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Lookup NU author(s): Professor Andrew McCaskie, Dr Scott Muller
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Fatigue fractures which originate at stress-concentrating voids located at the implant-cement interface are a potential cause of septic loosening of cemented femoral components. Heating of the component to 44°C is known to reduce the porosity of the cement-prosthesis interface. The temperature of the cement-bone interface was recorded intra-operatively as 32.3°C. A simulated femoral model was devised to study the effect of heating of the component on the implant-cement interface. Heating of the implant and vacuum mixing have a synergistic effect on the porosity of the implant-cement interface, and heating also reverses the gradients of microhardness in the mantle. Heating of the implant also reduces porosity at the interface depending on the temperature. A minimum difference in temperature between the implant and the bone of 3°C was required to produce this effect. The optimal difference was 7°C, representing a balance between maximal reduction of porosity and an increased risk of thermal injury. Using contemporary cementing techniques, heating the implant to 40°C is recommended to produce an optimum effect. © 2004 British Editorial Society of Bone and Joint Surgery.
Author(s): Jafri AA, Green SM, Partington PF, McCaskie AW, Muller SD
Publication type: Article
Publication status: Published
Journal: Journal of Bone and Joint Surgery - British Volume
Year: 2004
Volume: 86-B
Issue: 8
Pages: 1214-1219
ISSN (print): 0301-620X
ISSN (electronic): 2044-5377
Publisher: British Editorial Society of Bone and Joint Surgery
URL: http://dx.doi.org/10.1302/0301-620X.86B8.14660
DOI: 10.1302/0301-620X.86B8.14660
PubMed id: 15568540
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