Comparison of Prosthetic Knee Performance During Sitting and Standing

December 7, 2023 updated by: Jason Highsmith, University of South Florida

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.

Study Overview

Status

Completed

Conditions

Amputation

Study Type

Observational

Enrollment (Actual)

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

United States
- Florida
  - Tampa, Florida, United States, 33612
    - University of South Florida

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.

Eligibility Criteria

Ages Eligible for Study

17 years to 61 years (Adult, Older Adult)

Accepts Healthy Volunteers

Yes

Sampling Method

Non-Probability Sample

Study Population

Persons with Transfemoral Amputation

Description

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.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

Observational Models: Other
Time Perspectives: Prospective

Number of groups / cohorts

Cohorts and Interventions

Group / Cohort
Transfemoral Power Knee group Transfemoral amputees who used the power assisted Ossur Power Knee who used the knee daily without adjustments for at least 90 days prior to the study.
Transfemoral C-Leg knee group Transfemoral amputees who used the stance control Otto Bock C-Leg who used the knee daily without adjustments for at least 90 days prior to the study.
Transfemoral Mauch knee group Transfemoral amputees who used the mechanical fluid controlled Mauch Swing and Stance Knee who used the knee daily without adjustments for at least 90 days prior to the study.
Non amputee control group Healthy, non-amputee control group

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

University of South Florida

Investigators

Principal Investigator: M. Jason Highsmith, DPT, CP, USF School of Physical Therapy & Rehab Sciences

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

January 1, 2007

Primary Completion (Actual)

September 30, 2010

Study Completion (Actual)

November 30, 2010

Study Registration Dates

First Submitted

January 10, 2007

First Submitted That Met QC Criteria