When a fracture takes more than the usual time to unite, it is said to have gone in delayed union. A large percentage of such fractures eventually unite. In some, the union does not progress, and they fail to unite. These are called non-union. Conventionally, it is not before 6 months that a fracture can be declared as non-union. It is often difficult to say whether the fracture is in delayed union, or has gone into non- union. Only progressive evaluation of the X-rays over a period of time can solve this issue. Presence of mobility at the fracture after a reasonable period is surely a sign of non-union. Presence of pain at the fracture site on using the limbs also indicates non-union. Non-union may be painless if pseudo joint forms between the fracture ends (pseudoarthrosis).