Gentamicin release from biodegradable poly-l-lactide based composites for novel intramedullary nails

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Infectious Disease Management

Background:

• Orthopedic implant-associated infections pose significant clinical challenges, requiring complex and prolonged treatments.
• Biodegradable antibiotic-eluting implants offer a promising strategy to prevent and manage these infections.
• Poly(L-lactide) based composites are being explored for their potential in drug delivery applications.

Purpose of the Study:

• To design and evaluate novel biodegradable intramedullary nails as antibiotic carriers.
• To investigate the influence of composite matrix modifications on drug release kinetics and antibacterial efficacy.
• To develop multifunctional implants for preventing orthopedic infections.

Main Methods:

• Fabrication of biodegradable intramedullary nails using a poly(L-lactide) matrix.
• Incorporation of gentamicin sulfate (GS) as the antibiotic payload.
• Reinforcement of the matrix with carbon fibers (CF), alginate fibers (Alg), and magnesium alloy wires (Mg).
• Modification with tricalcium phosphate (TCP) particles to create multi-phase composites.

Main Results:

• Successful development of novel, multi-phase, biodegradable intramedullary nails.
• Demonstrated a strong correlation between the type of modifying phase and the rate of gentamicin sulfate release.
• Introduction of gentamicin sulfate into the nail structure significantly enhanced and prolonged the antibacterial activity.

Conclusions:

• Biodegradable intramedullary nails incorporating gentamicin sulfate show potential for preventing orthopedic implant infections.
• The composite composition critically influences drug release profiles and sustained antibacterial action.
• These multifunctional implants represent a promising advancement in orthopedic infection management.