When a fracture does not unite in proper position, it is said to have malunited. A slight degree of malunion occurs in a large proportion of fractures, but in practice the term is reserved for cases where the resulting disability is of clinical significance. Causes: Improper treatment is the commonest cause. Malunion is therefore preventable in most cases by keeping a close watch on position of the fracture during treatment. Sometimes, malunion is inevitable because of unchecked muscle pull (e.g., fracture of the clavicle), or excessive comminution (e.g., Colles’ fracture). Common sites: Fractures at the ends of a bone always unite, but they often malunite e.g., supracondylar fracture of the humerus, Colles’ fracture etc.