Prefabricated vascularized bone flap: a tissue transformation technique for bone reconstruction

Area of Science:

• Regenerative Medicine
• Biomaterials Science
• Surgical Innovation

Background:

• Bone reconstruction presents challenges in achieving adequate vascularization and survival of grafted bone.
• Existing methods often struggle with graft integration and long-term viability.

Purpose of the Study:

• To develop a vascularized bone flap using recombinant human bone morphogenetic protein 2 (rhBMP-2).
• To create new, naturally vascularized bone for enhanced graft survival and custom shaping.
• To evaluate the potential of this model for therapeutic bone reconstruction.

Main Methods:

• Utilized silicone molds in the shape of a rat mandible to guide bone formation.
• Impregnated rat bone matrix with rhBMP-2 (experimental group) or a control substance.
• Sandwiched a muscle pedicle, vascularized by saphenous vessels, within the molds and assessed bone formation at 2 and 4 weeks.

Main Results:

• Muscle flaps treated with rhBMP-2 successfully produced new bone that precisely replicated the mold's shape.
• The newly formed bone was vascularized by the saphenous vessels, indicating successful integration.
• Control flaps without rhBMP-2 showed no evidence of bone tissue transformation.

Conclusions:

• rhBMP-2 effectively induces the formation of vascularized bone within a muscle pedicle.
• This experimental model demonstrates significant potential for effective bone reconstruction applications.
• The technique allows for the fabrication of newly formed bone into desired shapes, improving therapeutic outcomes.