Abstract
Relationship between Functional Ankle Instability and Landing Pattern. Korean Journal of Sport Biomechanics, Vol. 00, No. 0, pp. 00-00, 2010. Functional ankle instability(FAI) usually appears after ankle sprain. But differences in landing patterns between stable ankle(SA) and FAI have not been determined. The purpose of this study was to compare differences in landing patterns with subject who has FAI and SA during drop landing. Through this study, we came to the conclusion that FAI affects on the movements of lower extremities and ground reaction force during drop landing from following results. First, when compared with SA, FAI group showed decreased maximal knee flexion(MKF) in sagittal plane of ankle, and increased inversion at initial contact(IC) and decreased inversion at MKF in frontal plane of the ankle. Second, FAI group showed decreased flexion at MKF and increased valgus at IC in frontal plane of the knee. Third, subjects with FAI showed increased flexion at IC in sagittal plane, decreased abduction at IC and increased adduction at MKF in hip. FAI group appeared to have higher GRF in all directions except posterior and lateral side of the ankle. Finally, FAI group showed higher medial-lateral excusion in COP. However, FAI group appeared to have lower power absorption in the ankle and the knee. Therefore, it is necessary to develop appropriate treatment paradigms for ankle sprain before FAI develops.
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