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Alterations in Muscle Coordination During Different Gait Phases Following Knee Injury

Authors :

Shaghayegh Hassanzadeh Khanmiri¹ Alireza Hashemi Oskouei² Peyvand Ghaderyan³

1- دانشکده مهندسی پزشکی، دانشگاه صنعتی سهند، تبریز، ایران 2- دانشکده مهندسی پزشکی، دانشگاه صنعتی سهند، تبریز، ایران 3- دانشکده مهندسی پزشکی، دانشگاه صنعتی سهند، تبریز، ایران

Keywords :

Knee injury،Gait Phases،Co-Contraction Index،Integrated EMG Ratio،Neuromuscular Coordination

Abstract :

The purpose of this study is to examine muscle coordination patterns around the knee in individuals with post-knee injury, comparing the injured limb to the contralateral limb, as well as to the dominant limb of healthy controls during different gait phases. Surface electromyography (sEMG) signals have been obtained from a public dataset of knee extensor and flexor muscles during walking and analyzed across four temporal gait phases: preparatory, initial stance, initial-to-midstance, and full gait cycle. Two EMG features, Integrated EMG Ratio (IR) and Co-Contraction Index (CCI), have been extracted to quantify muscle activation patterns. The results have shown significant differences in CCI and IR values in the operated limb compared to the contralateral limb of the injured subjects and the dominant limb of healthy controls during the early stance phases (p<0.05). These findings indicate compensatory neuromuscular changes to improve joint stability after injury, but they may also increase abnormal joint loading and risk of post-traumatic knee osteoarthritis. These findings highlight the need for rehabilitation programs that focus on improving not only muscle strength but also neuromuscular coordination to optimize functional recovery after knee injury.