Entrapment Neuropathies Flashcards
What is Seddon’s classification used to describe?
nerve injury
what are the 3 parts to Seddon’s classification?
- neurotmesis
- axontmesis
- neuropraxia
which is the most devastating nerve injury?
neurotmesis - implies compelte disruption of a nerve as well as associated CT
what is neurotmesis?
(Nerve division) implies complete disruption of a nerve as well as associated CT
what is axontmesis?
(lesion in continuity)
axonal disruption but supportive CT is maintained
what are some causes of axontmesis?
prolonged compression
traction
ischemia
toxins
what is neuropraxis?
(transient block) - a disruption of the myelin sheath
Sunderlan’ds classifcation of second degree (Class 2) is what in Seddon?
regeneration to Seddon’s axonotmesis
Sunderlan’ds classification of 1st degree (Class 1) is equivalent to what in Seddon?
neuropraxia
what happens in first degree (class 1) of sunderland?
conduction deficit w/o axonal interruption
Neuropraxia
what happens in 2nd degree (class 2) of sunderland?
(axontmesis)
- axon severed w/o breaching endoneurium
in which sunderland classification is the endoneurium lesioned?
third degree (class 2)
what happens in fourth degree (class 2)?
only epineurium remains intact
injury requires surgical repair
what is the complete transection of nerve called in Sunderland classification?
fifth degree (Class 3)
what nerve is impinged in the tarsal tunnel?
tibial nerve
what nerve is iminpinged in adductor canal?
saphenous nerve
what nerve is impinged around fibular head?
common peroneal nerve
what nerve is impinged around lateral malleolus?
sural nerve
what nerve is impinged around the deep fascia proximal to ankle?
superficial peroneal nerve
what are the borders to tarsal tunnel?
anterior- tibia
lateral- talus & calcaneus
medial- flexor retinaculum
what does an MRI show you with tarsal tunnel presentation?
space-occupying lesion possibly
