Entrapment Neuropathies Flashcards Preview

Biomechanics & Surgery Exam 3 > Entrapment Neuropathies > Flashcards

Flashcards in Entrapment Neuropathies Deck (21):
1

What is Seddon's classification used to describe?

nerve injury

2

what are the 3 parts to Seddon's classification?

1. neurotmesis
2. axontmesis
3. neuropraxia

3

which is the most devastating nerve injury?

neurotmesis - implies compelte disruption of a nerve as well as associated CT

4

what is neurotmesis?

(Nerve division) implies complete disruption of a nerve as well as associated CT

5

what is axontmesis?

(lesion in continuity)
axonal disruption but supportive CT is maintained

6

what are some causes of axontmesis?

prolonged compression
traction
ischemia
toxins

7

what is neuropraxis?

(transient block) - a disruption of the myelin sheath

8

Sunderlan'ds classifcation of second degree (Class 2) is what in Seddon?

regeneration to Seddon's axonotmesis

9

Sunderlan'ds classification of 1st degree (Class 1) is equivalent to what in Seddon?

neuropraxia

10

what happens in first degree (class 1) of sunderland?

conduction deficit w/o axonal interruption
(Neuropraxia)

11

what happens in 2nd degree (class 2) of sunderland?

(axontmesis)
-axon severed w/o breaching endoneurium

12

in which sunderland classification is the endoneurium lesioned?

third degree (class 2)

13

what happens in fourth degree (class 2)?

only epineurium remains intact
injury requires surgical repair

14

what is the complete transection of nerve called in Sunderland classification?

fifth degree (Class 3)

15

what nerve is impinged in the tarsal tunnel?

tibial nerve

16

what nerve is iminpinged in adductor canal?

saphenous nerve

17

what nerve is impinged around fibular head?

common peroneal nerve

18

what nerve is impinged around lateral malleolus?

sural nerve

19

what nerve is impinged around the deep fascia proximal to ankle?

superficial peroneal nerve

20

what are the borders to tarsal tunnel?

anterior- tibia
lateral- talus & calcaneus
medial- flexor retinaculum

21

what does an MRI show you with tarsal tunnel presentation?

space-occupying lesion possibly