A nonhealing fracture, also known as nonunions, occurs when some broken bones do not heal even when they get the best surgical or non-surgical treatment. This happens when the fracture moves too much or there is poor supply of blood. People who smoke are at a high risk of nonhealing fracture.
Causes:

• Degree of displacement
• Infection
• Lack of blood flow to the bone
• Separation of fractured ends of the bone

Symptoms:

• Tenderness
• Swelling
• Pain