Augmenting osteoporotic osseointegration through a temporal release nanocoating-based reversing dysregulated...

Area of Science:

• Biomaterials Science
• Orthopedic Engineering
• Nanotechnology

Background:

• Osteoporosis impairs osseointegration, leading to prosthesis loosening and fractures.
• Imbalances in the bone microenvironment contribute to poor implant integration.
• Novel strategies are needed to enhance prosthesis stability in osteoporotic patients.

Purpose of the Study:

• To engineer a novel bioinspired interface for 3D-printed titanium implants.
• To develop a nanocoating for sustained release of zoledronic acid (ZOL).
• To investigate the effect of ZOL-eluting nanocoatings on osseointegration in an osteoporotic model.

Main Methods:

• Fabrication of a 3D-printed porous titanium alloy implant with a hollow mesoporous silica nanoparticle coating.
• Amine-functionalization of the nanocoating for ZOL loading and temporal release.
• In vitro characterization of the bioactive interface and ZOL release kinetics.
• In vivo evaluation of osseointegration in an osteoporotic animal model.

Main Results:

• Efficient ZOL loading and sustained release via diffusion and ionization were achieved.
• Early high-concentration ZOL release inhibited osteoclast activity, followed by bone formation promotion.
• An optimal ZOL concentration (10^-5 M) demonstrated bidirectional regulation of the osteogenic-osteoclastic balance.
• The ZOL-loaded spatial gradient interface significantly improved osseointegration in vivo.

Conclusions:

• A novel nanocoating with a temporal ZOL release mechanism was successfully developed.
• This approach effectively reverses the dysregulated osteogenic microenvironment in osteoporosis.
• The engineered interface enhances osseointegration and offers a potential solution for prosthesis stability in osteoporotic patients.