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Pulsed Electromagnetic Fields Enhance Bone Morphogenetic Protein-2 Dependent-Bone Regeneration.

Hoon Joo Yang1, Ri Youn Kim2, Soon Jung Hwang1,2

  • 11 Department of Oral and Maxillofacial Surgery, Dental Research Institute, Seoul National University Dental Hospital, School of Dentistry, BK 21 Plus, Seoul National University , Seoul, Korea.

Tissue Engineering. Part A
|July 23, 2015
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Pulsed electromagnetic fields (PEMF) enhance bone regeneration with low-dose recombinant human bone morphogenetic protein-2 (rhBMP-2). PEMF promotes healing, especially when rhBMP-2 concentrations are reduced, mitigating side effects.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Surgery

Background:

  • Recombinant human bone morphogenetic protein-2 (rhBMP-2) shows promise for bone regeneration.
  • High rhBMP-2 doses in humans cause limitations like bone resorption and swelling.
  • Reducing rhBMP-2 dosage is crucial for safer and more effective bone regeneration therapies.

Purpose of the Study:

  • To evaluate the efficacy of pulsed electromagnetic fields (PEMF) in enhancing bone regeneration.
  • To determine if PEMF can reduce the required dose of rhBMP-2.
  • To investigate the combined effects of PEMF and varying rhBMP-2 concentrations on bone defect healing.

Main Methods:

  • A rat calvarial defect model (8-mm diameter) was used.
  • Collagen sponges with varying rhBMP-2 concentrations (0, 2.5, 5, 10 μg) were implanted.
  • PEMF was applied (8 h/day for 5 days) to experimental groups post-surgery.
  • Bone regeneration was assessed using microcomputed tomography, histology, and immunohistochemistry at 4 weeks.

Main Results:

  • rhBMP-2 concentration significantly influenced bone regeneration parameters (p < 0.001) without PEMF.
  • PEMF accelerated bone regeneration in groups receiving 0, 2.5, and 5 μg rhBMP-2 (p < 0.05).
  • The 10 μg rhBMP-2 group showed no additive benefit with PEMF; PEMF alone promoted central defect healing.
  • PEMF application with 5 and 10 μg rhBMP-2 resulted in denser bone and reduced dead spaces.

Conclusions:

  • Pulsed electromagnetic fields (PEMF) effectively promote bone regeneration.
  • PEMF allows for reduced concentrations of rhBMP-2, potentially minimizing adverse effects.
  • The combination of PEMF and low-dose rhBMP-2 offers a promising strategy for enhanced bone defect repair.