In Vivo MicroCT Monitoring of Osteomyelitis in a Rat ModelReport as inadecuate

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BioMed Research International - Volume 2015 2015, Article ID 587857, 12 pages -

Research ArticleAO Research Institute Davos, Clavadelerstrasse 8, 7270 Davos-Platz, Switzerland

Received 28 August 2014; Accepted 30 October 2014

Academic Editor: Yuhan Chang

Copyright © 2015 Vincent A. Stadelmann et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Infection associated with orthopedic implants often results in bone loss and requires surgical removal of the implant. The aim of this study was to evaluate morphological changes of bone adjacent to a bacteria-colonized implant, with the aim of identifying temporal patterns that are characteristic of infection. In an in vivo study with rats, bone changes were assessed using in vivo microCT at 7 time points during a one-month postoperative period. The rats received either a sterile or Staphylococcus aureus-colonized polyetheretherketone screw in the tibia. Bone-implant contact, bone fraction, and bone changes quiescent, resorbed, and new bone were calculated from consecutive scans and validated against histomorphometry. The screw pullout strength was estimated from FE models and the results were validated against mechanical testing. In the sterile group, bone-implant contact, bone fraction, and mechanical fixation increased steadily until day 14 and then plateaued. In the infected group, they decreased rapidly. Bone formation was reduced while resorption was increased, with maximum effects observed within 6 days. In summary, the model presented is capable of evaluating the patterns of bone changes due to implant-related infections. The combined use of longitudinal in vivo microCT imaging and image-based finite element analysis provides characteristic signs of infection within 6 days.

Author: Vincent A. Stadelmann, Inga Potapova, Karin Camenisch, Dirk Nehrbass, R. Geoff Richards, and T. Fintan Moriarty



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