A 29-year-old man has successfully undergone a double hand transplant, a procedure hospital staff are referring to as a “medical marvel six years in the making.” Luka Krizanac — from Zurich, Switzerland — was 12 years old when a major infection that was treated incorrectly led to multi-organ failure and severe sepsis. In order to save his life, doctors had to amputate parts of his arms and legs.