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Tissue transformation into bone in vivo. A potential practical application.

R K Khouri¹, B Koudsi, H Reddi

¹Department of Surgery, Washington University School of Medicine, St Louis, Mo. 63110.

|October 9, 1991

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Researchers transformed muscle flaps into custom-shaped, vascularized bone grafts using osteogenin and demineralized bone matrix. This tissue transformation technique offers potential for creating patient-specific skeletal replacement parts.

Area of Science:

Biomaterials Science
Tissue Engineering
Regenerative Medicine

Background:

Mesenchymal tissue transformation into bone is achievable via osteogenin and demineralized bone matrix.
Developing vascularized bone grafts for skeletal reconstruction is a significant clinical need.

Purpose of the Study:

To investigate the feasibility of transforming muscle flaps into vascularized bone grafts of specific shapes.
To assess the efficacy of osteogenin and demineralized bone matrix in inducing bone formation within muscle flaps.

Main Methods:

Rat experimental model utilizing thigh adductor muscle island flaps.
Flaps were enclosed in silicone molds and treated with osteogenin and demineralized bone matrix.
Control flaps received vehicle only; implantation was subcutaneous for 10 days.

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Main Results:

Treated flaps fully transformed into cancellous bone matching the mold's shape.
Control flaps showed no tissue transformation, remaining as intact muscle.
Generated in vivo, autogenous, well-perfused bone in specific shapes (femoral heads, mandibles).

Conclusions:

Osteogenin and demineralized bone matrix effectively induce muscle tissue transformation into bone.
This method allows for the in vivo generation of custom-shaped, vascularized autogenous bone grafts.
Potential application in creating patient-specific skeletal replacement parts for various anatomical defects.