Bridging tendon defects using autologous tenocyte engineered tendon in a hen model

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Orthopedic Surgery

Background:

• Tendon defects pose significant challenges in plastic surgery due to limited autograft availability and issues with allografts and prosthetics.
• Tissue engineering offers a promising solution by utilizing autologous cells to create functional tendon replacements.

Purpose of the Study:

• To evaluate the feasibility of engineering tendon tissue using autologous tenocytes to repair defects in a hen model.
• To assess the gross, histologic, and biomechanical outcomes of engineered tendons compared to scaffold-only controls.

Main Methods:

• Autologous tenocytes were isolated, expanded, and seeded onto unwoven polyglycolic acid scaffolds.
• Cell-scaffold constructs were wrapped with intestinal submucosa and cultured before implantation into 3-4 cm tendon defects in Leghorn hens.
• Control groups received scaffold material alone, with specimens harvested at 8, 12, and 14 weeks for analysis.

Main Results:

• Engineered tendons formed bridging tissue by 8 weeks, resembling natural tendons in appearance by 14 weeks.
• Histology showed progressive collagen alignment and integration with host tissue, with engineered tendons exhibiting 83% of normal tendon strength at 14 weeks.
• Control scaffolds degraded rapidly and provided minimal structural support, achieving only 9% of normal tendon strength.

Conclusions:

• In vivo tendon tissue engineering is feasible for bridging tendon defects.
• The engineered tendons demonstrated comparable gross, histologic, and biomechanical properties to native tendons.
• This approach holds potential for addressing limitations in current tendon repair strategies.