1Purpose: The purpose of the present study was to evaluate lower limb kinematics and 2 muscular activities during walking, side-turning while walking, and side-cutting movement in 3 athletes with chronic ankle instability and compare the results to those of athletes without 4 chronic ankle instability. 5Methods: Lower limb kinematics and muscular activities were evaluated in 10 athletes with 6 chronic ankle instability and 10 healthy control athletes using a three-dimensional motion 7 analysis system and surface electromyography during the 200-ms pre-initial contact (IC) and 8 stance phases while walking, side-turning while walking, and side-cutting. Results: During walking or side-turning while walking, there were no significant differences 10 in kinematics or muscle activities between the subjects with and without chronic ankle

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(natural, toe-in, toe-out). The knee kinetics and kinematics during landing were evaluated 5 using a motion analysis system. Results under three toe conditions were compared using 6 a one-way repeated-measures analysis of variance and a post-hoc Bonferroni test. Results: Toe-in landing was associated with a significantly greater knee abduction angle, 8 tibial internal rotation angle, and knee abduction moment than the natural and toe-out 9 conditions. Toe-out landing was associated with significantly greater tibial internal 10 rotational angular velocity.