A Biomechanical Evaluation of the Ossur Power Knee in Persons With Transfemoral Amputation

Description

Microprocessor-controlled knees (MPKs) do not typically utilize motors to power joint rotation, but they automatically adjust resistance or damping in the joint to improve swing- and/or stance-phase control as appropriate for the prosthesis user during gait. The Ossur Power Knee is the only commercially-available MPK that uses a motor to provide active power generation during walking and other activities. The purpose of this proposed investigation is to perform and compare biomechanical evaluations of the Power Knee and Ossur Rheo XC, a passive MPK, during walking and other activities by prosthesis users. Furthermore, mobility between male and female subjects will be compared to determine if there are differences in prosthetic knee usage on the basis of sex.

Conditions

Transfemoral Amputation, Limb Loss, Limb Absence

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Study Details

Study overview

Microprocessor-controlled knees (MPKs) do not typically utilize motors to power joint rotation, but they automatically adjust resistance or damping in the joint to improve swing- and/or stance-phase control as appropriate for the prosthesis user during gait. The Ossur Power Knee is the only commercially-available MPK that uses a motor to provide active power generation during walking and other activities. The purpose of this proposed investigation is to perform and compare biomechanical evaluations of the Power Knee and Ossur Rheo XC, a passive MPK, during walking and other activities by prosthesis users. Furthermore, mobility between male and female subjects will be compared to determine if there are differences in prosthetic knee usage on the basis of sex.

Do Transfemoral Prostheses With Powered Prosthetic Knee Flexion and Extension Improve Mobility? A Biomechanical Evaluation of the Ossur Power Knee

A Biomechanical Evaluation of the Ossur Power Knee in Persons With Transfemoral Amputation

Condition
Transfemoral Amputation
Intervention / Treatment

-

Contacts and Locations

Chicago

Jesse Brown VA Medical Center, Chicago, IL, Chicago, Illinois, United States, 60612

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

For general information about clinical research, read Learn About Studies.

Eligibility Criteria

  • * Unilateral, transfemoral amputation (any etiology).
  • * Age from 45-75 years.
  • * Residual limb length classified as standard (i.e., medium) to long.
  • * Prosthesis user for at least 1 year prior to enrolling in the study.
  • * K3 or K4 level ambulator.
  • * Good sensation on their residual limb(s) (upon routine clinical examination).
  • * Good skin integrity upon visual inspection.
  • * Does not require the use of assistive devices to walk for short distances.
  • * Not currently taking medications that are known to affect balance or gait.
  • * Presents with good socket fit based upon a standard assessment by the study prosthetist.
  • * Bilateral amputations
  • * Individuals with a knee disarticulation

Ages Eligible for Study

45 Years to 75 Years

Sexes Eligible for Study

ALL

Accepts Healthy Volunteers

No

Collaborators and Investigators

VA Office of Research and Development,

Steven A Gard, PhD, PRINCIPAL_INVESTIGATOR, Jesse Brown VA Medical Center, Chicago, IL

Study Record Dates

2027-03-31