PMID: 15348656Sep 7, 2004Paper

Bone cement or bone substitute augmentation of pedicle screws improves pullout strength in posterior spinal fixation

Journal of Materials Science. Materials in Medicine
S L EvansS Ahuja

Abstract

Pedicle screws are widely used to fix posterior spinal implants. However, in some situations, such as at the ends of long constructs in scoliosis correction, the screws may pull out of the pedicles. This limits the use of pedicle screw fixation where bone quality is poor. The aim of this study was to investigate the effect of using either a low-viscosity bone cement (Palacos LV) or a bone augmentation material (Cortoss) on the pullout strength of typical pedicle screws (5 mm USS Schanz screws). Ten lumbar calf vertebrae were implanted with pedicle screws. One screw was inserted as normal, and the contralateral screw was augmented with Palacos LV or Cortoss. A plate was then cemented to the posterior surface of each pedicle and the screws were pulled out using a tensile testing machine. The pullout strength of the non-augmented screws was 1203+/-260 N, while the pullout strength of the augmented screws was 1970+/-220 N (Palacos LV) and 2021+/-342 N (Cortoss). Both Palacos LV and Cortoss significantly increased the pullout strength (p=0.0213 and p=0.0029, respectively). There was no significant difference between the Palacos LV and Cortoss groups (p=0.79).

Citations

Jun 15, 2007·Journal of Materials Science. Materials in Medicine·Ahmed Mansour BalloTimo O Närhi
Nov 1, 2007·Journal of Spinal Disorders & Techniques·Tomoyuki TakigawaToshifumi Ozaki
Apr 26, 2008·Journal of Materials Science. Materials in Medicine·Ahmed Mansour BalloTimo O Narhi
Nov 9, 2010·Journal of Dental Research·A M BalloP K Vallittu
May 16, 2015·Journal of Biomedical Materials Research. Part B, Applied Biomaterials·Yaoyao LiuFei Dai
Jan 18, 2017·Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine·Mehmet Fatih AycanYusuf Usta
Jan 25, 2008·The Journal of Craniofacial Surgery·Galip Zihni SanusFatma Ozlen
Dec 24, 2020·European Spine Journal : Official Publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society·Hans-Joachim RiesnerHans-Joachim Wilke
Aug 7, 2010·Acta Biomaterialia·Johan Van der StokPeter Patka

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