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Osteochondral Regeneration With Anatomical Scaffold 3D-Printing-Design Considerations for Interface Integration.

David S Nedrelow1,2, Jakob M Townsend1, Michael S Detamore1

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3D-printed scaffolds offer complex geometries for joint repair, but mechanical integrity is crucial. Mechanical interlocking designs and interface shear testing are recommended for robust osteochondral regeneration in load-bearing joints.

Keywords:
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Area of Science:

  • Biomaterials Engineering
  • Regenerative Medicine
  • Orthopedic Surgery

Background:

  • Clinical need exists for osteochondral scaffolds with complex geometries to restore articulating joint surfaces.
  • 3D-printing enables anatomically shaped scaffolds with interconnected architectures, surpassing limitations of simple plug-shaped designs for focal defects.
  • Mechanical loading and interface strength are critical challenges for 3D-printed osteochondral constructs, yet interface strength testing is often overlooked and lacks standardization.

Purpose of the Study:

  • To review 3D-printed scaffolds for osteochondral applications, focusing on interface integration and biomechanical evaluation.
  • To assess different 3D-printing methods and scaffold designs for creating multiphasic osteochondral constructs.
  • To recommend standardized methods for evaluating interface strength and integration in stratified scaffolds.

Main Methods:

  • Review of literature on 3D-printed scaffolds for osteochondral regeneration, including multiphasic cylindrical and anatomically shaped designs.
  • Analysis of various 3D-printing techniques such as fused deposition modeling, stereolithography, and bioprinting.
  • Evaluation of interface integration strategies, including interdigitating and mechanical interlocking designs.
  • Assessment of biomechanical evaluation methods, particularly interface shear testing.

Main Results:

  • 3D-printing allows for complex geometries and interconnected architectures in osteochondral scaffolds.
  • Multiphase scaffolds commonly use interdigitating or mechanical interlocking designs to enhance interface strength and prevent delamination.
  • Combining a robust 3D-printed osteal polymer with an interlocking chondral hydrogel phase shows promise for phase integration.
  • Interface shear testing is recommended for reliable evaluation of layer integration in stratified scaffolds.

Conclusions:

  • Mechanical interlocking is a promising strategy for scaling up multiphasic scaffold applications for large, anatomically shaped joint surface regeneration.
  • Standardized interface strength testing, specifically the interface shear test, is crucial for advancing the field and enabling direct comparisons.
  • The current body of research on 3D-printed interfacial scaffolds provides a strong foundation for future development in regenerating osteochondral tissues in load-bearing joints.