Pig Bladder Hormone Causes Soldier to Regrow Leg Muscle

Marine Isaias Hernandez lost 70 per cent of his right thigh muscles when an enemy mortar exploded as he tried to carry out repairs to a truck in Afghanistan. 

With such severe muscle damage Hernandez would ordinarily have had his leg amputated.
But a re-think in the way soldiers are treated led to the wounded warrior being injected with a growth promoting substance extracted from pig bladders... 

....The wounded Marine's recovery is particularly exciting for scientists as it involves the regeneration of skeletal muscle which ordinarily does not grow back. 

The new treatment could in theory revolutionise how not just how soldiers are treated, but all potential amputees. 

In preparation for the operation, corporal Hernandez was made to build up the remaining 30 per cent of muscle left on the damaged thigh. 

Surgeons then sliced into the thigh, placing a thin slice of a substance called extracellular matrix.
The surgery is the result of a $70 million investment by the U.S. military into regenerative medicine research.
[Daily Mail]