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Related Experiment Videos

Does the Additional Articulation in Retrieved Bipolar Hemiarthroplasty Implants Decrease Trunnionosis Compared to

Christopher Del Balso1, Matthew G Teeter2, Sok C Tan1

  • 1Division of Orthopaedic Surgery, Department of Surgery, Schulich School of Medicine and Dentistry, Western University, London Health Sciences Centre, University Hospital, London, Ontario, Canada.

The Journal of Arthroplasty
|October 17, 2017
PubMed
Summary

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This summary is machine-generated.

Bipolar hemiarthroplasty (BH) implants show less fretting damage than metal-on-polyethylene total hip arthroplasty (MoP THA) implants. Longer implantation times increase corrosion risk for both BH and MoP THA prostheses.

Area of Science:

  • Orthopedic surgery
  • Biomaterials science
  • Failure analysis of medical implants

Background:

  • Trunnionosis, a mode of failure in metal-on-polyethylene total hip arthroplasty (MoP THA), occurs at the modular head-neck taper interface.
  • Understanding fretting and corrosion at this interface is crucial for improving implant longevity.

Purpose of the Study:

  • To compare fretting and corrosion at the head-neck taper junction between retrieved bipolar hemiarthroplasty (BH) and MoP THA implants.
  • To identify factors influencing fretting and corrosion in these hip arthroplasty designs.

Main Methods:

  • Retrieval analysis of 15 BH and matched MoP THA femoral heads and stems implanted for at least 2 years.
  • Stereomicroscopic visualization to score fretting and corrosion damage.
Keywords:
bipolar hemiarthroplastycorrosionfrettingtotal hip arthroplastytrunnionosis

Related Experiment Videos

  • Statistical comparison of damage scores between BH and MoP THA groups.

    • Main Results:

    • Femoral heads from BH implants demonstrated significantly less fretting damage compared to MoP THA implants (P = .02).
    • Total corrosion scores positively correlated with implantation duration for both implant types (ρ = 0.54, P < .02).
    • No association found between increased fretting and corrosion in 28-mm MoP THA heads.

    Conclusions:

    • BH implants exhibit reduced fretting at the head-neck taper compared to MoP THA, potentially due to decreased torque from added articulation.
    • Increased fretting in MoP THA does not correlate with increased corrosion for the specific 28-mm head design studied.
    • Prolonged implantation time elevates the risk of corrosion-related damage in both BH and MoP THA prostheses.