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Injectable calcium phosphate cement for augmentation around cancellous bone screws: In vivo biomechanical studies
Uppsala University, Disciplinary Domain of Medicine and Pharmacy, Faculty of Medicine, Department of Surgical Sciences, Orthopaedics.
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2012 (English)In: Journal of Biomechanics, ISSN 0021-9290, E-ISSN 1873-2380, Vol. 45, no 7, 1156-1160 p.Article in journal (Refereed) Published
Abstract [en]

In lower cancellous apparent bone density, it can be difficult to achieve adequate screw fixation and hence stable fracture fixation. Different strategies have been proposed, one of them is through augmentation using calcium phosphate cement in the region at or close to the screw thread itself. To support the hypothesis of an improved screw fixation technique by augmentation of the bone surrounding the implanted screw, in vivo biomechanical and densitometric studies are performed on rabbit specimen where normal and simulated weak bone quality are considered. In particular, the evolution of screw stability till 12 weeks following the implantation is quantified. A statistical significance in the pull out force for augmented versus non-augmented screws was found for the shorter time periods tested of <= 5 days whilst the pull out force was found to increase with time for both augmented and non-augmented screws during the 12 week course of the study. The results of the study demonstrate that the use of an injectable calcium phosphate cement which sets in vivo can significantly improve screw pull out strength at and after implantation for normal and simulated weak bone quality.

Place, publisher, year, edition, pages
2012. Vol. 45, no 7, 1156-1160 p.
Keyword [en]
Cancellous bone screw, Augmentation, Calcium phosphate cement, Pull out, In vivo testing
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-175210DOI: 10.1016/j.jbiomech.2012.02.004ISI: 000303627500005OAI: oai:DiVA.org:uu-175210DiVA: diva2:530952
Available from: 2012-06-05 Created: 2012-06-04 Last updated: 2012-06-05Bibliographically approved

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