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Related Experiment Video

Updated: Feb 10, 2026

Arthroscopic Management of Massive Irreparable Rotator Cuff Tears: Whole Rotator Cable Reconstruction Using Proximal Biceps Tendon Autograft
07:22

Arthroscopic Management of Massive Irreparable Rotator Cuff Tears: Whole Rotator Cable Reconstruction Using Proximal Biceps Tendon Autograft

Published on: June 6, 2025

694

Functionally Graded, Bone- and Tendon-Like Polyurethane for Rotator Cuff Repair.

Dai Fei Elmer Ker1, Dan Wang1, Anthony William Behn1

  • 1Department of Orthopaedic Surgery Stanford University 300 Pasteur Drive, Stanford, CA 94305, USA.

Advanced Functional Materials
|May 23, 2018
PubMed
Summary

Researchers developed a novel polyurethane biomaterial for rotator cuff repair. This material mimics bone and tendon properties, offering enhanced stability and reduced suture migration for improved healing.

Keywords:
biomedical applicationsbiomimeticspolymeric materialsrotator cuff repairtissue engineering

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Area of Science:

  • Biomaterials Engineering
  • Tissue Engineering
  • Orthopedic Surgery

Background:

  • Rotator cuff repair requires biomaterials with bone-tendon-like mechanical properties for physiological loading and long-term stability.
  • Existing biomaterials often lack the necessary mechanical and physicochemical attributes for optimal rotator cuff repair.

Purpose of the Study:

  • To develop a novel UV-crosslinkable polyurethane (QHM polymers) free of solvent, catalyst, and photoinitiator for rotator cuff repair.
  • To evaluate the mechanical and biophysicochemical properties of QHM polymers for their suitability in interfacial tissue engineering.

Main Methods:

  • Synthesis of quadrol (Q), hexamethylene diisocyanate (H), and methacrylic anhydride (M) based polyurethane (QHM polymers).
  • Mechanical characterization including tensile and compressive testing, cyclic loading, and stiffness gradient analysis.
  • Biophysicochemical evaluation including degradation studies, in vitro cytotoxicity assays, ex vivo suture retention tests, and in vivo biocompatibility studies in rat supraspinatus tendon repair.

Main Results:

  • QHM polymers exhibit phototunable bone- and tendon-like mechanical properties (12-74 MPa tensile strength, 0.6-2.7 GPa tensile modulus).
  • The material demonstrated resilience to 10,000 cycles of physiological loading and reduced stress concentrations through stiffness gradients.
  • QHM polymers showed slow degradation (5-30% mass loss over 8 weeks), minimal cytotoxicity, superior suture retention (2.79-3.56-fold less migration), and good in vivo biocompatibility.

Conclusions:

  • Functionally graded, bone-tendon-like QHM polymers represent a promising biomaterial for rotator cuff repair.
  • The developed polyurethane offers enhanced stability, reduced stress shielding, and improved healing augmentation.
  • This study highlights the potential of QHM polymers in interfacial tissue engineering for orthopedic applications.