Aponeurosis discission, a low-detergent method for tissue-engineered acellular ligament scaffolds.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Orthopedic Surgery

Background:

• Detergent treatment is standard for decellularizing grafts but can damage the extracellular matrix.
• The aponeurosis layer of tendons hinders complete cell removal and subsequent recellularization.
• Developing improved decellularization methods is crucial for effective tissue engineering.

Purpose of the Study:

• To investigate a novel method for decellularizing the patellar tendon (PT) by targeting the aponeurosis layer.
• To evaluate the structural, mechanical, and biological properties of the resulting acellular graft.
• To assess the in vivo healing and integration of the acellular graft.

Main Methods:

• Dissecting the aponeurosis layer of the PT prior to decellularization.
• Utilizing a reduced detergent concentration and shorter treatment time for decellularization.
• Assessing collagen structure, mechanical properties, and biocompatibility in vitro and in vivo.
• Implanting the acellular aponeurosis discission ligament (AADL) into defective allogeneic PTs.

Main Results:

• Dissecting the aponeurosis facilitated efficient cell extraction with minimal detergent.
• The AADL preserved native collagen fibril structure and mechanical integrity.
• The AADL demonstrated excellent cell and tissue compatibility.
• AADL implantation resulted in good host integration and gradual collagen structure improvement over 12 months.

Conclusions:

• Targeting the aponeurosis layer is an effective strategy to improve tendon graft decellularization.
• This method enhances the biological properties of acellular grafts for tissue engineering.
• The AADL shows promising potential for reconstructive surgery in tendon defects.