Purpose] The purpose of this study was to identify the prevalence rate and healing process of lateral malleolus fracture in ankle sprains. [Subjects and Methods] The subjects were 37 patients who were diagnosed as having ankle sprain at our clinic from January 2015 to January 2017. The subjects were divided two groups: the lateral malleolus fracture (fracture) group (14) and the no-fracture group (23). Analysis parameters were the prevalence rate of lateral malleolus fracture, age, gender, rest

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... span, healing span, and presence of sports injuries. [Results] The age, gender, rest period, healing period, and presence of sports injuries of the fracture group were 47.4 ± 22.5 years, 4 males and 10 females, 49.1 ± 30.6 days, 102.7 ± 39.9 days, and 3 cases, respectively. The age of the fracture group was significantly greater than that of the no-fracture group. The sports disorder of the fracture group was significantly low. [Conclusion] Lateral malleolus fractures occurred in approximately 4 out of 10 of the total number of ankle sprains. A rest period of 7 weeks was important for lateral malleolus fracture to heal.