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Functional evaluation of total knee replacement.

R K Laughman, R N Stauffer, D M Ilstrup

    Journal of Orthopaedic Research : Official Publication of the Orthopaedic Research Society
    |January 1, 1984
    PubMed
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    Objective assessment of knee function after prosthetic knee replacement is now possible. A new performance index (Ip) shows significant improvement in patients 1 year post-total knee replacement (TKR), with newer prostheses yielding better results.

    Area of Science:

    • Orthopedic surgery
    • Biomedical engineering
    • Rehabilitation science

    Background:

    • Current assessment of prosthetic knee replacement outcomes lacks objective criteria.
    • Evaluating knee joint function post-surgery is crucial for patient recovery and prosthesis efficacy.

    Purpose of the Study:

    • To describe an automated laboratory method for objective knee joint function assessment.
    • To develop and validate a Performance Index (Ip) for evaluating outcomes after total knee replacement (TKR).

    Main Methods:

    • Statistically selected and weighted nine biomechanical parameters to create a Performance Index (Ip).
    • Studied 192 patients (274 knees) pre-surgery and 107 patients (138 knees) at 1-year post-TKR.
    • Assessed prostheses by generic classes and specific design types, including patellar resurfacing.

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    Main Results:

    • Preoperative rheumatoid knees showed significantly poorer function than degenerative knees.
    • Patients demonstrated marked functional improvement 1 year post-TKR, nearing lower normal limits.
    • Newer generation prostheses and patellar resurfacing components led to improved functional outcomes.

    Conclusions:

    • The developed automated method and Performance Index provide objective criteria for assessing knee function post-prosthetic replacement.
    • Total knee replacement significantly improves function, especially with advanced prosthesis designs and patellar resurfacing.
    • This objective assessment aids in evaluating prosthesis effectiveness and guiding clinical decisions.