Flap prefabrication and prelamination with tissue-engineered cartilage

Area of Science:

• Regenerative Medicine
• Tissue Engineering
• Reconstructive Surgery

Background:

• Tissue-engineered cartilage integration into free flaps offers potential for complex reconstructive needs.
• Prefabrication of microvascular flaps with engineered tissues is an emerging area in reconstructive surgery.

Purpose of the Study:

• To investigate the prefabrication of a microvascular free flap using a vessel loop in a rabbit model.
• To evaluate the preliminary outcomes of integrating autologous tissue-engineered cartilage with prefabricated flaps, assessing matrix development, inflammation, and host interaction.

Main Methods:

• A vessel loop was implanted under a rabbit's abdominal skin flap for prefabrication.
• Autologous chondrocytes were expanded, seeded onto a hyaluronic-acid scaffold, and cultivated to create tissue-engineered cartilage constructs.
• Constructs were implanted with prefabricated flaps and controls, then analyzed after 6 or 12 weeks using angiography, histology, and immunohistochemistry.

Main Results:

• Prefabricated flaps exhibited robust neovascularization, integrating the vessel loop with the flap's native blood supply.
• Tissue-engineered cartilage constructs maintained size and demonstrated characteristics of hyaline cartilage, including collagen type II and proteoglycan expression.
• No inflammatory reactions were observed, indicating good biocompatibility and host acceptance.

Conclusions:

• The autologous rabbit model supports matrix deposition and maturation of engineered cartilage constructs.
• Combining prefabricated axial flaps with tissue-engineered cartilage shows promise for creating functional tissue components in reconstructive surgery.
• This technique may lead to reconstructive solutions with reduced donor-site morbidity.