Engineering Multifunctional Hydrogel-Integrated 3D Printed Bioactive Prosthetic Interfaces for Osteoporotic...

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Regenerative Medicine

Background:

• 3D printed titanium implants face challenges like infection and loosening, especially in osteoporotic patients.
• Osteoporosis impairs bone marrow mesenchymal stem cells' (OP-BMSCs) autophagy, hindering osseointegration.
• Developing advanced orthopedic materials with antibacterial and autophagy-regulating properties is crucial.

Purpose of the Study:

• To engineer a multifunctional hydrogel-integrated 3D printed bioactive prosthetic interface for improved osseointegration in osteoporosis.
• To address the limitations of current orthopedic implants in osteoporotic bone environments.

Main Methods:

• Fabrication of a hydrogel from dynamic crosslinking of synthetic and natural polymers with silver nanowires.
• Incorporation of rapamycin for autophagy regulation and silver nanowires for antibacterial activity.
• In vitro and in vivo evaluation of the hydrogel-integrated implant's biocompatibility, antibacterial efficacy, and osseointegration in an osteoporotic model.

Main Results:

• The hydrogel exhibited antibacterial activity against S. aureus and MRSA, along with biocompatibility, degradability, conductivity, and self-healing properties.
• In vitro studies showed the implant restored OP-BMSC activity by upregulating autophagy.
• In vivo experiments demonstrated significantly improved osseointegration and reduced infection in the osteoporotic environment.

Conclusions:

• The developed multifunctional 3D printed bioactive prosthetic interfaces offer an effective strategy to enhance osseointegration and combat infection in osteoporotic patients.
• This approach holds promise for reducing complications associated with joint replacement arthroplasty in osteoporosis.
• The study highlights the potential of combining biomaterials engineering with drug delivery for advanced orthopedic applications.