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RECRUITING Not applicable ClinicalTrials.gov

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

Sponsor: VA Office of Research and Development • ClinicalTrials.gov ID: NCT06218238

Registry updated: 2026-09-22
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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.

Interventions

  • Powered prosthetic knee joint (Other)
    Subjects will be fitted and trained on the Ossur Power Knee. An accommodation of 1 month will be provided prior to evaluation with the knee joint.
  • Conventional microprocessor-controlled prosthetic knee joint (Other)
    Subjects will be fitted and trained on the Ossur Rheo XC Knee. An accommodation of 1 month will be provided prior to evaluation with the knee joint.

Eligibility criteria

Inclusion Criteria: * Unilateral, transfemoral amputation (any etiology) * 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 Exclusion Criteria: * Bilateral amputations * Individuals with a knee disarticulation

Conditions

Transfemoral Amputation Limb Loss Limb Absence

Locations

  • Jesse Brown VA Medical Center, Chicago, IL — Chicago, Illinois, United States
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Official Source

Data sourced from ClinicalTrials.gov, a service of the U.S. National Institutes of Health.

View Official Record