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Interface Performance Enhancement in 3D-Printed Biphasic Scaffolds with Interlocking Hourglass Geometry.

David S Nedrelow1,2, Michael S Detamore3,4

  • 1Stephenson School of Biomedical Engineering, University of Oklahoma, Norman, OK, USA.

Annals of Biomedical Engineering
|July 11, 2025
PubMed
Summary
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This study designed a 3D-printed biphasic scaffold with an hourglass geometry to improve biomechanical performance in hinge joints. The novel scaffold design enhanced shear and compression resistance, offering potential for joint tissue regeneration.

Area of Science:

  • Biomedical Engineering
  • Regenerative Medicine
  • Materials Science

Background:

  • Ginglymus joints (e.g., knee, elbow, TMJ) experience unidirectional shear and orthogonal compression.
  • Biphasic scaffolds for joint repair must withstand these complex biomechanical loads.
  • Existing scaffold designs may not adequately address the specific mechanical demands of hinge joints.

Purpose of the Study:

  • To computationally design and empirically evaluate a 3D-printed biphasic scaffold with enhanced biomechanical performance for ginglymus joints.
  • To introduce a novel sinusoidal hourglass tube geometry to improve shear stress support and orthogonal compression resistance.
  • To assess the scaffold's performance under various loading conditions compared to a standard crosshatch design.

Main Methods:

Keywords:
AgaroseChondrogenicHyaluronanOsteogenicTissue engineering

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  • Computational modeling was used to design a 3D-printed polylactic acid (PLA) hourglass scaffold.
  • The scaffold interface was infilled with hydrogels (agarose or pentenoate-modified hyaluronic acid, polyethylene glycol diacrylate, and devitalized cartilage).
  • Biphasic constructs and the hourglass architecture alone were tested under shear and compression using empirical and in silico methods.

Main Results:

  • The PHA-PEGDA-DVC hydrogel-infilled scaffold achieved ultimate interface shear stresses up to 51 ± 7 kPa, outperforming the crosshatch control.
  • The hourglass architecture alone demonstrated a 39% higher ultimate compressive stress (6.9 ± 1.8 MPa) in the 3-direction compared to the crosshatch design.
  • Computational modeling indicated geometry-dependent shear load transfer, supporting the hourglass design's effectiveness.

Conclusions:

  • The 3D-printed hourglass biphasic scaffold design significantly enhances biomechanical performance under shear and compression relevant to ginglymus joints.
  • This novel geometry offers improved load transfer at the hydrogel-substrate interface and superior compressive strength.
  • The enhanced hourglass design holds promise for future applications in regenerating tissues within hinge joints.