acetabular

Incidence

Subcapital Femoral Neck Metastasis

Fractures

Principle

- do very poorly with fixation

- hemiarthroplasty or THR

- stem should be 2.5 cortical diameters beyond any area of weakness

- THR if acetabulum involved

Anatomy

Bones more elastic and malleable

- absorb much more energy

Very thick periosteum

- can be periosteal sleeve fracture

Ossification

Triradiate cartilage fuses 13-16

Iliac / Ilium / ASIS apophysis

- appear as teenager

- fuse a couple of years later

- can confuse with fracture

Classification Key & Conwell 1951