Mechanisms for pumping fluid through cementless acetabular components with holes Academic Article uri icon


MeSH Major

  • Hip Joint
  • Hip Prosthesis
  • Osteolysis


  • The pumping of fluid and polyethylene wear debris from the joint space to the retroacetabular bone is implicated in the pathogenesis of osteolysis. Three possible mechanisms for this pumping: pressure gradients, diaphragm pumping, and piston pumping were studied in vitro in a laboratory model. The simulated activities of rising from a chair and climbing stairs produced high-pressure gradients and high angles of loading that could pump fluid through the apical hole to the retroacetabular bone. A noncongruent liner acted as a diaphragm pump, producing pressures 6 times higher than that seen with a congruent liner. Pistoning motion of the liner produced pressures 8 times higher than when no pistoning occurs. These pumping mechanisms could be mitigated by the use of acetabular components without holes.

publication date

  • December 2005



  • Academic Article



  • eng

Digital Object Identifier (DOI)

  • 10.1016/j.arth.2005.03.039

PubMed ID

  • 16376261

Additional Document Info

start page

  • 1042

end page

  • 8


  • 20


  • 8