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Related Experiment Videos

Acetabular component deformation with press-fit fixation.

Matthew Squire1, William L Griffin, J Bohannon Mason

  • 1Department of Orthopedics and Rehabilitation, University of Wisconsin Hospitals and Clinics, Madison, Wisconsin, USA.

The Journal of Arthroplasty
|September 5, 2006
PubMed
Summary
This summary is machine-generated.

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Press-fit acetabular cups can deform during hip arthroplasty insertion. This deformation, observed in 90.5% of Pinnacle 100 cups, indicates significant in vivo forces that may lead to clinical issues with hard-on-hard bearing surfaces.

Area of Science:

  • Orthopedic surgery
  • Biomechanical engineering
  • Materials science

Background:

  • Press-fit acetabular cups are commonly used in hip arthroplasty.
  • Component deformation during insertion is a potential risk.
  • Understanding in vivo forces is crucial for implant longevity.

Purpose of the Study:

  • To characterize the stiffness of Pinnacle 100 acetabular cups.
  • To calculate in vivo forces acting on these cups during hip arthroplasty.
  • To assess the clinical implications of acetabular component deformation.

Main Methods:

  • Mechanical testing of Pinnacle 100 cups to determine stiffness.
  • Intraoperative measurement of cup deformation in 21 hip arthroplasty patients.
  • Calculation of in vivo forces based on stiffness and deformation data.

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Main Results:

  • 90.5% of implanted cups exhibited measurable compression deformity.
  • Average cup deformity was 0.16 +/- 0.16 mm.
  • Average calculated in vivo forces were 414 +/- 421 N.

Conclusions:

  • Significant in vivo forces are generated during press-fit acetabular cup insertion.
  • Deformation of acetabular shells can occur, potentially leading to adverse clinical outcomes.
  • Equatorial loading, increased wear, component seizing, ceramic chipping, and locking mechanism damage are potential consequences, especially with hard-on-hard bearing surfaces.