Enhancement of fracture healing\

the work aims to discuss the different methods of enhancement of frcature heading besides revision of basic facts about the mechanism of fracture heading and diagnosis of delayed union and non union fracture heading is specialized type pf tissue heading leading to restoration of skeletal integrity before discussion of treatment of delayed union and non union basic facts about the mechanism of fracture heading ,diagnosis of hwading and hints on the defnitions of delayed union and non union should be clear in mind also the factors that adversely affect fracture heading should be well undertood before planning to deal with problem of delayed union and non union.