Fracture of shaft of humerus is very amenable to treatment but a percentage of fractures do not heal. Normal healing of a humeral fracture occurs over 8 to 10 weeks. If the fracture has not achieved union by 3 to 4 months, it can be considered a delayed union. If union does not occur by 6 to 8 months it is called non union of the fracture.

Non unions are two types

• Hypertrophic
• Atrophic

Hypertrohic occurs due to increased vascularity which allows abundant callus to form. The callus formed has insufficient stability to prevents union. [Read more...]