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Tripolar hip replacement for recurrent prosthetic dislocation

P Grigoris1, M J Grecula, H C Amstutz

  • 1Joint Replacement Institute, Orthopaedic Hospital, Los Angeles, CA.

Clinical Orthopaedics and Related Research
|July 1, 1994
PubMed
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A novel tripolar hip implant effectively treats unstable total hip arthroplasty by using a large acetabular cup and appropriately sized bipolar femoral head. This innovative approach achieved joint stability in all eight patients studied, demonstrating its potential for recurrent dislocations.

Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Arthroplasty research

Background:

  • Recurrent dislocations after total hip arthroplasty (THA) present a significant challenge.
  • Existing treatments for unstable THA may have limitations in achieving long-term stability.
  • The development of advanced implant designs is crucial for improving THA outcomes.

Observation:

  • A novel tripolar hip implant configuration was utilized.
  • This configuration involves a large inside diameter acetabular cup and a bipolar femoral head.
  • The femoral head was specifically sized to match the diameter of a normal hip joint.

Findings:

  • Eight consecutive patients with a history of recurrent prosthetic dislocations underwent treatment with this tripolar hip system.

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  • Complete joint stability was successfully achieved in all treated patients.
  • The average follow-up period was 4.2 years, with a range of 2.6 to 6.3 years, indicating sustained stability.

    • Implications:

    • This tripolar hip design offers a promising solution for managing unstable total hip arthroplasty.
    • The findings suggest a potential reduction in dislocation rates for patients with challenging THA cases.
    • Further research and larger trials could validate this technique for broader clinical application in hip reconstruction.