Nerve Injury

Question 1

Neurapraxia

Answer 1

Conduction deficit without damage to the axon. 1st degree sunderland

Question 2

Axonotmesis

Answer 2

Axon damage without endoneurial tube damage
Wallerian degeneration – degeneration of the axon distal to the injury

Question 3

Neurotmesis

Answer 3

similar to 5th degree Sunderland)
Nerve severance with complete disruption of the endoneurial tube
Most severe (irreversible with muscle atrophy)

Question 4

Distal Wallerian degeneration

Answer 4

degeneration of the axon distal to the injury

Question 5

Nerve conduction studies – will physically measure

Answer 5

velocity at which a nerve is transmitting a signal

Question 6

External neurolysis

Answer 6

free the nerve without touching the nerve”
Physically remove scar tissue and place in a better environment

Question 7

Internal neurolysis

Answer 7

when you actually incise thru the epineurium to free up individual fascicules
Remove “internal” impeding anatomy, must be done with loupes or microscope, fairly rare undertaking for most podiatric surgeons, technique tips

Question 8

Neurectomy

Answer 8

physically transect the nerve proximal to the pathology