title: An approximate model for cancellous bone screw fixation.
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.
authors.affiliation: School of Engineering and Design, Brunel University, Uxbridge, UB8 3PH, UK. chris.brown@brunel.ac.uk
authors.forename: C J
authors.initials: CJ
authors.lastname: Brown
authors.forename: R A
authors.initials: RA
authors.lastname: Sinclair
authors.forename: A
authors.initials: A
authors.lastname: Day
authors.forename: B
authors.initials: B
authors.lastname: Hess
authors.forename: P
authors.initials: P
authors.lastname: Procter
mesh_terms: D001843:Bone Cements; D001863:Bone Screws; D001842:Bone and Bones / Q000033:anatomy & histology; D002130:Calcium Phosphates; D003198:Computer Simulation; D020342:Finite Element Analysis; D005592:Fracture Fixation
chemical_list: D001843:Bone Cements; D002130:Calcium Phosphates; C020243:calcium phosphate