A functional model for whole limb transplantation in the rat

Area of Science:

• Surgical innovation
• Animal models in transplantation research
• Regenerative medicine

Background:

• Whole limb transplantation presents significant challenges in achieving functional recovery.
• Existing models lack precision in nerve and muscle reinnervation, hindering comprehensive study.
• Developing a robust animal model is crucial for advancing transplantation techniques.

Purpose of the Study:

• To establish a novel, functional rat model for whole limb transplantation.
• To optimize surgical techniques for enhanced nerve and muscle recovery.
• To provide a reliable platform for studying limb transplantation outcomes.

Main Methods:

• Utilized inbred Lewis rats for donor and recipient roles.
• Modified biceps femoris muscle elevation to preserve adductor function.
• Performed separate anastomoses of sciatic nerve branches (tibial, peroneal, sural) and femoral nerve branches (saphenous).
• Employed intramedullary pin fixation for femur immobilization.

Main Results:

• Transplanted limbs achieved weight-bearing capacity between 17 and 22 days post-surgery.
• Observed gradual decrease in abnormal gait patterns, leading to a normal walking pattern.
• Developed reliable sciatic and tibial function indexes correlating with clinical observations.
• Demonstrated good and reliable sensory and ambulatory recovery in the model.

Conclusions:

• The developed rat model offers a functional approach to whole limb transplantation.
• The model facilitates precise nerve and muscle reinnervation, improving functional recovery.
• This study provides a valuable tool for future research in limb transplantation and regenerative medicine.