An approximate model for cancellous bone screw fixation |
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Authors: | C J Brown R A Sinclair A Day B Hess P Procter |
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Institution: | 1. School of Engineering and Design, Brunel University , Uxbridge , UB8 3PH , UK chris.brown@brunel.ac.uk;3. School of Engineering and Design, Brunel University , Uxbridge , UB8 3PH , UK;4. Brunel University, now IDAC Ltd , Airport House, Purley Way, Croydon , CR0 0XZ , UK;5. Stryker Osteosynthesis , Boetzingerstrasse 41, Freiburg , 79111 , Germany;6. School of Engineering and Design, Brunel University , Uxbridge , UB8 3PH , UK;7. Stryker Osteosynthesis , Le Lumion, Rue Francois Peyrot 12, CH-1218 , Grand Saconnex , Switzerland |
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Abstract: | This paper presents a finite element (FE) model to identify parameters that affect the performance of an improved cancellous bone screw fixation technique, and hence potentially improve fracture treatment. In cancellous bone of low apparent density, it can be difficult to achieve adequate screw fixation and hence provide stable fracture fixation that enables bone healing. Data from predictive FE models indicate that cements can have a significant potential to improve screw holding power in cancellous bone. These FE models are used to demonstrate the key parameters that determine pull-out strength in a variety of screw, bone and cement set-ups, and to compare the effectiveness of different configurations. The paper concludes that significant advantages, up to an order of magnitude, in screw pull-out strength in cancellous bone might be gained by the appropriate use of a currently approved calcium phosphate cement. |
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Keywords: | cancellous bone screw augmentation calcium phosphate cement finite element modelling screw fixation |
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