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Related Experiment Videos

Unconstrained tripolar hip implants: effect on hip stability.

Olivier Guyen1, Qing Shan Chen, Jacques Bejui-Hugues

  • 1Biomechanics Laboratory, Division of Orthopedic Research, Mayo Clinic, Rochester, MN 45905, USA.

Clinical Orthopaedics and Related Research
|February 7, 2007
PubMed
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Tripolar implants enhance hip range of motion and stability for unstable total hip arthroplasties. These implants increase flexion, adduction, and rotation, reducing dislocation risk.

Area of Science:

  • Orthopedic surgery
  • Biomedical engineering
  • Implant design

Background:

  • Unstable total hip arthroplasties pose challenges in revision surgery.
  • Tripolar implants are increasingly used, but their efficacy requires further validation.
  • Larger effective head size of tripolar implants theoretically improves range of motion and stability.

Purpose of the Study:

  • To quantitatively assess the range of motion to impingement with tripolar implants.
  • To compare the range of motion of tripolar implants with conventional implants.
  • To evaluate the stability benefits of tripolar implants in at-risk positions.

Main Methods:

  • Utilized an automated hip simulator to test tripolar implants.
  • Employed 22.2-mm and 28-mm femoral head sizes for tripolar implants.

Related Experiment Videos

  • Compared motion to impingement against a conventional 22.2-mm femoral head implant.

    • Main Results:

    • Tripolar implants demonstrated significant increases in flexion (30.5°), adduction (15.4°), and external rotation (22.4°).
    • Internal rotation increased by 45.2° at 90° hip flexion.
    • Extension increased by 18.8° and 7.8° at 0° and 30° external rotation, respectively, with bony impingement as the limit.

    Conclusions:

    • Tripolar implants significantly expand the range of motion before bony impingement.
    • These implants offer improved stability in positions vulnerable to dislocation.
    • Tripolar implants show promise for managing unstable total hip arthroplasties.