A Novel Decellularized Fibrocartilage Graft Promotes Tympanic Membrane Repair

Area of Science:

• Biomaterials Engineering
• Regenerative Medicine
• Otolaryngology

Background:

• Tympanoplasty uses grafts to repair tympanic membrane perforations.
• Cartilage grafts are preferred for pediatric tympanoplasty over fascia grafts due to better mechanical properties, preventing complications like graft failure and cholesteatoma.
• Autologous grafts, while effective, lead to donor-site morbidity and longer surgical times.

Purpose of the Study:

• To evaluate a novel allogeneic decellularized porcine meniscus graft (MEND) for tympanoplasty.
• To compare MEND's efficacy against traditional autologous cartilage and fascia grafts in a preclinical model.
• To assess MEND's potential as an off-the-shelf alternative for pediatric tympanoplasty.

Main Methods:

• Engineered an allogeneic porcine meniscus decellularized (MEND) graft with a microchannel structure.
• Evaluated MEND in a rat tympanic membrane perforation model.
• Compared MEND to autologous cartilage and fascia grafts using otoendoscopy, histology, and immunohistochemistry over 4 weeks.

Main Results:

• Both MEND and auricular cartilage grafts achieved successful perforation closure by day 3.
• Fascia grafts showed frequent dislodgement due to poor mechanical integrity.
• MEND demonstrated superior graft closure and tissue integration by day 28, outperforming traditional grafts through full remodeling.

Conclusions:

• MEND exhibits excellent mechanical properties and promotes host cell integration for tympanic membrane repair.
• MEND offers a promising alternative to autologous grafts, potentially reducing donor-site morbidity and surgical time.
• The engineered MEND graft shows significant potential as an off-the-shelf solution for pediatric tympanoplasty.