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The Bone & Joint Journal

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The Journal of Bone & Joint Surgery British Volume
Vol. 87-B, Issue 9 | Pages 1298 - 1302
1 Sep 2005
Iesaka K Jaffe WL Jones CM Kummer FJ

We have investigated the role of the penetration of saline on the shear strength of the cement-stem interface for stems inserted at room temperature and those preheated to 37°C using a variety of commercial bone cements. Immersion in saline for two weeks at 37°C reduced interfacial strength by 56% to 88% after insertion at room temperature and by 28% to 49% after preheating of the stem. The reduction in porosity as a result of preheating ranged from 71% to 100%. Increased porosity correlated with a reduction in shear strength after immersion in saline (r = 0.839, p < 0.01) indicating that interfacial porosity may act as a fluid conduit.