marfan's

Protrusio

Definition

 

Migration of the femoral head past the medial wall of the acetabulum / ilioischial line 

 

Centre edge angle > 40o

 

Aetiology

 

Primary 

 

Otto's Disease

- bilateral in one third

- middle aged females

- pain & decreased ROM early 

- coxa vara & OA common

- ? causally related to osteomalacia