Causes of nonunion
1, poor fracture fixation: the fracture end often moves, causing repeated injury and bleeding of granulation tissue, affecting callus formation, and making the fracture unable to heal according to normal rules.
2. Poor local blood circulation: it causes hematoma organization and delayed callus formation. The reason is that the fracture damages the main blood supply source and obviously reduces the local blood circulation, such as femoral neck fracture and carpal tunnel.
Fracture, tibia or ulna fracture, etc. Another reason is that too much periosteum was stripped during the operation, which destroyed the local blood supply.
3. Electrolysis caused by poor internal fixation quality: poor internal fixation quality will cause electrolytic corrosion in vivo, destroy bones and affect the healing process.
4. Infection: After infection, local congestion and edema can last for several months. Ossification began only after the infection was controlled and the congestion disappeared. Coupled with the stimulation and exercise of frequent dressing changes, fracture healing is more difficult.
5. Excessive continuous traction: excessive traction separates broken bones. If not corrected in time, it will often lead to delayed healing or non-healing. Especially within 2-3 weeks after injury, when hematoma is forming.
Excessive stretching damages the bud tissue and capillaries, even if the broken end separation is corrected later, it will affect the healing.
6, bone defect: mainly during the operation, too many bone fragments were removed.