Blow out fracture of orbit leads to fracture in (AIIMS Nov 2009)
|A||Posterior wall of floor of orbit|
|B||Roof of orbit|
|C||Medial wall of orbit|
|D||Postero Medial part of floor of orbit|
(Reference: Kanski Clinical ophthalmology Edition 6 page 848,166,851)
1. A blow out fracture of the orbital floor is typically caused by a sudden increase in orbital pressure by a striking object which is greater than 5 cm in diameter, greater than the orital sin diameter such as a fist or tennis ball.
2. The fracture most frequently involves the floor of the orbit along the thin bone covering the infra orbital canal.
3. The floor consists of three bones: Zygomatic, Maxillary and Palatine.
4. The posteromedial portion of the maxillary bone is relatively weak and may be involved in a ‘blowout’ fracture.
5. Fracture of the Roof of the orbit known as ‘blow in’ fractures.
6. Most medial wall orbital fractures are associated with floor fracture