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. 2018 Feb 13;19:51. doi: 10.1186/s12891-018-1974-1

Fig. 3.

Fig. 3

a The occurrence of posteriormalleolar fractures in the supination-external rotation stage IV injury is mainly caused by the rotational force. b The posterior malleolar fracture in the pronation-external rotationstage IV injury may have occurreddue to a combination of rotational and axial forces