Skeletal Radiology

, Volume 37, Issue 9, pp 843–847

Quantitative assessment of mineralization in distraction osteogenesis

Authors

  • Sunit Hazra
    • Department of Orthopedic SurgeryKorea University, Guro Hospital
    • Department of Orthopedic SurgeryRare Diseases Institute, Korea University, Guro Hospital
  • Sandeep Biswal
    • Department of Orthopedic SurgeryKorea University, Guro Hospital
  • Suk-Ha Lee
    • Department of OrthopedicsKonkuk University Hospital
  • Seok Hyun Lee
    • Department of Orthopedic SurgeryDongguk University International Hospital
  • Ki-Mo Jang
    • Department of Orthopedic SurgeryKorea University, Guro Hospital
  • Hitesh N. Modi
    • Department of Orthopedic SurgeryKorea University, Guro Hospital
Scientific Article

DOI: 10.1007/s00256-008-0495-7

Cite this article as:
Hazra, S., Song, H., Biswal, S. et al. Skeletal Radiol (2008) 37: 843. doi:10.1007/s00256-008-0495-7

Abstract

Objectives

The most important decision in distraction osteogenesis is the timing of fixator removal. Various methods have been tried, such as radiographic appearance of callus and bone mineral density (BMD) assessment, but none has acquired gold standard status. The purpose of this study was to develop another objective method of assessment of callus stiffness to help clinicians in taking the most important decision of when to remove the fixator.

Materials and methods

We made a retrospective study of 70 patients to compare the BMD ratio and pixel value ratio. These ratios were calculated at the time of fixator removal, and Pearson’s coefficient of correlation was used to show the comparability. Inter- and intra-observer variability of the new method was also tested.

Results

Good correlation was found between BMD ratio and pixel value ratio, with a Pearson’s coefficient of correlation of 0.79. The interobserver variability was also low, with high intra-observer reproducibility, suggesting that this test was simple to perform.

Conclusion

Pixel value ratio is a good method for assessing callus stiffness, and it can be used to judge the timing of fixator removal.

Keywords

Distraction osteogenesis BMD Callus stiffness Pixel Lengthening Ilizarov

Copyright information

© ISS 2008