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Flexor tendon tissue engineering: bioreactor cyclic strain increases construct strength.

Sepideh Saber1, Andrew Y Zhang, Sae H Ki

  • 1Division of Plastic and Reconstructive Surgery, Stanford University Medical Center, Stanford, California, USA.

Tissue Engineering. Part A
|January 30, 2010
PubMed
Summary
This summary is machine-generated.

Tissue engineering using bioreactor cyclic loading significantly enhanced the strength and elasticity of tendon constructs. This method may accelerate the creation of non-immunogenic tendon grafts for clinical use.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Surgery

Background:

  • Mutilating hand and upper extremity injuries often cause tendon loss exceeding autologous graft capacity.
  • Current reconstructive options for severe tendon loss are limited.
  • Tissue engineering offers a potential solution for generating functional tendon tissue.

Purpose of the Study:

  • To investigate the efficacy of tissue engineering techniques in producing functional tendon material.
  • To evaluate the impact of cyclic mechanical loading on the mechanical properties of engineered tendon constructs.
  • To assess the potential of bioreactor-produced tendon material for clinical applications.

Main Methods:

  • Acellularized rabbit flexor digitorum profundus tendon equivalents were used as scaffolds.
  • Scaffolds were reseeded with tenocytes or left unseeded.
  • Tissue-engineered constructs were subjected to cyclic mechanical loading (1.25 N for 5 days) in a custom bioreactor.
  • Ultimate tensile stress (UTS) and elastic modulus (E) were measured.

Main Results:

  • Seeded tendon constructs exposed to bioreactor loading exhibited significantly increased UTS (71.17 ± 14.15 N) compared to nonloaded controls (35.69 ± 5.62 N).
  • Cyclic loading also significantly enhanced the elastic modulus (E) of seeded constructs (1091 ± 169 MPa) versus controls (632 ± 86 MPa).
  • These improvements were statistically significant (p = 0.001).

Conclusions:

  • Cyclic mechanical loading in a bioreactor effectively improves the mechanical properties of engineered tendon constructs.
  • This tissue engineering approach shows promise for accelerating the in vitro production of strong, non-immunogenic tendon material.
  • The developed technique may provide a viable clinical solution for reconstructing significant tendon losses.