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Comparison of Prosthetic Knee Performance During Sitting and Standing

This study has been completed.
Information provided by:
University of South Florida Identifier:
First received: January 10, 2007
Last updated: August 5, 2010
Last verified: April 2007
The Ossur Prosthetic Power Knee claims to assist in helping people with transfemoral amputation to walk up stairs and stand up from sitting. We expect to find that this product has the ability to help unload the sound knee during these tasks. We plan to collect force and motion data while people stand up from a chair. We will compare the data from people using several types of prosthetic knees, including the power knee as well as from people who are not amputees to see what the force and motion contributions are from the different knees evaluated.

Condition Phase
Amputation Early Phase 1

Study Type: Observational
Study Design: Time Perspective: Prospective
Official Title: Kinetic and Kinematic Comparison of Power Assisted Versus Stance Control Artificial Knees During Sit To Stand

Further study details as provided by University of South Florida:

Estimated Enrollment: 35
Study Start Date: January 2007
Study Completion Date: February 2009

Ages Eligible for Study:   21 Years to 65 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes
Sampling Method:   Non-Probability Sample
Study Population
Persons with Transfemoral Amputation

Inclusion Criteria:

  • 7 control subjects with normal lower extremity function: mentally independent adults with intact extremities. These individuals shall have no significant medical history that would impair their ability to perform 3, repeated, sit to stand trials. Exclusionary examples might include history positive for total joint arthroplasty of the hip or knee and significant cardiomyopathy. Control subjects will be non-amputee, generally healthy individuals, mentally capable of providing informed consent. They will have no significant medical history that could be perceived by investigators to hinder the ability to transfer. Anyone not meeting these criteria cannot be a control subject.
  • 28 subjects with unilateral amputation at the level of the thigh. 7 each in four groups:

    1. Active Extension Group: Power Knee
    2. Microprocessor Stance Control Group: C-Leg, Rheo, Adaptive
    3. Non-Microprocessor Stance Control Group: Mauch, Catech or other stance control units
    4. Non-Microprocessor and Non-Stance Control units: WASB, polycentrics, pneumatics Each subject must have a prosthesis for which they have had for a minimum of 90 days in its present condition.
  • All subjects must be:

    1. at least 21 years of age,
    2. mentally independent, and
    3. able to give informed consent.

Exclusion Criteria:

  • Subjects are not candidates if they:

    1. are under 21 years of age
    2. are mentally dependent and unable to provide their own informed consent
    3. have worn the present prosthesis for less than 90 days in the current condition
    4. have bilateral amputation
  • Subjects with an amputation are not candidates if they only use a prosthesis for transfers or therapy (K0 or K1 Medicare functional class). They must be independently ambulatory, at some level in the community (Medicare functional class "K2-K4"). They are furthermore not a candidate for this study if they have bilateral amputation (at any level) of the lower extremity as the purpose is to determine sound versus involved side loading, then against control. If all of the latter criteria are satisfied, the final piece is the 90 day prosthetic accommodation period. Candidacy then hinges upon the fact that they are accommodated to their current prosthesis as evident by having worn the current device, unaltered for the 90 days prior to testing.
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Please refer to this study by its identifier: NCT00421356

United States, Florida
University of South Florida
Tampa, Florida, United States, 33612
Sponsors and Collaborators
University of South Florida
Principal Investigator: M. Jason Highsmith, DPT, CP USF School of Physical Therapy & Rehab Sciences
  More Information

Responsible Party: M. Jason Highsmith-PI, University of South Florida Identifier: NCT00421356     History of Changes
Other Study ID Numbers: 104850
US DOE RSA Award # H235J050020
Study First Received: January 10, 2007
Last Updated: August 5, 2010

Keywords provided by University of South Florida:
amputation, transfemoral, lower extremity, prosthetic knee processed this record on August 17, 2017