Blow out fracture can be due to:: (A) Tennis ball injury, (B) Chisel and hammer injury, (C) Sudden fall, (D) Punch at the chin from below
Answer is A. Blow out orbital fracture result from trauma to orbit by a relatively large often rounded object such as tennis ball, cricket ball, human fist, or a pa of automobile.The force of blow causes a backward displacement of the eyeball and increase in the intraorbital pressure. CLASSIFICATION 1 PURE BLOW OUT FRACTURE - NOT associated with involvement of the orbital rim 2 Impure blow out - associated with other fractures about the middle third of facial skeleton - Inferior wall M/C involved - Entrapment of inferior rectus in inferior wall - not able to look up- Hanging drop or tear drop sign Features (1) Enophthalmos (2 ) Diplopia(3) Infra orbital nerve anesthesia