Difference in bilateral lower limb muscle synergy mode for gait in patients after unilateral anterior cruciate liga-ment reconstruction
Objective To investigate the difference in bilateral lower limb muscle synergy mode during gait in patients after unilater-al anterior cruciate ligament reconstruction.Methods Electromyography from bilateral lower limb muscles during gait were collected from twelve male and eight fe-male patients after unilateral anterior cruciate ligament reconstruction in Affiliated Hospital of Wuhan Sports Uni-versity,from April to June,2023.The data were analyzed using non-negative matrix decomposition algorithm to extract the number of muscle synergies in the affected and unaffected legs,the time to peak activation of muscle synergies and the relative weights of the muscles.Results Six types of muscle synergy were identified in the unaffected leg of males during gait,while five types were identified in the affected leg,lacking synergy 2 that mainly from the tibialis anterior muscle.Six types of muscle synergy were identified in both legs in females during gait.There was no significant difference in the time to peak activation of muscle synergies between both legs in males(P>0.05).However,the time to peak activation of muscle synergies increased in females in the affected leg for synergy 3 and synergy 5(P<0.05).The relative weight of the rectus femoris was lower in synergy 1 in the affected leg in males(P<0.05).For female,the rela-tive weight of the vastus lateralis was higher and the relative weight of the biceps femoris was lower in synergy 2 in the affected leg in females(P<0.05);while the relative weight of the rectus femoris was lower in synergy 3(P<0.05),and the relative weight of the biceps femoris was lower in synergy 6(P<0.05).Conclusion Males would freeze the muscle synergy dominating ankle dorsiflexion in affected leg to enhance ankle sta-bility,and reduce the relative weight of rectus femoris during the loading response phase to weaken the knee land-ing cushioning.However,females would delay the activation of synergies dominating in loading response phase and the mid-stance phase,enhance the relative weight of vastus lateralis during the loading response phase,and reduce the relative weights of rectus femoris in the loading response phase and the relative weight of biceps femo-ris in the mid-stance phase,to limit knee flexion.
anterior cruciate ligament reconstructiongaitmuscle synergymotor control
万方数据
维普
