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Related Experiment Videos

Screw home motion after total knee replacement

Y Ishii1, K Terajima, Y Koga

  • 1Ishii Orthopaedic and Rehabilitation Clinic, Saitama, Japan.

Clinical Orthopaedics and Related Research
|February 12, 1999
PubMed
Summary

Posterior cruciate ligament retaining knee replacements maintain screw home motion under load. Muscle activity significantly influences prosthetic knee motion, potentially more than ligaments in current designs.

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Area of Science:

  • Orthopedic surgery
  • Biomechanics
  • Biomedical engineering

Background:

  • Screw home motion is a critical component of natural knee function.
  • Understanding factors influencing screw home motion in total knee replacement (TKR) is essential for improving prosthesis design and patient outcomes.
  • The roles of the posterior cruciate ligament (PCL) and muscle forces in TKR screw home motion require further elucidation.

Purpose of the Study:

  • To evaluate the impact of muscle force and PCL presence on screw home motion in TKR.
  • To compare screw home motion between PCL-retaining and PCL-substituting TKR designs under varying loads.

Main Methods:

  • A comparative study involving 10 PCL-retaining and 10 PCL-substituting TKR knees.
  • Screw home motion was measured using a 6-degrees-of-freedom electrogoniometer.

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  • Measurements were taken during active extension with no external load, 2 kg external load, and body weight external load.

    • Main Results:

    • PCL-retaining prostheses maintained screw home motion under all tested conditions (no load, 2 kg, body weight).
    • PCL-substituting prostheses maintained screw home motion only under body weight load, not with a 2 kg load.
    • Muscle activity demonstrated a significant influence on screw home motion, comparable to or exceeding the effect of ligamentous structures in current TKR designs.

    Conclusions:

    • The presence of the PCL is crucial for maintaining screw home motion in TKR, especially under lower loads.
    • Muscle activity plays a vital role in achieving screw home motion in TKR, potentially surpassing the influence of ligamentous structures in contemporary designs.
    • These findings suggest that optimizing muscle function and considering PCL function are key for improving TKR performance.