Tissue engineering for total meniscal substitution: animal study in sheep model

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Orthopedic Surgery

Background:

• Meniscal tears are common injuries often requiring surgical intervention.
• Current treatments for total meniscal defects have limitations.
• Tissue engineering offers a potential solution for regenerating meniscal tissue.

Purpose of the Study:

• To evaluate a novel hyaluronic acid/polycaprolactone scaffold for total meniscal replacement.
• To assess the efficacy of augmenting the scaffold with autologous chondrocytes.
• To compare two surgical implantation techniques in a sheep model.

Main Methods:

• Twenty-four sheep underwent total medial meniscus replacement using cell-free or chondrocyte-seeded scaffolds.
• Two implantation techniques were compared: capsular/ligamentous fixation versus additional transtibial fixation.
• Specimens were evaluated macroscopically and histologically after 4 months.

Main Results:

• All scaffolds demonstrated good capsular ingrowth.
• The technique without transtibial fixation showed better implant integrity and less joint degeneration.
• Histology revealed cellular infiltration, vascularization, and significantly more cartilaginous tissue formation in chondrocyte-seeded scaffolds.

Conclusions:

• The HYAFF/polycaprolactone scaffold is a viable option for total meniscal substitution.
• Seeding scaffolds with autologous chondrocytes improves fibrocartilaginous tissue repair.
• Surgical technique influences implant outcomes and joint health.