Silk and collagen scaffolds for tendon reconstruction

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Tendon injuries require effective reconstruction methods.
• Silk and collagen are biocompatible materials with potential for tissue regeneration.
• Sericin removal from silk may reduce inflammatory responses.

Purpose of the Study:

• To develop and evaluate an artificial tendon scaffold using braided silk and a collagen/chondroitin-6-sulfate sponge.
• To assess the in vivo inflammatory response to raw and sericin-free silk tubes.
• To characterize the structural and mechanical properties of regenerated tendons.

Main Methods:

• Braiding silk thread into a tube and removing sericin.
• Infiltrating the silk tube with collagen/chondroitin-6-sulfate solution and lyophilizing.
• Implanting silk tubes in mice to assess inflammation.
• Evaluating regenerated tendons in a rabbit model for structural, mechanical, and histological properties.

Main Results:

• Sericin-free silk tubes elicited milder inflammatory responses than raw silk tubes.
• Regenerated tendons exhibited native-like structure, appearance, and diameter.
• Tensile strength of regenerated tendons reached 167 ± 30 N, approaching native tendon strength (220 ± 20 N).
• Histological analysis confirmed organized collagen fibers and extracellular matrix, with some fibrosis.

Conclusions:

• A braided silk tube combined with a lyophilized collagen sponge is effective for artificial tendon reconstruction.
• This scaffold promotes neo-tendon tissue regeneration with properties similar to native tendons.
• The developed artificial tendon shows potential for clinical applications in tendon repair.