Abstract
Background and objective Ankle injuries are prevalent among elementary school students and are associated with subsequent injuries. This study aimed to investigate the relationship between a history of ankle sprain and the physical characteristics of elementary school badminton players. Methods A questionnaire-based survey was conducted among 64 fifth- and sixth-grade badminton players. Based on the presence or absence of a history of ankle sprain, the participants were categorized into the sprain and non-sprain groups. Both groups underwent assessments of dynamic balance ability, flexibility, muscle strength, and foot evaluation. Players whose sprained sides matched their dominant foot were included in the analysis. Results A total of 15 players were assigned to the sprain group and 49 to the non-sprain group. In the sprain group, 11 players had their sprained side matched to their dominant foot. The sprain group showed a significantly higher proportion of patients who were unable to squat, a significantly stronger knee extension strength, and a significantly lower ankle dorsiflexion range of motion. Conclusions A history of ankle sprain in elementary school badminton players is associated with ankle flexibility and knee extension strength. In badminton, repetitive lunging and jumping movements pose a high risk of ankle sprain, which is the most common type of lower limb injury. Limited ankle dorsiflexion range of motion (ROM) has been identified as a characteristic feature of the sprain group, suggesting that it is a critical factor requiring particular attention after an ankle sprain.