The classification of peripheral nerve injuries can again be easily divided into 3 main groups according to the 'Rule of 3'. This is fracturees and dislocations, direct wounds and other causes.

ii. Direct wounds - These include penetrating gunshot wounds and wounds due to knives and other instruments. Open wounds and compound fractures are in fact a much commoner cause of division of nerves.

iii. Other causes of peripheral nerve paralysis - These include diabetes, leprosy, and peripheral neuritis due to vitamin B deficiency.