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Comparison of Prosthetic Knee Performance During Sitting and Standing

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ClinicalTrials.gov Identifier: NCT00421356
Recruitment Status : Completed
First Posted : January 12, 2007
Last Update Posted : August 6, 2010
Information provided by:
University of South Florida

January 10, 2007
January 12, 2007
August 6, 2010
January 2007
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Complete list of historical versions of study NCT00421356 on ClinicalTrials.gov Archive Site
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Comparison of Prosthetic Knee Performance During Sitting and Standing
Kinetic and Kinematic Comparison of Power Assisted Versus Stance Control Artificial Knees During Sit To Stand
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.
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Time Perspective: Prospective
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Non-Probability Sample
Persons with Transfemoral Amputation
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*   Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
February 2009
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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.
Sexes Eligible for Study: All
21 Years to 65 Years   (Adult)
Contact information is only displayed when the study is recruiting subjects
United States
US DOE RSA Award # H235J050020
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M. Jason Highsmith-PI, University of South Florida
University of South Florida
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Principal Investigator: M. Jason Highsmith, DPT, CP USF School of Physical Therapy & Rehab Sciences
University of South Florida
April 2007