Three-dimensional printed polylactic acid scaffold integrated with BMP-2 laden hydrogel for precise bone regeneration

Area of Science:

• Biomaterials Engineering
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Critical bone defects pose significant clinical challenges, necessitating advanced regenerative strategies.
• Three-dimensional (3D) printing offers customizable scaffolds for bone tissue engineering.
• Bone morphogenetic protein 2 (BMP-2) is a key growth factor for bone regeneration.

Purpose of the Study:

• To evaluate a novel 3D printed polylactic acid (PLA) cage/Biogel scaffold as a carrier for BMP-2.
• To assess the efficacy of this system in promoting bone regeneration in rat calvarial and ectopic ossification models.

Main Methods:

• Fabrication of PLA cage scaffolds using 3D printing technology.
• Incorporation of gelatin and alginate-based Biogel with BMP-2 into the PLA scaffolds.
• In vitro release studies and in vivo testing in rat models.

Main Results:

• The scaffold demonstrated sustained release of BMP-2 with maintained osteoinductivity for over 14 days.
• The PLA/Biogel/BMP-2 group exhibited superior bone regeneration in both calvarial defect and ectopic ossification models.
• The scaffold effectively controlled the shape of regenerated bone in the ectopic ossification model.

Conclusions:

• The 3D printed PLA cage/Biogel scaffold is a suitable delivery system for BMP-2.
• This system significantly enhances bone regeneration and guides bone formation according to the scaffold's design.