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The Effect of Microcurrent Stimulation on Expression of BMP-4 After Tibia Fracture in Rabbits

미세전류가 토끼 경골의 골절 후 BMP-4 발현에 미치는 영향

  • Received : 2009.08.26
  • Accepted : 2009.10.21
  • Published : 2010.03.28

Abstract

This study aimed to examine the effect of microcurrent stimulation on expression of Bone Morphogenetic Protein(BMP) 4 after tibia fracture in rabbits. The twenty four adult 6 month old New Zealand white rabbits weighting 2.5~3.5 ㎏ were used. Twenty four rabbits with tibia fracture were randomly divided into control and experimental groups. Each group was divided into four subgroups, based on the duration of the experiment (3, 7, 14, 28 days). The experimental groups received microcurrent stimulation of 20~25 ${\mu}A$ intensity with surface Ag-AgCl electrode (diameter 1cm, Biopac, U.S.A.) for 24 hours a day. Cathode of the microcurrent stimulator located on the tibia directly, anode of it did on the gastrocnemius muscle. After evaluation, the test results are as follows: Comparisons of immunohistochemical observation of BMP-4 in 7 days after tibial fracture show that there was shown to be a moderate positive reaction (++) on concentric circles of Harversian system and the interstitial lamella in the control group, while there was a very strong positive reaction () on concentric circles of Harversian system and interstitial lamellain the experimental group. These results suggest that applying non-invasive constant microcurrent stimulation on fractured bone is helpful to bone healing.

Keywords

BMP-4;Microcurrent Stimulation;Tibia Fracture

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