The effects of rhBMP-2 injection at distraction osteogenesis of rats' tibia

Hae Ryong Song, Sung Eun Kim, Hyo Geun Kim, Young Pil Yun, Ji Hoon Bae, Hak Jun Kim

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Distraction osteogenesis is the popular method of bone-lengthening procedure. Delayed consolidation of bone after distraction osteogenesis makes complications related to external fixator and refractures after removal of external frame. We hypothesized that only rhBMP-2(recombinant human bone morphogenetic protein-2) could accelerate the long bone healing. 18 Sprague-Dawley rats were divided into two groups after 5 mm lengthening by distraction osteogenesis. The control group was none-injected group and the experimental group was injected 0.5 cc of 0.05 mg/ml rhBMP-2. We evaluated the 6 samples respectively at different time point (2, 4, 8 weeks) using simple radiographs, micro-CT and histological stains. According to the simple radiographs, bone consolidation of percentage pixel count was higher in the experimental group at 2, 4, 8 week, and statistically significant higher than the control group at 8 weeks (p < 0.05). Percentage bone Volume, trabecular thickness in the experimental group was higher than the control group by evaluation with micro-CT. According to the histological examinations, neovascularization and new stromal cells were observed in the control group at 2 week- speciemen but intramembranous ossification was seen at 2 week- specimens in the experimental group. Intramembranous and enchondral ossification was seen in the experimental group but not seen in the control group at the 4 week-specimens. Trabeculae thickness in the experimental group was thicker than the control group at 8-week specimens. Only local injection of rhBMP-2 at the distraction site could accelerate the bone healing during distraction osteogenesis.

Original languageEnglish
Pages (from-to)158-163
Number of pages6
JournalTissue Engineering and Regenerative Medicine
Volume8
Issue number2
Publication statusPublished - 2011 Mar 1

Keywords

  • Distraction osteogenesis
  • Rat
  • RhBMP-2

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Biomedical Engineering

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