1) Orthopedic surgical procedure 
In bone surgery, a corticotomy is a cutting of the bone that may or may not split it into two pieces (bone fracture) but involves cortex only, leaving intact the medullary vessels and periosteum. Corticotomy is particularly important in distraction osteogenesis. ...
a special osteotomy where the cortex is surgically divided, but the medullary contents and the periosteum are not
A special osteotomy where the cortex is surgically divided, but the medullary contents and the periosteum are not.