Biological Augmentation Using Electrospun Constructs with Dual Growth Factor Release for Rotator Cuff Repair

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Regenerative Medicine

Background:

• Rotator cuff tears (RCT) have high retear rates (up to 94%) after surgical repair due to poor tendon-bone healing.
• Current surgical methods struggle with successful enthesis regeneration, limiting functional recovery.
• Biomaterial augmentation offers a promising strategy to enhance rotator cuff repair outcomes.

Purpose of the Study:

• To develop and evaluate a bilayer biomaterial construct for enhanced tendon-bone healing in rotator cuff repair.
• To investigate the synergistic effects of dual growth factors (BMP2 and BMP12) delivered via a polydopamine-functionalized scaffold.
• To improve the regenerative potential of the tendon-bone interface and reduce retear rates.

Main Methods:

• Fabrication of a bilayer scaffold using poly(lactic-co-glycolic acid) (PLGA) fibers.
• Immobilization of bone morphogenetic protein 2 (BMP2) and BMP12 onto separate scaffold layers using polydopamine (PDA) mediation.
• In vitro assessment of osteoblast and tenocyte responses and in vivo evaluation using a rat rotator cuff tear model.

Main Results:

• The BMP2-loaded layer significantly promoted osteoblast proliferation and function.
• The BMP12-loaded layer enhanced tenocyte viability, differentiation, and fibrocartilage formation.
• In vivo studies demonstrated significant improvement in tendon-bone healing, biomechanical strength, and tissue regeneration compared to controls.

Conclusions:

• A dual-growth factor releasing bilayer scaffold effectively promotes tendon-bone enthesis regeneration.
• This combinational biomaterial strategy significantly enhances rotator cuff repair in an in vivo model.
• The developed augmentation patch shows potential for improving clinical outcomes in rotator cuff surgery.