Improved tendon healing using bFGF, BMP-12 and TGFβ1 in a rat model

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Orthopedic Surgery

Background:

• Tendon healing involves various growth factors (GFs).
• The combined effect of multiple GFs on tendon repair is not well understood.
• Optimizing GF delivery is crucial for enhancing tendon healing outcomes.

Purpose of the Study:

• To investigate the efficacy of combining basic fibroblast growth factor (bFGF), bone morphogenetic protein 12 (BMP-12), and transforming growth factor beta 1 (TGFβ1) for tendon healing.
• To compare different methods of GF application: direct application, sequential injection, and collagen sponge loading.

Main Methods:

• A rat Achilles tendon transection model was used.
• Growth factors were applied via direct application, tiered percutaneous injection, or loaded onto a collagen sponge.
• Tendon healing was assessed at 1, 2, 4, and 8 weeks post-surgery, evaluating length, thickness, mechanical properties, and histology.

Main Results:

• Loading GFs onto a collagen sponge yielded the best results, significantly increasing mechanical strength (71.2 N vs. 7.7 N in controls) and promoting faster tendon remodeling.
• Sequential, tiered percutaneous injection of GFs also showed improved outcomes compared to direct application.
• GF-loaded sponges maintained consistent tendon length over time, unlike control groups.

Conclusions:

• Implantation of a GF-loaded collagen sponge represents a promising therapeutic strategy for tendon repair, particularly for athletes and revision cases.
• Tiered percutaneous GF application offers a viable conservative treatment option for improving clinical outcomes.
• Combined application of bFGF, BMP-12, and TGFβ1, delivered via a collagen sponge, effectively enhances tendon healing.