Hip dislocation is a relatively rare entity and may be congenital or acquired.
Hip dislocations account for ~5% of all dislocations .
There are numerous patterns of dislocation :
- posterior hip dislocation (most common ~85%)
- anterior hip dislocation (~10%)
- inferior (obturator) hip dislocation
- superior (pubic/iliac) hip dislocation (rare)
- central hip dislocation (protrusio) - always associated with acetabular fracture
Acquired hip dislocation is normally associated with high-speed trauma, with motor vehicle collisions account half of the dislocation with other causes such as falls and sports injuries, less common .
Hip dislocation is the second most common complication of hip joint replacements and occurs in ~5% (range 0.5-10%) of patients with ~60% of dislocations being recurrent .
Congenital hip dislocation is now considered part of the spectrum of developmental dysplasia of the hip (see the article for further information) .
- avascular necrosis: particularly if reduction postponed more than 24 hours