<unk>  usually occur when head of femur forced into acetabulum
Obvious when displaced, subtle non-displaced<unk> 
Open book<unk> <unk> Straddle<unk> <unk> unk>  avulsion<unk> Anterior column-anterior acetabulum to pubic ramus
Posterior column- posterior acetabulum to ischial ramus
Anterior and posterior columns merge to form<unk>  dome= weight bearing portion<unk>  involving<unk>  dome require operative fixation<unk>  involving<unk>  dome require operative fixation
Acetabular pelvic fractures
Acute Trauma
Straddle pelvic fracture
Femur fracture
Pelvic avulsion fracture
Proximal
Pelvic fractures
Intracapsular