Adverse Neurodynamics Flashcards

1
Q

Name some indications that pathology may include peripheral nerve involvement.

A

i) pain is radiating/radiculopathy
ii) positionall (“spontaneous”) and common movement aggravators
iii) burning, numbness, shooting quality
iv) neurofatiguable weakness
v) sensory changes

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2
Q

Explain what is meant by the term mechanosensitivity.

A

When exposed to mechanical stresses, periperal nerves increase in mechanosensitivity. This means symptoms are easier to reproduce (lower threshold) when the nerve is under the same stresses.

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3
Q

List three mechanical stresses that can produce symptoms in a peripheral nerve.

A

i) tension
ii) compression
iii) friction

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4
Q

Explain what a mechanical interface is with regard to neurodynamics.

A

Areas where nerves contact other structures. In these areas they can be compressed by these structures or tethered to them. Ex. flexor retinaculum and median nerve, fibular head and common peroneal nerve.

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5
Q

List the three membranous layers of a peripheral nerve in order from superficial to deep.

A

i) epineurium (separates fascicles)
ii) perineurium (surrounds fascicles)
iii) endoneurium (separates fibres)

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6
Q

Name three key identifiers of the epineurium.

A

i) facilitates gliding between fascicles
ii) consist of longitudinally aligned collagen
iii) highly reactive to injury

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7
Q

Name three key identifiers of the perineurium

A

i) consists of collagen and elastin
ii) diffusion barrier
iii) mechanical barrier to external forces

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8
Q

Name two key identifiers of the endoneurium.

A

i) consists of collagen

ii) maintains environment around nerve fibre (requires positive pressure!)

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9
Q

What factors contribute to variation of clinical presentation in peripheral nerve pathology.

A

i) vascular considerations (pressure gradient)
ii) mechanical considerations (friction, compression etc.)
iii) influence on axoplasmic flow
iv) extent of fibrosis

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10
Q

Describe the pressure gradient between a peripheral nerve and the nerve bed (surrounds nerve fibre).

A

P artery > P nerve fibre > P vein > P nerve bed.

Note: changes affect nutrition and nerve health.

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11
Q

What are the adverse effects of altered axonoplasmic flow in a peripheral nerve?

A

i) change in action potential (mechanosensitivity)
ii) altered structural integrity of axon and cell body
iii) trophic changes in target tissue (ex. skin/nails)
iv) compromised nerve conduction

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12
Q

What is necessary for normal axonoplasmic flow in a peripheral nerve?

A

i) adequate blood flow

ii) energy to consume

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13
Q

At which sites can fibrosis occur in peripheral nerve pathology?

A

i) between collagen fibres of a layer

ii) between membranous layers (ex. epineurium)

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14
Q

Explain the consequences of peripheral nerve fibrosis.

A

There will be decreased neural mobility in that area which will affect the neurodynamics of that nerve at other sites.

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15
Q

What is the distinction between an intraneural and extraneural pathology?

A

Extraneural pathologies involve the epineurium (ex. tethering to surround structures). Intraneural pathologies Intraneural pathologies involve structures within the nerve (ex. demyelination, neuroma).

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16
Q

How are extraneural and intraneural pathologies assessed, respectively?

A

i) extraneural pathologies are assessed by neurodynamic testing
ii) intraneural pathologies are assessed by conduction tests AND/OR neurodynamic tests (alter elasticity). However, conduction and is more commonly affected.

17
Q

If a patient presents with combined intraneural and extraneural pathology, which should be addressed first?

A

Whichever is the predominant cause of disability. Although, both will need to be addressed eventually.

18
Q

Explain what is meant by the term “double crush syndrome”.

A

An injury in one area of a nerve pathway increases sensitivity and likelihood of symptoms in another area of the pathway (ex. C6 dermatome and carpal tunnel syndrome).

19
Q

What constitutes a positive with regard to neurodynamic testing?

A

i) pt resistance to further ROM
ii) reproduction of symptoms
iii) asymmetrical ROM restriction on affected side

20
Q

Why are sensitivity and irritability particularly relevant in assessing and treating nerve pathology?

A

Latency effect: nerve tissue symptoms often peak long after mechanical stress is applied.

21
Q

Describe techniques to minimize the risk of causing an adverse latent effect.

A

i) start with area of nerve pathway well removed from area of symptoms
ii) avoid mobilizing into symptom production
iii) always follow up and modify HEP as needed

22
Q

Explain what a “slider” treatment technique entails. When is it indicated?

A

Movements of the body that primarily induce movement of a peripheral nerve relative to its surroundings. This allows for larger excursion and lesser strain on the nerve. This is indicated if there is resistance to movement moreso than tension intolerance.

23
Q

What are the benefits of neural “sliding” techniques?

A

i) dispersion of inflammatory products

ii) limit fibrotic changes (theoretical)

24
Q

Explain what a “tensioner” treatment technique entails.

A

Movement of the body that primarily induces tension on the nerve. This increases strain on the nerve thereby increasing intraneural pressure.

25
Q

Which mobilization grading system is best used for oscillatory neural treatments?

A

Maitland.

26
Q

What are the benefits of neural “tensioning” techniques?

A

i) improves nerve hydration and nutrition
ii) stimulate circulation (pumping effect) to reduce intraneural swelling
iii) most useful in the chronic stages of healing.