Kinematics and muscle activities of the lower limb during a side-cutting task in subjects with chronic ankle instability

Abstract

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

Altered movement strategies during jump landing/cutting in patients with chronic ankle instability

“…A recent study suggested that CAI patients increased activation of plantarflexors to stiffen the ankle joint . Similarly, our results suggested CAI patients attempted to increase ankle joint stability and attenuate ankle load immediately after ground contact by increasing MG EMG activation …”

“…However, most studies have examined movement patterns (eg, kinematics, kinetics, and muscle activation) with simple, easy, and/or uniplanar landing tasks such as a drop landing rather than functional activities such as single‐leg landing including sudden deceleration, rapid changing direction, and acceleration. Furthermore, recent studies revealed that CAI affected not only the ankle but also the knee and hip joint biomechanics and neuromuscular patterns . These results provide evidence that mechanisms of CAI may be multifactorial.…”

“…Furthermore, recent studies revealed that CAI affected not only the ankle but also the knee and hip joint biomechanics and neuromuscular patterns. 8,9 These results provide evidence that mechanisms of CAI may be multifactorial.…”

“…Sport-related movements require more demanding, challenging, and complex joint control for the lower extremity than activities of daily living such as walking. 8 CAI patients demonstrated more significant kinematic changes during movements including sudden deceleration and changing direction than walk, run, drop jump, and stop jump. 9 However, most studies have examined movement patterns (eg, kinematics, kinetics, and muscle activation) with simple, easy, and/or uniplanar landing tasks such as a drop landing 10 rather than functional activities such as single-leg landing including sudden deceleration, rapid changing direction, and acceleration.…”

“…In order to bridge the gap between sensorimotor impairments and the mechanisms of CAI, it is imperative to comprehensively evaluate biomechanical and neuromuscular patterns during a sport maneuver. Sport‐related movements require more demanding, challenging, and complex joint control for the lower extremity than activities of daily living such as walking . CAI patients demonstrated more significant kinematic changes during movements including sudden deceleration and changing direction than walk, run, drop jump, and stop jump .…”