Reptiles escape predation by discarding of their limbs. Which they regrow later. They can only do this, as there immune systems use interferons. Which clear scar tissue routinely.
Once cleared, the limb will regrow. So we could give a drip of interferon-!a into the liver artery. This would involve the Dr., And a six month hospitals stay. Well worth it you say!
But there is a simple way. Medically validated by physiotherapist over the last 30 years. We wait for the limb to scar over. We then apply high intensity ultrasound to the stump.
The scar tissue is cleared internally. And the body stem cells, will regrow the adult or child limb. No hospital stay involved. The Dr. might have to progressively shortened a prosthetic limb. As your own limbs regrow.
This should also work for Thalidomide victims in South America. The abnormal stop marker, which is what the Thalidomide becomes, is shaken clear. And cleared by the liver.
The libm then regrow to normal size in 6 months to 2 years. A suitable device is an 8 W one MHZ ultrasound massage device. Produced from Amazon on or E-bay.
It will even fix head or spinal injuries. I suffered 30% brain damage in a car accident – now fixed.