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Updated: May 22, 2026

The Lower Body Positive Pressure Treadmill for Knee Osteoarthritis Rehabilitation
09:10

The Lower Body Positive Pressure Treadmill for Knee Osteoarthritis Rehabilitation

Published on: July 22, 2019

Predicting poor physical performance after total knee arthroplasty.

Michael J Bade1, Pamela Wolfe, Joseph A Zeni

  • 1University of Colorado Physical Therapy Program, Aurora, CO 80045, USA. michael.bade@ucdenver.edu

Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
|April 28, 2012
PubMed
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Preoperative functional tests like the Timed Up and Go (TUG) and Six-Minute Walk (6MW) can predict outcomes after total knee arthroplasty (TKA). Poor baseline performance indicates a higher risk of worse results post-surgery.

Area of Science:

  • Orthopedics
  • Rehabilitation Medicine
  • Biomedical Engineering

Background:

  • Total knee arthroplasty (TKA) is a common procedure for knee osteoarthritis.
  • Predicting functional outcomes after TKA is crucial for patient selection and managing expectations.
  • Current decision-making for TKA may not fully incorporate objective functional performance measures.

Purpose of the Study:

  • To develop a preliminary decision algorithm for predicting functional performance after TKA.
  • To identify preoperative factors that correlate with poor functional outcomes 6 months post-TKA.
  • To aid clinicians in determining optimal timing for TKA based on predicted outcomes.

Main Methods:

  • A cohort of 119 patients undergoing primary unilateral TKA was studied.

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Last Updated: May 22, 2026

The Lower Body Positive Pressure Treadmill for Knee Osteoarthritis Rehabilitation
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The Lower Body Positive Pressure Treadmill for Knee Osteoarthritis Rehabilitation

Published on: July 22, 2019

  • Preoperative data including functional tests (TUG, 6MW, SCT), demographics, and self-reported status were collected.
  • Regression tree analysis was used to identify predictors of 6-month postoperative functional performance.

    • Main Results:

    • Preoperative Timed Up and Go (TUG) time ≥10.1s and age ≥72 years predicted poorer TUG performance post-TKA.
    • Preoperative Six-Minute Walk (6MW) distance <314m predicted poorer 6MW performance post-TKA.
    • Preoperative Stair Climbing Test (SCT) time ≥17s and SF-36 mental component score <40 predicted poorer SCT performance post-TKA. Preoperative scores on these tests were also related to postoperative scores.

    Conclusions:

    • Preoperative functional performance measures (TUG, 6MW, SCT) are significant predictors of outcomes after TKA.
    • Age and mental health status are secondary predictors of functional outcomes.
    • These findings can inform the development of algorithms to predict poor outcomes and guide TKA decisions.