Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10081643 | The Journal of Arthroplasty | 2005 | 7 Pages |
Abstract
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.
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Authors
William L. MBBS, Jonathan Clabeaux, Timothy M. PhD, William PhD, William K. MBBS, Thomas P. MD,