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Platelet-rich plasma and bone defect healing.

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Platelet-rich plasma (PRP) combined with bone graft substitutes enhances bone regeneration. This study found PRP dose-dependently increases bone augmentation when used with biphasic calcium phosphate in sheep.

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Area of Science:

  • Orthopedics
  • Regenerative Medicine
  • Biomaterials Science

Background:

  • Platelet-rich plasma (PRP) contains growth factors crucial for bone regeneration.
  • Combining PRP with bone graft substitutes offers an alternative to autografts.
  • Inconsistent outcomes in PRP research highlight the need for dose standardization.

Purpose of the Study:

  • To investigate the dose-dependent effect of autologous thrombin-activated PRP on bone augmentation.
  • To compare PRP combined with biphasic calcium phosphate (BCP) against BCP alone, autografts, and empty defects.

Main Methods:

  • Eighty critical-sized bone defects were created in 20 sheep.
  • Defects were treated with three doses of PRP + BCP, autograft, or left empty.
  • Evaluations included radiography, micro-CT, histology, histomorphometry, and bone labels at 4 weeks.

Main Results:

  • Empty defects showed no spontaneous healing.
  • The highest PRP dose significantly increased bone volume/total volume compared to BCP alone (30.6% vs. 24.5%).
  • All PRP doses significantly improved new bone area and ingrowth depth compared to BCP alone.

Conclusions:

  • PRP promotes new bone formation in a dose-dependent manner when combined with BCP in sheep.
  • PRP shows significant bone ingrowth effects compared to BCP alone.
  • Autografts demonstrated the highest bone formation based on fluorescent labeling.