Intramedullary femoral nails: one or two lag screws? A preliminary study

Wang, C J, Brown, C J, Yettram, A L and Procter, P (2000) Intramedullary femoral nails: one or two lag screws? A preliminary study. Medical Engineering and Physics, 22 (9). pp. 613-624. ISSN 1350-4533

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Abstract

Failures of proximal femoral nails that treat unstable femoral fractures have been reported. In this communication, a finite element model to include a proximal femoral nail within a fractured femur was used to carry out preliminary investigations into configurations of single or double lag screws. The effects of the different types of fracture were investigated. The results show that in order to share the load evenly between two lag screws, a good configuration seems to be to have a slightly larger screw above the lower screw. This also ameliorates stresses in the nail at the lag screw insertion holes. However, using two screws in this way can lead to large stresses in the cancellous bone in the femoral head, and these stresses may be significant in the initiation of cut-out.

Item Type: Article
Schools and Departments: School of Engineering and Informatics > Engineering and Design
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
Depositing User: Chang Wang
Date Deposited: 03 Oct 2013 14:55
Last Modified: 03 Oct 2013 14:55
URI: http://sro.sussex.ac.uk/id/eprint/46524
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