The dynamic volume changes of polymerising polymethyl methacrylate bone cement

Muller, Scott D. and Green, Sarah M. and McCaskie, Andrew W. (2002) The dynamic volume changes of polymerising polymethyl methacrylate bone cement. Acta Orthopaedica Scandinavica, 73 (6). pp. 684-687. ISSN 0001-6470

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The Swedish hip register found an increased risk of early revision of vacuum-mixed cemented total hip replacements. The influence of cement mixing technique on the dynamic volume change in polymerising PMMA is not well understood and may be relevant to this observation. Applying Archimedes' principle, we have investigated the dynamic volume changes in polymerising cement and determined the influence of mixing technique. All specimens showed an overall volume reduction: hand-mixed 3.4% and vacuum-mixed 6.0%. Regression analysis of sectional porosity and volume reduction showed a highly significant relationship. Hand-mixed porous cement showed a transient volume increase before solidification. However, vacuum-mixed cement showed a progressive volume reduction throughout polymerisation. Transient expansion of porous cement occurs at the critical time of micro-interlock formation, possibly improving fixation. Conversely, progressive volume reduction of vacuum-mixed cement throughout the formation of interlock may damage fixation. Stable fixation of vacuum-mixed cement may depend on additional techniques to offset the altered volumetric behaviour of vacuum-mixed cement.

Item Type:
Journal Article
Journal or Publication Title:
Acta Orthopaedica Scandinavica
Uncontrolled Keywords:
?? engineeringorthopedics and sports medicinesurgeryta engineering (general). civil engineering (general) ??
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Deposited On:
17 Oct 2012 08:32
Last Modified:
15 Jul 2024 13:12