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A bench-top method for evaluating modular total hip component combinations.

R L Uhl1, S C Williamson, R Williams

  • 1Division of Orthopaedic Surgery, Albany Medical College, New York, USA.

American Journal of Orthopedics (Belle Mead, N.J.)
|April 28, 2000
PubMed
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Modular hip implants can dislocate due to component combinations. Specific parts like skirted necks and smaller heads increase impingement risk, reducing range of motion and potentially causing dislocation.

Area of Science:

  • Orthopedic Surgery
  • Biomedical Engineering
  • Materials Science

Background:

  • Modular total hip prostheses offer surgical flexibility.
  • Component combinations can lead to impingement and dislocation.
  • Understanding these risks is crucial for patient safety.

Purpose of the Study:

  • To evaluate the risk of impingement and dislocation with different modular hip prosthesis configurations.
  • To quantify the range of motion reduction caused by specific component combinations.
  • To develop a bench-top model for testing modular hip implant stability.

Main Methods:

  • A bench-top model was used to test two modular total hip systems from different manufacturers.
  • Various combinations of head size, neck length, and acetabular liner types were analyzed.

Related Experiment Videos

  • Femoral component travel before impingement and dislocation was measured.

    • Main Results:

    • Certain components, including skirted necks, smaller heads, and lipped liners, increased impingement and dislocation risk.
    • The risk associated with these components was additive.
    • A combination of a small head, skirted neck, and lipped liner reduced range of motion by up to 18 degrees.

    Conclusions:

    • Specific modular component choices can significantly compromise hip prosthesis stability.
    • The additive effect of certain components necessitates careful selection to avoid impingement and dislocation.
    • The developed testing method can assess various modular configurations for improved implant design and surgical guidance.