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Related Experiment Videos

Constrained acetabular cups: a cadaveric biomechanical evaluation.

Terry A Clyburn1, Amanda Weitz-Marshall, Catherine G Ambrose

  • 1Department of Orthopaedics, University of Texas-Houston Medical School, Houston, Texas 77030, USA.

The Journal of Arthroplasty
|June 24, 2003
PubMed
Summary
This summary is machine-generated.

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Constrained acetabular cups offer functional range of motion but limit extension. Recommended anteversion is <10 degrees to prevent hip dislocation, which occurs at the ball-polyethylene interface.

Area of Science:

  • Orthopedic biomechanics
  • Total hip arthroplasty

Background:

  • Constrained acetabular cups are used in hip replacements to prevent dislocation.
  • Concerns exist regarding their impact on range of motion and potential for failure.

Purpose of the Study:

  • To biomechanically evaluate the range of motion and dislocation characteristics of constrained acetabular cups.
  • To determine the torque and rotational forces required to dislocate hips with these implants.

Main Methods:

  • Six constrained acetabular cups from two manufacturers were implanted in cadaver pelves.
  • Range of motion was measured using a custom jig.
  • Torque and rotation to dislocation were quantified.

Main Results:

  • All cup positions demonstrated functional range of motion, with extension limited to 0 degrees.

Related Experiment Videos

  • Anteversion ranged from 11 to 29 degrees; <10 degrees is recommended.
  • Dislocation occurred at 7-11 ft-pounds and 72-82 degrees of rotation, varying by manufacturer.
  • Subsequent dislocations required reduced torque.

    • Conclusions:

    • Constrained acetabular cups allow functional motion but necessitate specific anteversion angles (<10 degrees) to minimize dislocation risk.
    • Dislocations happen at the ball-polyethylene interface without catastrophic cup failure.
    • Polyethylene liner replacement is advised following dislocation events.