be helpful for conducting basic research of this condition and for determining appropriate surgical approaches.

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Avulsion fracture of the lateral ankle ligaments in cases of severe inversion injury is more common than previously believed. Because of the high incidence and difficulty of detection in children, a high level of suspicion is necessary in order to obtain an accurate diagnosis of avulsion fracture in cases of severe inversion injury and to achieve adequate stability.

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