Kohler's Disease
Definition
Osteonecrosis of the navicular
Epidemiology
Present at age 4-6 years
- same as Perthes disease
M:F 5:1
Bilateral in 20%
Aetiology
Repetitive trauma to maturing ossific nucleus
Osteonecrosis of the navicular
Present at age 4-6 years
- same as Perthes disease
M:F 5:1
Bilateral in 20%
Repetitive trauma to maturing ossific nucleus
Avascular necrosis & subsequent disintegration of lunate
50-75% history of trauma
Occasionally seen in sickle cell / steroid use
Trauma disrupting vascularity
- single incident with disruption of blood supply