The following fractures are known for nonunion, EXCEPT:
The distal humeral metaphysis (supracondylar area) is a well vascularized area with remarkably rapid healing and nonunion of a supracondylar fracture is extremely rare. Non union is almost never seen without infection (open wounds) and/ or extensive soft tissue devascularization. Ref: Tachdjian's Pediatric Ohopedics 3/e, Page 2130-75, 2060; Rockwood and Green's Fracture in Children 6/e, Page 543-86.
Fracture lower half of tibia
Fracture of neck of femur
Fracture of scaphoid
Supracondylar fracture of humerus