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Related Experiment Videos

Porous-coated total hip replacement

C A Engh1, J P Hooten, K F Zettl-Schaffer

  • 1Anderson Orthopaedic Research Institute, Arlington, VA 22206.

Clinical Orthopaedics and Related Research
|January 1, 1994
PubMed
Summary
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Porous-coated hip prostheses show excellent durability over 15 years, with low revision rates for femoral stems (1.5%) and acetabular cups (2.2%). These implants offer reliable fixation and long-term performance in total hip arthroplasty.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Medical Device Engineering

Background:

  • Fifteen years of clinical data on porous-coated hip prostheses were analyzed.
  • Durability of porous-coated fixation was assessed through a clinical follow-up study.
  • Comparison with cemented acetabular components was included.

Purpose of the Study:

  • To evaluate the long-term clinical performance and revision rates of porous-coated femoral and acetabular components in total hip arthroplasty.
  • To assess the mechanical stability and bone remodeling associated with porous-coated implants.
  • To compare the outcomes of porous-coated components with traditional cemented acetabular components.

Main Methods:

  • Clinical follow-up of 393 cases treated before 1985, documenting revisions for femoral and acetabular components.

Related Experiment Videos

  • Analysis of postmortem specimens (15 patients) including mechanical testing of femoral components.
  • Dual-energy X-ray absorptiometry (DEXA) to assess periprosthetic bone mineral content in paired femora.

    • Main Results:

    • Low revision rates for porous-coated femoral stems (1.5%) and acetabular cups (2.2%).
    • Cemented acetabular components had a higher revision rate (7.5%).
    • Mechanical testing showed minimal micromotion (<40 microns) at the porous surface.
    • DEXA revealed 5%-52% periprosthetic bone mineral loss due to remodeling.

    Conclusions:

    • Porous-coated hip prostheses demonstrate durable fixation and low revision rates over 15 years.
    • Porous-coated implants offer a reliable alternative to cemented components, particularly for acetabular fixation.
    • Bone remodeling can lead to significant periprosthetic bone mineral loss, warranting further investigation.