Motorcyclist fracture is: (AIPG 2011)
|C||Skull divided into two halves|
Skull divided into two halves.
a. Ring or Foramen fractures:
i. It is fissuredfracture of the skull which encircles the skull in such a manner that the anterior third is separated at its junction with the middle and posterior third
ii. fracture line runs at about 3 – 5 cm. outside the foramen magnum at the back and sides of the skull and passes forwards through the middle ears and roof of the nose due to which the skull is separated from the spine.
b. Comminuted fractures: In this skull fracture variety, the bone is broken into multiple pieces. e.g. RSA, fall from a height on a hard surface, and from blows by weapons with a large striking surface, kick by an animal, bullet injury, resembles a spider’s web or mosaic.
c. Subdural Haemorrhage:
i. It is common in childhood or old age.
ii. Occurs in subdural space between the duramater and arachnoid due to rupture of bridging or communicating veins, inferior cerebral veins, and cortical veins i.e. source of blood is venous or capillary, not arterial.
iii. Found in alcoholics old persons and in children.
iv. Death may occur if the hemorrhage > 50 ml.