Influence of cement compressive strength and porosity on augmentation performance in a model of orthopedic screw pull-out

Journal of the Mechanical Behavior of Biomedical Materials
Michael Pujari-PalmerHåkan Engqvist

Abstract

Disease and injuries that affect the skeletal system may require surgical intervention and internal fixation, i.e. orthopedic plate and screw insertion, to stabilize the injury and facilitate tissue repair. If the surrounding bone quality is poor the screws may migrate, or the bone may fail, resulting in fixation failure. While numerous studies have shown that cement augmentation of the interface between bone and implant can increase screw pull-out force, the physical properties of cement that influence pull-out force have not been investigated. The present study sought to determine how the physical properties of high strength calcium phosphate cements (hsCPCs, specifically dicalcium phosphate) affected the corresponding orthopedic screw pull-out force in urethane foam models of "healthy" and "osteoporotic" synthetic bone (Sawbones). In the simplest model, where only the bond strength between screw thread and cement (without Sawbone) was tested, the correlation between pull-out force and cement compressive strength (R2 = 0.79) was weaker than correlation with total cement porosity (R2 = 0.89). In open pore Sawbone that mimics "healthy" cancellous bone density the stronger cements produced higher pull-out force (50-60% increase)...Continue Reading

Citations

Jun 26, 2018·Advanced Healthcare Materials·Alina KirillovaKen Gall
Aug 2, 2018·Journal of Materials Science. Materials in Medicine·Andrea De PieriYves Bayon
Oct 29, 2020·Advanced Healthcare Materials·Alina KirillovaKen Gall
Jan 23, 2021·Journal of Functional Biomaterials·Céline RoboCecilia Persson
Feb 25, 2020·Journal of the Mechanical Behavior of Biomedical Materials·Dan WuCecilia Persson
Sep 20, 2021·Orthopaedics & Traumatology, Surgery & Research : OTSR·Khanin IamthanapornVarah Yuenyongviwat

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