• Mingyan Li, Zihao Liu, and Guixian Dong.
• Department of Orthopaedic Trauma, Harrison International Peace Hospital, Hengshui, Hebei, China.
• Medicine (Baltimore). 2024 Jan 26; 103 (4): e37011e37011.

RationaleMedial malleolus injuries mainly comprise of fractures and deltoid ligament ruptures. Medial malleolus fractures, as a kind of common ankle fractures, could occur separately or be accompanied by lateral and posterior malleolus fractures. It is generally agreed that medial malleolus fracture and deltoid ligament rupture could not occur simultaneously.Patient ConcernsIn our study, we report a case of 36 year-old man diagnosed with trimalleolar fracture accompanying ankle dislocation initially. The patient was admitted to our hospital due to traffic accident.DiagnosisThe patient was diagnosed with trimalleolar fracture accompanying ankle dislocation initially. We missed the diagnosis of accompanied deltoid ligament due to the arthralgia of medial ankle and the widened medial articular space in X-ray after operation.InterventionAs we missed the diagnosis of accompanied deltoid ligament, we only selected open reduction and internal fixation for trimalleolar fracture at first. After we realized the existence of deltoid ligament rupture, the patient refuse further diagnosis and treatment in our hospital.OutcomesDuring the rehabilitation exercise, the patient had medial arthralgia in his right ankle. He complained it and refuse further diagnosis and treatment in our hospital.LessonsThe newfound injury pattern, medial malleolus fracture accompanying deltoid ligament rupture, has not been reported in previous studies. The injury pattern needs further researches to explore the mechanism and it should be taken seriously in clinical practice.Copyright © 2024 the Author(s). Published by Wolters Kluwer Health, Inc.

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