Descriptive Study of Strength Training Exercises to Activate the Muscles of the Operated Leg After Total Knee Replacement

Study Overview
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Brief Summary
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Background: In the early phase after a total knee replacement (TKA), patients experience multi-level weakness in the operated leg, which is caused primarily by reduced central (CNS) activation failure of the muscles - especially the knee extensors. This considerable loss of muscle strength relates to reduced functional performance. The investigators recently reported that early-commenced physiotherapy, including progressive strength training performed in machines, seems feasible after TKA. The question is, if neuromuscular activity of the muscles in the operated leg, elicited during strength training in machines, can be reached during strength training in more simple forms? Many clinicians are faced with the problem of not having strength training equipment at their institution, or having to prescribe simple strength training exercises for home-based training. Purpose and hypothesis: The purpose of this study is to determine which strength training exercises that activate the muscles in the operated leg the most after TKA. The hypothesis is that strength training exercises performed in machines is more effective compared to strength training performed in more simple forms (using elastic bands or own body weight, etc.). Participants and methods: Twenty participants with a unilateral TKA, operated between 4 to 8 weeks prior to the first investigation, will be included. The participants are investigated twice. During the first investigation, the absolute load (kilograms) corresponding to 10 Repetition Maximum (RM) (a load that can be lifted exactly 10 times) will be determined for all the exercises. At least 72 hours later, the participants will undergo an electromyographic analysis, which determines the neuromuscular activity of the thigh muscles in the operated leg. Ethical issues: From a pilot study, the investigators found that strength training exercises commenced early after TKA seems feasible as the exercises did not increase knee joint swelling or knee pain. None of the financial supporters, or any of the authors, have any potential conflicts of interest with regard to the study.

Official Title
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Neuromuscular Activity of the Operated Leg During Strength Training Performed in Machines and in More Simple Forms After Total Knee Replacement

Conditions
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Osteoarthritis, Knee

Intervention / Treatment
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* Other: Six different strength training exercises


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Unilateral primary TKA Between the age of 18 to 80 years Understand and speak Danish Informed consent 4 to 8 weeks after TKA Exclusion Criteria: Disease/Musculoskeletal disorder, which requires a special rehabilitation modality Alcohol and drug abuse Lack of wish to participate or unwillingness to sign an informed consent

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Intervention Model: Single Group Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Six different strength training exercises<br>Six different strength training exercises are investigated. Four repetitions of each exercise are performed with a relative loading of 10 RM. | Other: Six different strength training exercises<br>* Electromyographic (EMG) activity of the vastus medialis, vastus lateralis, semitendinosus and biceps femoris muscles of the operated leg will be recorded during 6 different strength training exercises. The six exercises performed unilaterally are: seated knee extensions and leg presses in machines (gold standard exercises), and the four other exercises are: sit-to-stands, squats, straight leg raises and seated knee extensions using an elastic band. The relative loading will be 10 repetition maximum (RM). The absolute load (kilograms) corresponding to 10 RM of the 6 strength training exercises is defined a minimum of 3 days before the day where the EMG-data are recorded. Range of motion and time under tension for each repetition will be controlled for.<br>* Other names: Resistance training;|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Normalized neuromuscular activity (EMG) of the quadriceps and hamstring muscles | Normalized electromyographic (EMG) activity (amplitude) during the different exercises. The EMG activity elicited during standardized, maximal contractions is used as a reference for normalization. | One time point, 4 to 8 weeks after TKA | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Arthroplasty, Replacement, Knee, Electromyography, Resistance training, Physical Therapy Modalities