Dexamethasone eluting 3D printed metal devices for bone injuries

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Drug Delivery Systems

Background:

• Additively manufactured (3D printed) stainless steel implants are increasingly used in bone graft surgeries.
• Controlling inflammation post-surgery is crucial for successful bone healing.
• Drug-eluting implants offer a localized delivery method for therapeutic agents.

Purpose of the Study:

• To develop and characterize dexamethasone-coated 3D printed stainless steel implants.
• To evaluate the drug release profile of the coated implants.
• To assess the potential of these implants in preventing post-surgical inflammation.

Main Methods:

• Stainless steel implants were additively manufactured and surface-treated.
• Dexamethasone was coated onto implants using a gelatin-chondroitin sulfate polymer system via airbrush deposition.
• Polymer layers were cross-linked with glutaraldehyde.
• In vitro drug release studies were conducted over 3 days.

Main Results:

• The polymer coating achieved a thickness of 410 ± 5.2 μm.
• Drug content uniformity was high, within 100 ± 5%.
• In vitro release studies demonstrated a biphasic pattern: an initial burst release followed by sustained release up to 3 days.

Conclusions:

• The developed dexamethasone-eluting implants show promising characteristics for bone graft applications.
• The biphasic release profile suggests potential for sustained anti-inflammatory effects.
• Further in vivo studies in large animals (cattle, horses) are warranted to validate efficacy in preventing post-surgical inflammation.