- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT03974945
Does Walking Performance Improve When Veterans With Leg Amputations Are Given Visual Feedback?
Can Sensory Feedback Training Improve the Biomechanical and Metabolic Effects of Using Passive or Powered Lower Limb Prostheses During Walking for Veterans With Transtibial Amputations?
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Due to the functional impairments caused by a lower limb amputation, it is essential to determine the benefits of rehabilitation strategies such as real-time visual feedback training. Such training could allow Veterans with transtibial amputations (TTAs) to better utilize their prostheses and regain the greatest possible level of function. It is not clear how much the prosthetic device (passive-elastic prosthetic foot versus battery-powered ankle-foot prosthesis) and/or the user's response to the prosthesis contribute to the biomechanical and metabolic effects of using these prostheses during walking. Better use of a prosthesis due to targeted real-time visual feedback training could enhance rehabilitation, improve function and reduce asymmetric biomechanics, which in turn could reduce common comorbidities such as osteoarthritis, leg and back pain, and indirectly, diabetes in Veterans with TTAs. The purpose of the proposed project is to systematically establish the metabolic and biomechanical effects of targeted real-time visual feedback training of peak propulsive ground reaction force (GRF) on the biomechanics, metabolic costs, and muscle activity of Veterans with TTAs using their own passive-elastic prosthetic foot and a battery-powered ankle-foot prosthesis. The results of the investigators' research could enhance the use of prosthetic technology to improve the rehabilitation and function of Veterans with lower limb amputations.
Previous studies suggest that use of passive-elastic and/or powered ankle-foot prostheses may not optimize the function of Veterans with TTAs during walking. Targeted, real-time visual feedback training of peak propulsive ground reaction forces increased propulsion and improved walking function in older (>65 years) and post-stroke adults, who typically have impaired ankle power. To the investigators' knowledge, no research has addressed how visual feedback of peak propulsive force affects the use of passive-elastic or powered ankle-foot prostheses by people with TTAs. In the proposed research, the investigators will determine the underlying metabolic costs, biomechanics, stability, and muscle activity resulting from targeted real-time visual feedback training of peak propulsive force to identify how Veterans with a TTA benefit from more effective use of a passive-elastic prosthesis and/or a battery-powered ankle-foot prosthesis and to determine if the addition of mechanical power provided by a battery-powered ankle-foot prosthesis can further enhance the function of Veterans with unilateral TTAs during walking. 30 Veterans with unilateral TTAs will use their own passive-elastic prosthesis both with and without visual feedback training during level-ground walking, while the investigators measure their metabolic costs and biomechanics. Then, they will use a powered ankle-foot prosthesis (emPOWER, BiONX, Ottobock) both with and without visual feedback training during level-ground walking, while the investigators measure their metabolic costs and biomechanics. With each prosthesis, subjects will walk at 1.25 m/s on a dual-belt force-measuring treadmill 1) with no visual feedback, and then with real-time visual feedback of: 2) peak propulsive force from the "no feedback" condition, 3) +20% greater peak propulsive force, and 4) +40% greater peak propulsive force. During these visual feedback trials, the investigators will ask subjects to match the peak propulsive force displayed on a computer screen with their affected leg. The investigators will also ask subjects to: 5) match symmetric visual feedback of the peak propulsive force from both legs. The investigators will determine if Veterans with TTAs utilizing real-time visual feedback training of peak propulsive force can improve metabolic costs, biomechanical symmetry, and dynamic stability/balance, while using their own passive-elastic prosthesis or a powered ankle-foot prosthesis. The investigators will also establish if Veterans with TTAs can retain the metabolic and biomechanical benefits elicited by real-time visual feedback training once that feedback is removed. Results from the proposed project will be used to inform rehabilitation strategies and prosthetic design, which could ultimately improve health, maximize function, and improve quality of life for Veterans with TTAs.
