Comparison of Antagonist Muscle Activity During Walking Between Total Knee Replacement and Control Subjects Using Unnormalized Electromyography

The Journal of Arthroplasty
Hannah J LundbergMarkus A Wimmer

Abstract

Although satisfactory outcomes have been reported after total knee replacement (TKR), full recovery of muscle strength and physical function is rare. We developed a relative activation index (RAI) to compare leg muscle activity from unnormalized surface electromyography (sEMG) between TKR and control subjects. Nineteen TKR and 19 control subjects underwent gait analysis and sEMG. RAIs were calculated by dividing the average sEMG for 2 consecutive subphases of stance defined by the direction of the external sagittal plane moment (flexion or extension). RAIs and external moments indicate TKR subjects have less initial stance antagonist rectus femoris activity (P = .004), greater middle stance antagonist biceps femoris activity (P < .001), and less late stance agonist biceps femoris activity (P < .001) than control subjects. Individuals with TKR demonstrate increased flexor muscle activation during weight bearing, potentially contributing to altered gait patterns found during the stance phase of gait. The RAI helps detail whether decreased external moments correspond to less agonist or more antagonist muscle activity to determine true muscle activity differences between subject groups. Identifying the mechanisms underlying altered...Continue Reading

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Citations

Dec 21, 2016·The Journal of the American Academy of Orthopaedic Surgeons·Paul J RullkoetterChadd W Clary
Dec 21, 2016·The Journal of the American Academy of Orthopaedic Surgeons·Timothy M Wright
Aug 30, 2017·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Du Hyun RoMyung Chul Lee
Feb 3, 2018·Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society·Irene SintiniPaul J Rullkoetter
Jan 25, 2019·The Journal of the American Academy of Orthopaedic Surgeons·Jeffrey B StamboughSimon C Mears
Feb 5, 2021·Journal of Sport and Health Science·Chen WenSongning Zhang
Aug 21, 2021·Knee Surgery, Sports Traumatology, Arthroscopy : Official Journal of the ESSKA·Amy J GarnerJustin P Cobb
Nov 12, 2021·Bone & Joint Research·Amy J GarnerRichard J van Arkel

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