disease

Kohler's Disease

DefinitionKohler's Disease

 

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

Kienbock's Disease

Definition 

 

Avascular necrosis & subsequent disintegration of lunate

 

Aetiology

 

50-75% history of trauma

 

Occasionally seen in sickle cell / steroid use

 

Pathogenesis

 

Vascular Theory

 

Trauma disrupting vascularity

- single incident with disruption of blood supply