Alterations in Muscle After Total Knee Arthroplasty

Study Purpose

The overall goals of this work are: 1) to elucidate alterations in gene expression and downstream protein synthesis 2 weeks after Total Knee Arthroplasty (TKA) to better explain quadriceps muscle atrophy after TKA and 2) understand the mechanisms responsible for improved maintenance of muscle strength with Neuromuscular Electrical Stimulation (NMES) utilization. Furthermore, this investigation seeks to expand previous findings regarding attenuation of strength and functional performance deficits with NMES application to better understand how altered gene expression influences muscle function.

Recruitment Criteria

Accepts Healthy Volunteers

Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms

Study Type

An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes.

An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes.

Searching Both is inclusive of interventional and observational studies.

Eligible Ages 50 Years - 75 Years
Gender All
More Inclusion & Exclusion Criteria

Inclusion Criteria:

- 50 to 75 years of age - Scheduled for unilateral TKA at University of Colorado Hospital - Diagnosed with osteoarthritis - Cognitive status that allows patients to consistently comprehend and repeat back directions regarding the details of the study

Exclusion Criteria:

- Neurological, vascular or cardiac problems that significantly limit function - BMI > 35 - Testosterone supplementation - Pregnancy - Anticoagulant therapy

Trial Details

Trial ID:

This trial id was obtained from, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.


Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans.

Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data.

Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs.

Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.

Lead Sponsor

The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.

University of Colorado, Denver
Principal Investigator

The person who is responsible for the scientific and technical direction of the entire clinical study.

Victor Cheuy, PhD
Principal Investigator Affiliation University of Colorado, Denver
Agency Class

Category of organization(s) involved as sponsor (and collaborator) supporting the trial.

Overall Status Recruiting
Countries United States

The disease, disorder, syndrome, illness, or injury that is being studied.

Knee Osteoarthritis
Arms & Interventions


Experimental: Neuromuscular Electrical Stimulation

Neuromuscular Electrical Stimulation (NMES) 48 hours after TKA, 5x/week, 2x/day, for 45 minutes/session. Standard Rehabilitation Protocol

Active Comparator: Control

Standard Rehabilitation Protocol


Procedure: - Neuromuscular electrical stimulation (NMES)

5x/week, 2x/day, for 45 minutes/session

Behavioral: - Standard Rehabilitation Protocol

Standard physical therapy after TKA

Contact a Trial Team

If you are interested in learning more about this trial, find the trial site nearest to your location and contact the site coordinator via email or phone. We also strongly recommend that you consult with your healthcare provider about the trials that may interest you and refer to our terms of service below.

Aurora, Colorado




Univeristy of Colorado Anschutz Medical Campus

Aurora, Colorado, 80045

Site Contact

Kristine Gerron, BS

[email protected]


Aurora, Colorado


Not yet recruiting


University of Colorado School of Medicine

Aurora, Colorado, 80045

Site Contact

Kristine Gerron, BS

[email protected]