Porous Structures, Surface Modifications, and Smart Technologies for Total Ankle Arthroplasty: A Narrative Review

Area of Science:

• Biomaterials Science
• Orthopedic Surgery
• Biomedical Engineering

Background:

• Total ankle arthroplasty (TAA) implant development is advancing through surface engineering and architectural design.
• Biointegration strategies are crucial for successful TAA, focusing on porous structures, surface modifications, and smart technologies.

Purpose of the Study:

• To review current biointegration strategies in TAA implant development.
• To explore porous architectures, surface modifications, and emerging technologies for enhanced TAA.
• To highlight the potential of these innovations to establish TAA as a viable alternative to arthrodesis.

Main Methods:

• Narrative review of scientific literature on TAA surface engineering and biointegration.
• Analysis of porous structures, surface modification techniques (bioactive, topographical, antimicrobial, wear-resistant), and smart technologies.
• Examination of multifunctional approaches and emerging innovations like biodegradable scaffolds and sensor systems.

Main Results:

• Optimal porous architectures (300-600 µm) promote bone ingrowth and osseointegration.
• Surface modifications include bioactive coatings, nanotexturing, antimicrobial agents, and wear-resistant technologies.
• Emerging technologies like smart sensors and biomimetic nanotechnology show future potential for TAA.

Conclusions:

• Integrated surface engineering is essential for TAA implants, considering the ankle's biomechanical and biological demands.
• Multifunctional approaches can simultaneously address infection, osseointegration, and wear resistance.
• Innovations in TAA surface engineering and design hold promise for improving functional restoration and establishing TAA as a superior alternative to arthrodesis.