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Combining Peripheral Nerve Grafting and Matrix Modulation to Repair the Injured Rat Spinal Cord
Published on: November 20, 2009
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Revascularization patterns of nerve allografts in a rat sciatic nerve defect model
Tiam M Saffari1, Femke Mathot2, Patricia F Friedrich3
1Department of Orthopedic Surgery, Mayo Clinic, 200 1st St. SW, Rochester, MN 55905, USA; Department of Plastic-, Reconstructive- and Hand Surgery, Erasmus Medical Center, Doctor Molewaterplein 40, 3015 GD Rotterdam, the Netherlands.
Journal of Plastic, Reconstructive & Aesthetic Surgery : JPRAS
|January 14, 2020
Summary
Surgically induced angiogenesis significantly enhances nerve graft revascularization. This study reveals that nerve repair primarily occurs from proximal to distal, supporting centripetal revascularization, not from both ends.
Area of Science:
- Regenerative Medicine
- Vascular Biology
- Nerve Repair
Background:
- Revascularization patterns of allograft nerves post-vascularization are not fully understood.
- Optimized processed allografts (OPA) are used for nerve repair.
- Surgically induced angiogenesis aims to improve graft vascularization.
Purpose of the Study:
- To determine revascularization patterns of OPA with surgically induced angiogenesis.
- To compare OPA with and without enhanced vascularization in a rat sciatic nerve model.
- To investigate the directionality of nerve graft revascularization.
Main Methods:
- Sciatic nerve gaps in 51 rats were repaired using autografts, OPA, or OPA with a vascularized flap (SIEF).
- Micro CT and photography assessed vascular volume and surface area at 2, 12, and 16 weeks.
- Vessel quantification was performed in proximal, mid, and distal nerve sections.
Main Results:
- SIEF group showed superior vascular surface area compared to controls at 2 weeks.
- Vascularity in SIEF nerves was significantly higher than allografts at 12 and 16 weeks.
- SIEF nerves had more vessels in proximal and mid-sections versus allografts alone.
Conclusions:
- Surgical angiogenesis significantly improves nerve graft revascularization.
- Revascularization predominantly occurs in a proximal-to-distal direction (proximal inosculation).
- Findings support the theory of centripetal revascularization in nerve grafts.
