Uncemented acetabulum
Concept
1. Initial press fit with mechanical stability
1. Initial press fit with mechanical stability
Direct blow
- most common
Indirect
- forced knee flexion with foot fixed / maximally contracted quadriceps
1. Vertical
2. Transverse
Type I: Undisplaced avulsion fracture
Type II: Anterior portion displaced & hinged
Type IIIA: Displaced
Type IIIB: Displaced & Rotated