Osteoarthritis
Epidemiology
Usually after 50-60 years of age
Aetiology
Primary 90% of cases
Secondary
- AVN
- trauma
- instability
Pathology
Usually after 50-60 years of age
Primary 90% of cases
Secondary
- AVN
- trauma
- instability
Non-union
- arrest of progression to union at fracture site
- > 6-9 /12
- no visible progressive signs of healing for at least three consecutive months
- individualise for each fracture
- when the surgeon believes the fracture has little or no chance to heal
Delayed union
- failure of fracture to unite within expected time
- still may spontaneously unite