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Delayed Union and Non Union
Gopisankar.M.G.
2008 MBBS
Nonunion
When a minimum of 9 months has elapsed since the injury
&
The fracture shows no radiologically visible progressive
signs of healing continuously for 3 months
Classification
Paley’s Classification
Muller and Weber’s Classification
Paley’s Classification
Type A Bone loss <1cm
Type B Bone loss >1cm
Muller & Weber’s classification
Amount of callus at the fracture site
1. Hypervascular Nonunion
2. Avascular Nonunion
Hypervascular
1. Hypertrophic/Elephant foot
2. Horse hoof
3. Oligotrophic
Avascular
1. Torsion Wedge
2. Comminuted
3. Defect
4. Atrophic
Causes of nonunion
Compound fractures
Infection
Segmental fractures
Distraction of fracture fragments
Soft tissue interposition
Ill devised open reduction
Insecure and inadequate fixation
Clinical features
History
1. Trauma resulting in fractures
2. Open fractures
3. Improper / delay / inadequate treatment
Symptoms
1. Minimal / no pain
2. Loss of function
Signs
1. Painless abnormal mobility
2. Shortening
3. Scars
4. Sinuses
5. Deformity
6. Wasting of limb muscles
Investigations
X-ray AP and Lateral view
1. Gap between fracture fragments
2. Fragments are rounded and sclerotic
3. Amount of callus formed could be less or more
4. Decreased density of bone is due to osteoporosis
Management
Surgery
1. Open reduction
2. Rigid internal fixation
3. Bone grafting
Electrical stimulation
Ilizarov’s technique
Bone Graft
Promotes Osteogenesis ,provide stability
Types
1. Cancellous Bone Graft
2. Cortical Bone Graft
3. Phemister Bone Graft
Cancellous bone Graft
In defects < 2.5cm
Better tolerated
Rapidly revascularized
Cortical Bone Graft
Fixation + Osteogenesis
Stabilizing property
For nonunion of shafts of any long bones
Single only when placed on one surface
Dual only when it is placed on both sides
Sliding graft piece is sided from above to the fracture
Phemister bone graft
Graft is placed subperiosteally
Blood supply is not disturbed
Simple
Placed posteriorly
Useful in tibia
Electrical stimulation in Nonunion
20 mA
Fibrous tissue fibrocartilage endochondral ossification
Types
1. Noninvasive
2. Semi invasive
3. Invasive
Pulsed Electromagnetic field after excision of fibrous tissue followed by grafting
Immobilization is done to decrease stress
Slow not always successful
Ilizarov’s technique
Best for infected nonunions
Corrects deformity + boneloss
In hypertrophic gradual compression
Avascular corticotomy , Bone transport and compression