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

NCT ID: NCT01708980

Last Updated: 2013-10-23

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE1
• Total Enrollment: 24 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2012-10-31
• Study Completion Date: 2013-02-28

Brief Summary

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.

Conditions

Osteoarthritis, Knee

Keywords

Arthroplasty, Replacement, Knee; Electromyography; Resistance training; Physical Therapy Modalities

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Six different strength training exercises

Six different strength training exercises are investigated. Four repetitions of each exercise are performed with a relative loading of 10 RM.

Group Type: EXPERIMENTAL

Six different strength training exercises

Intervention Type: OTHER

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.

Interventions

Six different strength training exercises

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.

Intervention Type: OTHER

Other Intervention Names

Resistance training

Eligibility Criteria

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

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 80 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Copenhagen University Hospital, Hvidovre

OTHER

Sponsor Role: lead

Responsible Party

Thomas Linding Jakobsen

Research Physiotherapist

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Thomas Bandholm, PhD

Role: STUDY_DIRECTOR

Clinical Research Center, Copenhagen University Hospital, Hvidovre, Denmark

Locations

Clinical Research Centre, Copenhagen University Hospital, Hvidovre

Hvidovre, Copenhagen, Denmark

Countries

Denmark

References

Jakobsen TL, Husted H, Kehlet H, Bandholm T. Progressive strength training (10 RM) commenced immediately after fast-track total knee arthroplasty: is it feasible? Disabil Rehabil. 2012;34(12):1034-40. doi: 10.3109/09638288.2011.629019. Epub 2011 Nov 15.

Reference Type: BACKGROUND

PMID: 22084974 (View on PubMed)

Holm B, Kristensen MT, Bencke J, Husted H, Kehlet H, Bandholm T. Loss of knee-extension strength is related to knee swelling after total knee arthroplasty. Arch Phys Med Rehabil. 2010 Nov;91(11):1770-6. doi: 10.1016/j.apmr.2010.07.229.

Reference Type: BACKGROUND

PMID: 21044725 (View on PubMed)

Jakobsen TL, Jakobsen MD, Andersen LL, Husted H, Kehlet H, Bandholm T. Quadriceps muscle activity during commonly used strength training exercises shortly after total knee arthroplasty: implications for home-based exercise-selection. J Exp Orthop. 2019 Jul 2;6(1):29. doi: 10.1186/s40634-019-0193-5.

Reference Type: DERIVED

PMID: 31267365 (View on PubMed)

Other Identifiers

2012-09-TLJ

Identifier Type: -

Identifier Source: org_study_id