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Related Concept Videos

Fractures: Bone Repair01:27

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Treatment for a fracture is based on the type of break, the bone affected, and the patient's age.
Minor fractures with no bone displacement are treated by immobilizing the fractured bone using a cast or splint. However, in the case of fractures with displaced bones, the broken bones are repositioned before immobilization to ensure successful healing without deformation and loss of function. The realignment of fractured bone ends is performed through a process called reduction. If the...
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Bone Remodeling01:40

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Related Experiment Video

Updated: Jul 17, 2025

Assessment of Bone Fracture Healing Using Micro-Computed Tomography
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Probiotics: Can it modulate fracture healing?

Yufa Wang1,2, Aouod Agenor1,2, Allison Clement1,2

  • 1Sunnybrook Research Institute, Toronto, ON, Canada.

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Oral probiotics given before fracture significantly enhanced bone healing markers and biomechanical properties in mice. Post-fracture probiotic treatment showed some benefits but was less effective for improving bone healing.

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Area of Science:

  • Orthopedics
  • Microbiology
  • Immunology

Background:

  • Fractures significantly impair function and productivity.
  • Gut microbiota influences host physiology, including bone metabolism.
  • Optimizing fracture healing is crucial for patient recovery.

Purpose of the Study:

  • To investigate the impact of oral probiotic treatment on bone healing after fracture.
  • To assess changes in cytokines and bone biomarkers following probiotic administration.
  • To evaluate the effect of probiotics on the biomechanical properties of healed bone.

Main Methods:

  • C57BL/6 mice underwent femoral osteotomy and intramedullary pinning.
  • Probiotic or control treatment was administered orally either before (5 weeks) or after (4 weeks) fracture.
  • Gene expression of osteogenic cytokines and biomarkers was analyzed via RT-qPCR.
  • Microstructural analysis (μCT) and biomechanical testing (torsion) assessed healed femurs.

Main Results:

  • Pre-fracture probiotic treatment increased key cytokines (TGF-β, IL-6, IL-17F) and bone markers (Col1, Runx2).
  • Significant improvements in bone volume, density, torque, stiffness, and strain energy were observed with pre-fracture treatment.
  • Post-fracture treatment showed no significant changes in gene expression or microarchitecture but improved some failure biomechanics.

Conclusions:

  • Oral probiotics administered before fracture enhance bone healing and biomechanical strength.
  • Probiotic use may offer a low-risk, cost-effective adjunctive therapy for fracture healing.
  • Timing of probiotic administration is critical for optimizing bone healing outcomes.