nerve tissue responds to movement by
gliding
lengthening
compression (from surrounding tissues)
Adverse neural tension
Abnormal physiological or mechanical response from the nervous system that:
Limits the range/stretch of neurologic tissue
Results in neurologic symptoms through available range
3 tension sites where dura is tethered to bony canal
C6
T6
L4
Adhesions results in decreased dural or neural mobility and increased distances for the tissue to travel. t/f
T
tunnels
increase the probability of spatial compromise of n.
nerve can rub on tunnel surface and creates friction and any trauma to tunnel structure compromise nerve
branches
more difficult for n to move away from forces at those points where a nerve branches
ex: radial n at elbow
hard interfaces
Nerve more readily compressed if it lies on a bone or passes through fascia (i.e. radial nerve in spinal groove of humerus)
proximity to surface
Superficial nerves, such as sensory radial nerve in forearm, are more vulnerable to external compression
Adherence to interfacing structures
Some areas of nerve are more firmly adherent to interfacing tissues than others (i.e. the common fibular nerve at head of fibula)
3 signs of + NPT
Reproduces pt’s symptoms (concordant pain)
Test responses altered by movement of distant body parts that would not be attributable to any other tissue except neural tissue (i.e. sensitization)
Test differences from L side to R side or from normal (i.e. differences in pain, ROM)
ULTT 2
(radial n. dominant)
ULTT 3
(ulnar n. dominant)
Double Crush injuries
Condition composed of neurologic dysfunction d/t compressive pathology at multiple sites
May impair a nerve’s ability to withstand compression at distal site
Used to explain many co-existing proximal and distal impairments
NPT necessary to determine sites and severity of nerve compression
Clinical examples:
Cervical radiculopathy and CTS
Cervical radiculopathy and cubital tunnel syndrome