Study Type
Enrollment (Estimated)
Contacts and Locations
Study Contact
- Name: Alena Grabowski, PhD BA
- Phone Number: (720) 435-4270
- Email: Alena.Grabowski@va.gov
Study Locations
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Colorado
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Aurora, Colorado, United States, 80045
- Recruiting
- Rocky Mountain Regional VA Medical Center, Aurora, CO
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Contact:
- Alena Grabowski, PhD BA
- Phone Number: 720-435-4270
- Email: Alena.Grabowski@va.gov
-
Principal Investigator:
- Alena Grabowski, PhD BA
-
-
Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Sampling Method
Study Population
Description
Inclusion Criteria:
- One amputation below the knee
- At least 1 year of experience using a prosthesis
- No current problems with the prosthesis or residual limb
- At or above a K3 Medicare Functional Classification Level
Exclusion Criteria:
- Poor general health
- Difficulty with mobility
- Problems with balance or dizziness
- Current serious musculoskeletal injury besides that associated with an amputation
- Cardiovascular, pulmonary, or neurological disease or disorder
Study Plan
How is the study designed?
Design Details
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
---|---|
Participants with Transtibial Amputation
The investigators will recruit participants with unilateral transtibial amputations who are at or above a K3 Medicare functional classification level (MFCL), and 18-60 years old.
A K3 MFCL means that a person has the ability or potential for ambulation with variable cadence.
A person at K3 MFCL is a typical community ambulator who has the ability to traverse most environmental barriers and may have vocational, therapeutic or exercise activity that demands prosthetic use beyond simple locomotion.
|
The investigators will measure the biomechanics (motion, forces, and muscle activity) and metabolic rates while subjects walk using their own passive-elastic prosthesis with and without visual feedback of peak propulsive force targets.
The investigators will measure the biomechanics (motion, forces, and muscle activity) and metabolic rates while subjects walk using a battery-powered ankle-foot prosthesis with and without visual feedback of peak propulsive force targets.
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Measure Description |
Time Frame |
---|---|---|
Motion will be measured using 3D motion capture
Time Frame: Through study completion, an average of 1 year
|
The investigators will measure motion (rad) while participants walk using a passive elastic and battery-powered ankle-foot prosthesis and are given different visual feedback targets of peak propulsive force.
|
Through study completion, an average of 1 year
|
Forces will be measured using a force-measuring treadmill
Time Frame: Through study completion, an average of 1 year
|
The investigators will measure forces (N) while participants walk using a passive elastic and battery-powered ankle-foot prosthesis and are given different visual feedback targets of peak propulsive force.
|
Through study completion, an average of 1 year
|
Rates of oxygen consumption and carbon dioxide production will be measured using indirect calorimetry to calculate metabolic power
Time Frame: Through study completion, an average of 1 year
|
The investigators will measure metabolic rates and calculate metabolic power (W/kg) while participants walk using a passive elastic and battery-powered ankle-foot prosthesis and are given different visual feedback targets of peak propulsive force.
|
Through study completion, an average of 1 year
|
Muscle activity will be measured using wireless surface electromyography (sEMG)
Time Frame: Through study completion, an average of 1 year
|
The investigators will measure muscle activity (V) while participants walk using a passive elastic and battery-powered ankle-foot prosthesis and are given different visual feedback targets of peak propulsive force.
|
Through study completion, an average of 1 year
|
Collaborators and Investigators
Investigators
- Principal Investigator: Alena Grabowski, PhD BA, Rocky Mountain Regional VA Medical Center, Aurora, CO
Study record dates
Study Major Dates
Study Start (Actual)
Primary Completion (Estimated)
Study Completion (Estimated)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Actual)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Keywords
Other Study ID Numbers
- A2943-R
Plan for Individual participant data (IPD)
Plan to Share Individual Participant Data (IPD)?
Drug and device information, study documents
Studies a U.S. FDA-regulated drug product
Studies a U.S. FDA-regulated device product
product manufactured in and exported from the U.S.
This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.
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