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Three-dimensional-construct bioreactor conditioning in human tendon tissue engineering.

Colin Y L Woon1, Armin Kraus, Shyam S Raghavan

  • 1Section of Plastic Surgery, Division of Plastic and Reconstructive Surgery, Stanford University Medical Center, VA Palo Alto Health Care System, Stanford, California 94305, USA.

Tissue Engineering. Part A
|May 27, 2011
PubMed
Summary
This summary is machine-generated.

Tissue-engineered constructs (TECs) for hand tendons can be improved by reseeding and dynamic conditioning in bioreactors. Conditioning duration significantly impacts biomechanical properties, but load magnitude does not, requiring further study before clinical application.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Surgery

Background:

  • Human tendon tissue engineering aims to restore function after hand and forearm injuries.
  • Optimizing biomechanical properties of tissue-engineered constructs (TECs) is crucial for successful reimplantation.
  • Bioreactor parameters significantly influence the mechanical integrity of TECs.

Purpose of the Study:

  • To identify bioreactor treatment parameters that enhance the biomechanical properties of human tendon TECs.
  • To investigate the effects of reseeding, load magnitude, conditioning duration, and testing delay on TECs.
  • To determine optimal conditioning strategies for clinical application of tendon TECs.

Main Methods:

  • Utilized small- and large-chamber three-dimensional-construct bioreactors (SCB and LCB) to apply cyclic axial load to TECs.
  • Tested TECs comprising reseeded human flexor and extensor tendons.
  • Evaluated the impact of reseeding, load duty cycle, load magnitude, conditioning duration, and testing delay on ultimate tensile stress (UTS) and elastic modulus (EM).

Main Results:

  • Reseeding and dynamic conditioning significantly improved UTS and EM compared to acellular or unloaded controls.
  • Conditioning duration of 8 days enhanced biomechanical properties, while 3 days showed reduced properties.
  • Load magnitude did not significantly affect UTS or EM; however, a 2-day delay post-conditioning led to property attrition.

Conclusions:

  • Reseeding and dynamic conditioning in bioreactors can enhance the material properties of human allograft tendon TECs.
  • Conditioning duration is a critical factor, whereas load magnitude is less influential.
  • Addressing the attrition of biomechanical properties over time is essential for the clinical integration of bioreactor preconditioning.