The most impoant cause of Nonunion of fracture of - humeral shaft is
D i.e. Distraction at fracture site Fracture shaft humerus is the easiest of major long bone fractures to be treated by conservative methods. And the most common cause of delayed union or nonunion is distraction at fracture siteQ due to gravity and weight of plaster.
Comminuted fracture
Compound (Open) fracture
Overriding of fracture ends
Distraction at fracture site