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Related Experiment Videos

Polyethylene wear in uncemented knee replacements.

S M Jones1, I M Pinder, C G Moran

  • 1Freeman Hospital, Newcastle upon Tyne, England.

The Journal of Bone and Joint Surgery. British Volume
|January 1, 1992
PubMed
Summary

Wear of the polyethylene tibial component caused failure in five knee replacements. This resulted in pain, swelling, instability, and deformity due to extensive medial wear.

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Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Medical device engineering

Background:

  • Uncemented porous-coated knee replacements are widely used.
  • Polyethylene tibial components are critical for joint function.
  • Component wear can lead to implant failure and revision surgery.

Purpose of the Study:

  • To investigate the causes of isolated polyethylene tibial component wear.
  • To analyze the clinical presentation and radiographic findings associated with this wear.
  • To identify potential contributing factors to wear in uncemented knee arthroplasty.

Main Methods:

  • Retrospective review of 108 uncemented porous-coated knee replacements.
  • Clinical assessment of patients experiencing component failure.
  • Radiographic analysis of implant alignment and wear patterns.
  • Examination of explanted components for wear characteristics.

Main Results:

  • Five out of 108 (4.6%) knee replacements failed due to isolated polyethylene tibial component wear.
  • Clinical symptoms included pain, effusion, instability, and progressive varus deformity.
  • Extensive wear was consistently observed on the medial side of the polyethylene surface.

Conclusions:

  • Isolated polyethylene wear can be a mode of failure in uncemented porous-coated knee replacements.
  • The unconstrained nature and incongruity of the joint surfaces likely contribute to wear.
  • Further investigation into design characteristics influencing wear is warranted.

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