acetabular

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

Incidence

2-3% of cases 

- doubles with infrequent operator

- second most common reason for revision after loosening

Australian Joint Registry

- dislocation accounts for 14.8% of revisions

Positions

Posterior dislocation

- hip flexed, adducted, IR