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Related Experiment Videos

Broken wings--common with the Hardinger plug.

Per Svedmark1, Per Wretenberg, Andre Stark

  • 1Department of Orthopaedics Karolinska Sjukhuset, Stockholm, Sweden. per.svedmark@ks.se

Acta Orthopaedica Scandinavica
|October 3, 2002
PubMed
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The Hardinger occluder plug showed wing fractures in total hip arthroplasty, but occlusion remained effective. Loose polyethylene wings contacted bone and prosthesis without compromising the procedure.

Area of Science:

  • Orthopedic Surgery
  • Biomaterials Science
  • Medical Device Engineering

Background:

  • The Hardinger occluder plug is utilized in total hip arthroplasty.
  • Polyethylene components in orthopedic implants are susceptible to wear and fracture.

Purpose of the Study:

  • To evaluate the performance and potential complications of the Hardinger occluder plug in total hip arthroplasty.
  • To investigate the behavior and location of fractured polyethylene wings within the femoral canal.

Main Methods:

  • Analysis of 51 consecutive total hip arthroplasties using the Hardinger occluder plug.
  • Examination of fractured polyethylene wings and their placement in the femoral canal.
  • Creation of a saw-bone model with a cemented Charnley prosthesis and loose wings for further study.

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Main Results:

  • Fracture of one or more polyethylene wings occurred in 34 out of 51 hips.
  • Up to 7 loose wings were observed in 2 arthroplasties.
  • Despite wing fractures, no occlusion failures were reported; loose wings were found to contact both bone and prosthesis.

Conclusions:

  • The Hardinger occluder plug demonstrated resilience, maintaining occlusion despite significant polyethylene wing fracturing.
  • Fractured wings can become loose within the femoral canal, interacting with bone and the prosthesis.
  • Further research may be warranted to assess the long-term implications of loose wing fragments in total hip arthroplasty.