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A novel liposomal drug delivery system for PMMA bone cements

Nishio Ayre, Wayne ORCID:, Birchall, James C. ORCID:, Evans, Samuel L. ORCID: and Denyer, Stephen P. 2016. A novel liposomal drug delivery system for PMMA bone cements. Journal of Biomedical Materials Research Part B: Applied Biomaterials 104 (8) , pp. 1510-1524. 10.1002/jbm.b.33488

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The population in developed countries is ageing and the number of people experiencing joint-related conditions, such as osteoarthritis, is expected to increase. Joint replacements are currently the most effective treatment for severe joint conditions and although many of these procedures are successful, infection developing after the procedure is still an issue, requiring complex and expensive revisions. Whilst incorporating a powdered antibiotic within the bone cement can reduce infection rates, the powder frequently agglomerates, resulting in poor antibiotic release characteristics and compromised mechanical performance of the cement. To overcome these issues, a novel delivery system consisting of antibiotic-loaded nano-sized liposomes was developed for inclusion into polymethyl methacrylate (PMMA) bone cement. This system was tested in a commercial cement (Palacos R) and consistently delivered a higher percentage (22%) of the incorporated antibiotic when compared to the powdered antibiotic cement (9%), meaning less antibiotic needs to be incorporated than with conventional cement. The novel system resulted in a controlled and gradual release of antibiotic over a longer, 30-day period and enhanced the toughness, bending strength and Vickers hardness of the cement, without altering its polymerization or molecular structure. This new material has the potential to significantly reduce infections in cemented joint replacements leading to enhanced patient quality of life and reduced healthcare costs.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Dentistry
Additional Information: This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Publisher: Wiley
ISSN: 1552-4973
Funders: Arthritis Research UK
Date of First Compliant Deposit: 30 March 2016
Date of Acceptance: 18 July 2015
Last Modified: 07 May 2023 08:30

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