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Poly(l-lactic acid)-based double-layer composite scaffold for bone tissue repair.

Yixing Ren1, Chunyang Ma2, Yao Yu2

  • 1Department of Joint Surgery, The Fourth Central Hospital of Baoding City, Baoding 072350, China.

Regenerative Biomaterials
|January 4, 2024
PubMed
Summary

This study developed a novel double-layer scaffold for bone repair. The scaffold effectively delivers Osteopractic total flavone (OTF) and Panax notoginseng saponin (PNS), significantly promoting new bone formation.

Keywords:
bone repaircontrolled releasedouble-layer scaffoldsmagnesiumpolylactic acid

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Drug Delivery Systems

Background:

  • Bone defects pose significant health challenges, requiring effective therapeutic strategies.
  • Osteopractic total flavone (OTF) promotes bone formation, while Panax notoginseng saponin (PNS) aids in blood circulation and stasis removal.
  • Poly(l-lactic acid) (PLLA) scaffolds offer a promising platform for delivering therapeutic agents to bone defect sites.

Purpose of the Study:

  • To design and characterize a double-layer PLLA scaffold loaded with OTF and PNS for enhanced bone repair.
  • To investigate the effect of Magnesium (Mg) particles on scaffold degradation and drug release kinetics.
  • To evaluate the in vivo efficacy of the drug-loaded scaffold in promoting new bone formation.

Main Methods:

  • Fabrication of a double-layer PLLA scaffold with inner OTF and outer PNS/Mg particle layers.
  • In vitro characterization of scaffold degradation, drug release profiles (PNS and OTF), and Mg content impact.
  • In vivo assessment of bone regeneration in rabbit bone defects using the developed scaffold.

Main Results:

  • The scaffold demonstrated controlled release of PNS and sustained release of OTF.
  • Increased Mg content accelerated scaffold degradation and drug release rates.
  • The scaffold with 5% Mg particles significantly enhanced new bone area and density in rabbit models compared to controls.

Conclusions:

  • The developed double-layer drug-loaded scaffold is a feasible and effective system for bone defect treatment.
  • The scaffold facilitates rapid release of PNS and continuous release of OTF, promoting bone healing.
  • The incorporation of Mg particles allows tunable degradation and drug release, optimizing therapeutic outcomes for bone regeneration.