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Related Experiment Videos

Porous-coated metal-backed patellar components in total knee replacement. A postmortem retrieval analysis

R D Bloebaum1, K N Bachus, J W Jensen

  • 1Bone and Joint Research Laboratory, Veterans Affairs Medical Center, Salt Lake City, Utah 84148, USA. roy.bloebaum@hsc.edu

The Journal of Bone and Joint Surgery. American Volume
|May 1, 1998
PubMed
Summary

Porous-coated patellar components showed significant bone contact but limited bone ingrowth. Further research is needed to optimize fixation for pain relief in knee replacement surgery.

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Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Biomedical engineering

Background:

  • Porous-coated patellar components aim for bone ingrowth fixation and pain relief.
  • The efficacy of these implants requires rigorous evaluation.

Purpose of the Study:

  • To quantitatively assess bone ingrowth and fixation in retrieved porous-coated metal-backed patellar components.

Main Methods:

  • Postmortem analysis of eleven retrieved patellar components.
  • Utilized high-resolution contact radiography, electron microscopy, and histological analysis.
  • Implants were in situ for a mean of 45 months.

Main Results:

  • Mean bone contact with porous coating was 86%.

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  • Mean bone ingrowth volume fraction was 13%.
  • No significant difference in bone ingrowth between porous coating and host bone.

    • Conclusions:

    • While porous coatings achieve substantial bone contact, bone ingrowth is limited.
    • The observed bone ingrowth may not be sufficient for optimal pain relief.
    • Further investigation into implant design and biological response is warranted.