Nonlinear Analysis of Human Ankle Dynamics

In this paper finite-time Lyapunov exponents were estimated in order to quantify the local dynamic stability, based on the experimental time series of the flexion-extension and inversion-eversion angles of ankle joints, obtained from a group of five subjects with normal left ankles and right ankles suffering by repeated sprains with residual laxities walking over-ground and on plane and inclined treadmill with different speeds and inclinations.