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Related Experiment Videos

Predictive range of motion after total knee replacement.

M A Ritter, E A Stringer

    Clinical Orthopaedics and Related Research
    |September 1, 1979
    PubMed
    Summary

    Total knee arthroplasty can achieve normal knee alignment. Postoperative range of motion may depend on preoperative flexion, particularly if less than 75 degrees, but not on prosthesis design or patient factors.

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    Area of Science:

    • Orthopedic Surgery
    • Biomedical Engineering

    Background:

    • Total knee arthroplasty (TKA) aims to restore knee function and alignment.
    • Preoperative knee deformity can complicate surgical outcomes.

    Purpose of the Study:

    • To evaluate the achievability of normal knee alignment and range of motion after TKA.
    • To identify factors influencing postoperative knee motion and stability.

    Main Methods:

    • Retrospective analysis of 145 consecutive total knee arthroplasties.
    • Preoperative and postoperative assessment of knee alignment, extension, and flexion.
    • Statistical analysis to correlate outcomes with preoperative deformity, patient factors, and prosthesis design.

    Main Results:

    • Normal knee alignment with full extension was consistently achievable, irrespective of preoperative deformity (varus, valgus, flexion contracture).
    • Postoperative flexion may be limited by preoperative range of motion, especially if <75 degrees.
    • Prosthesis design, sex, age, and rheumatoid arthritis diagnosis did not correlate with postoperative motion or stability.
    • Osteoarthritic knees showed a general decrease in range of motion postoperatively compared to preoperatively at 6 and 12 months.

    Conclusions:

    • Total knee arthroplasty can effectively restore normal knee alignment.
    • Preoperative range of motion is a key predictor of postoperative flexion, particularly in cases with limited preoperative motion.
    • Factors such as prosthesis design and patient demographics do not significantly impact TKA outcomes regarding motion and stability.

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