A Novel Strategy for Optimized Achilles Tendon Healing: DCN/Hep-Loaded Sutures

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Tendon healing is challenging due to its avascular nature, often leading to poor outcomes.
• Current repair methods struggle to fully restore native tendon strength and function.
• Bioactive factors hold potential to modulate the complex tendon healing cascade.

Purpose of the Study:

• To develop and evaluate a novel suture-based system incorporating bioactive factors for enhanced Achilles tendon repair.
• To investigate the effects of decorin (DCN) and heparin (Hep) on tendon stem cell (TSC) behavior and tendon healing.
• To assess the efficacy of Hep/DCN-loaded sutures in improving postoperative tendon healing and mechanical properties.

Main Methods:

• In vitro determination of optimal DCN concentration and ratio for TSC proliferation and differentiation.
• Fabrication of Hep/DCN-loaded sutures using electrospinning.
• In vivo evaluation of suture performance in an Achilles tendon repair model.
• Assessment of collagen organization, repair capacity, and tensile strength using histological, immunohistochemical, and mechanical analyses.

Main Results:

• Optimal DCN concentrations were identified for modulating TSC behavior in vitro.
• Electrospun Hep/DCN sutures demonstrated low immunogenicity and anti-adhesion properties.
• In vivo studies showed enhanced collagen fibril organization and improved Achilles tendon tensile strength post-repair.
• Molecular analyses confirmed improved healing markers and cellular responses.

Conclusions:

• A novel bioactive suture system incorporating Hep/DCN effectively promotes Achilles tendon healing.
• This approach enhances cellular responses and improves postoperative tissue strength.
• The developed system shows significant promise for clinical applications in tendon repair and offers a tool for studying TSC differentiation.