Mechanisms for pumping fluid through cementless acetabular components with holes |
| |
Authors: | Walter William L Clabeaux Jonathan Wright Timothy M Walsh William Walter William K Sculco Thomas P |
| |
Institution: | Hospital for Special Surgery, New York, New York, USA. |
| |
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. |
| |
Keywords: | polyethylene acetabular component holes pumping |
本文献已被 ScienceDirect PubMed 等数据库收录! |