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Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo
Published on: July 1, 2013
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Bioactive macroporous titanium implants highly interconnected
Cristina Caparrós1,2, Mónica Ortiz-Hernandez1,2, Meritxell Molmeneu1,2
1Biomaterials, Biomecànica i Enginyeria de Teixits Department, de Ciència dels Materials i Enginyeria Metal·lúrgica, ETSEIB, Technical University of Catalonia, Barcelona, Spain.
Journal of Materials Science. Materials in Medicine
|September 2, 2016
Summary
This study developed bioactive porous titanium implants with interconnected pores to improve bone integration. Bioactive treatment significantly enhanced tissue colonization, demonstrating potential for better spinal fusion outcomes.
Area of Science:
- Biomaterials Engineering
- Orthopedic Implants
- Tissue Engineering
Background:
- Intervertebral implants require low load requirements, high friction, and low elastic modulus to prevent stress shielding.
- Highly interconnected porous structures are crucial for stimulating bone ingrowth and enhancing implant-bone fixation.
Purpose of the Study:
- To create bioactive porous titanium implants with highly interconnected pores (approx. 57% porosity).
- To evaluate the in vivo performance of these porous titanium implants after bioactive treatment.
Main Methods:
- Porous titanium implants fabricated using powder sintering with a space holder technique and binder phase.
- Macropore interconnection diameter controlled at ~210 μm for osteoblast penetration.
- Thermo-chemical treatments applied for bioactivity enhancement; surface and mechanical properties analyzed.
Main Results:
- Sintering reduced stiffness, creating a porous network suitable for bone ingrowth.
- Compression and fatigue tests showed a balance between mechanical properties and pore interconnectivity.
- Bioactive treatment resulted in sodium titanates, promoting in vivo apatite formation.
- Bioactive titanium achieved >75% tissue colonization vs. 40% for untreated titanium.
Conclusions:
- Bioactive thermo-chemical treatment enhances porous titanium implant performance for spinal applications.
- The developed implants show significant potential for improved bone ingrowth and fixation.
- Optimized pore structure and surface bioactivity are key for successful intervertebral implant design.
