neck shaft angle

Definition

Deformity causing alteration of mechanical axis from knee centre

Aims

1.  Normal leg alignment

2.  Equal leg lengths

Definition

Deformity of proximal femur with neck-shaft angle <125°

Characterised by

- coxa vara

- decreased femoral anteversion

- limp / trendelenberg

- stress fractures

- early OA

Classification   

"ACDDC"

Acquired

2° to underlying disorder

- rickets