Probiotics: Can it modulate fracture healing?

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.