Pipkin fractures

Incidence

5-15% of posterior dislocations

Aetiology

Posterior hip dislocation

Pipkin Classification

Type I - head fracture below fovea

Undisplaced

- non operative

Displaced

- excise fragment if small

- ORIF fragment if large (can contribute to instability)

Incidence

Young men

Posterior / Anterior 9:1

Aetiology

High velocity injury

- head direction at impact decides direction of dislocation

Anterior Dislocation 

Externally rotated & abducted leg

- flexion = inferior dislocation