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Journal of Bone and Joint Surgery - British Volume, Vol 87-B, Issue 9, 1298-1302.
doi: 10.1302/0301-620X.87B9.15404  
Copyright © 2005 by British Editorial Society of Bone and Joint Surgery
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The effects of fluid penetration and interfacial porosity on the fixation of cemented femoral components

K. Iesaka, MD, Orthopaedic Research Fellow1; W. L. Jaffe, MD, Orthopaedic Surgeon, Clinical Professor2; C. M. Jones, MD, Orthopaedic Resident3; and F. J. Kummer, PhD, Associate Director1

1 Musculoskeletal Research Center
2 Department of Orthopaedic Surgery, New York University Hospital for Joint Diseases, 301 E 17th Street, New York, 10003, USA.
3 University of Miami School of Medicine, Jackson Memorial Hospital, 1611 N. W. 12th Avenue, Miami, Florida 33136-1094, USA.

Correspondence should be sent to Dr K. Iesaka; e-mail: kazuho{at}biomech.org

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.




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Hip, Knee, Trauma, Upper limb, Foot & Ankle, Paediatrics, Oncology, Spine, Arthroplasty, General