Neural Biomechanics

Question 1

Movements increase size of IVF

Answer 1

flexion
rotation away
side flexion away

Question 2

Normal nerve movement

Answer 2

tolerate compression
slide in container
withstand tension

Question 3

Tolerate Compression

Answer 3

should change shape when pressure is exerted on them
deformation with normal movement
spongy quality from epineurium

Question 4

Slide in container

Answer 4

both inter and intraneural sliding 
longitudinal and transverse sliding 
sliding occurs relevant to adjacent structures 
dissipates tension 
provided by the mesoneurium

Question 5

Withstand Tension

Answer 5

multiple joint tension results in increased tension
sliding potential used up results in nerve stretching
can have 20% strain before nerve compromised
at 8% elongation, blood supply is compromised - impacts function, can cause ischaemic pain
excessive tension can inhibit axonal transport
mechanical sensitivity and disruption occurs mainly with tension

Question 6

What causes nerve tension?

Answer 6

Impaired sliding 
- insufficient IVF opening 
- excessive IVF closing 
Decreased interneural sliding 
- nerve may become fibrotic 
Excessive tensioning 
- pre-tensioning at remote sites