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Related Experiment Videos

An analysis of rotating-platform total knee replacements.

Robert B Bourne1, John Masonis, Mary Anthony

  • 1London Health Sciences Centre, University of Western Ontario, London, Ontario, Canada. robert.bourne@lhsc.on.ca

Clinical Orthopaedics and Related Research
|May 29, 2003
PubMed
Summary

Rotating-platform total knee replacements aim to improve function but show increased wear. Clinical outcomes are similar to fixed-bearing types, suggesting benefits require further proof.

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Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Biomaterials science

Background:

  • Rotating-platform, mobile-bearing total knee replacements (TKR) were designed to enhance knee kinematics, reduce polyethylene contact stress, and improve implant alignment.
  • These designs aim to mimic natural knee motion and potentially improve long-term implant survival.

Purpose of the Study:

  • To evaluate key biomechanical parameters and clinical outcomes associated with rotating-platform TKR.
  • To compare the performance of rotating-platform TKR with fixed-bearing designs.

Main Methods:

  • Gait analysis to determine knee flexion during the stance phase.
  • Contact area studies to classify implant congruency (gait vs. total).
  • Knee simulator studies to assess gravimetric wear.

Related Experiment Videos

  • Comparison of clinical outcomes (scores, range of motion, complications) with fixed-bearing TKRs.

    • Main Results:

    • Normal gait involves 8-15 degrees of knee flexion during the stance phase.
    • Rotating-platform TKRs exist as gait congruous or totally congruous designs.
    • Knee simulator studies indicated higher gravimetric wear for rotating-platform TKRs compared to fixed-bearing types.
    • Rotate-only designs exhibited less wear than rotate-and-translate designs.
    • Clinical studies reported comparable outcomes between rotating-platform and fixed-bearing TKR.

    Conclusions:

    • While rotating-platform total knee replacements offer theoretical advantages, their benefits are not yet definitively proven by current evidence.
    • Further research is needed to validate the purported benefits of these advanced TKR designs.
    • Wear characteristics differ between rotating-platform designs, with simpler rotation showing less wear.