Orthopaedics > Hand > Flashcards

Hand Flashcards

(37 cards)

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1
Q

What is the name for damage to C8/T1 at the brachial plexus?

A

Klumpke’s paralysis

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2
Q

What muscle groups are affected when there is damage to C5/6 at the brachial plexus?

A
  • Abductors and external rotators (–> waiters tip position)
  • This is Erb’s palsy
  • Associated with loss of sensation in C5/6 dermatomes
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3
Q

What muscles are affected when C8/T1 is damaged at the brachial plexus?

A
  • Small hand muscles paralysed –> claw hand
  • Loss of sensation in C8/T1 dermatomes
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4
Q

What is the name of a nerve injury affecting C5/6 at the brachial plexus?

A

Erb’s palsy

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5
Q

What is this sign?

A

Waiter’s tip (Erb’s palsy, C5/6)

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6
Q

What is this sign?

A
  • Claw hand (Klumpke’s palsy, C8/T1 brachial plexus injury)
  • Note the extension at MCPs and flexion at IPs
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7
Q

Which spinal nerves does the radial nerve carry fibres from?

A

C5-T1

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8
Q

What sign would you get if there was a fracture to the posterior interroseous nerve following a fracture around the elbow or forearm?

A

Finger drop due to loss of extension at CMC joint

No sensory loss

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9
Q

What nerve is at risk in a fracture of the elbow or forearm?

A

Posterior interosseous nerve- originates from radial nerve

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10
Q

What nerve is at risk if a fracture of the humerus affects the radial groove?

A

Radial nerve

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11
Q

What sign is this? What is the cause? Give 3 injuries that can cause this presentation

A

Wrist drop- due to radial nerve palsy after a shaft of humerus fracture or a high radial nerve injury (e.g. Saturday night palsy, crutches)

Associated with loss of sensation to dorsum of thumb root (snuff box)

Triceps function depends on injury site- v. high injury –> paralysis, fractures normally associated with normal triceps function

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12
Q

What spinal nerves supply the ulnar nerve?

A

C8-T1

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13
Q

What effect does an ulnar nerve lesion have?

A
  1. Paralysis of intrinsic muscles of hand –> ulnar claw hand (affecting ring and little finger)
  2. Weakness finger ab/adduction (due to interossei loss)
  3. Sensory loss over little finger
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14
Q

How would you test for an ulnar nerve lesion?

A
  • Froment’s sign- flexion of thumb IPJ when trying to hold onto paper between thumb and forefinger
    • Indicates weak adductor policis
  • Can’t cross fingers (for luck)
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15
Q

What is the ulnar paradox?

A
  • Ulnar nerve lesion at the elbow (i.e. higher up) has less clawing as FDP is paralysed –> decreased flexion of 4th/5th digits vs a lesion lower down where clawing will appear more severe.
  • NB Claw hand from ulnar nerve lesion involves extension of MCPs and flexion at IPs at 4th and 5th digit
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16
Q

What spinal nerve fibres supply the median nerve?

17
Q

What muscles does the median nerve supply?

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A

The LOAF muscles:

  • Lateral two lumbricals
  • Opponens pollicis
  • Abductor pollicis brevis
  • Flexor pollicis brevis

+ all muscles of forearm except flexor carpi ulnaris and ulnar half of FDP

18
Q

What is this sign? What is its cause? (I appreciate it says on the photo)

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A

Ape like hand

  • Median nerve damage
  • NB wasting of thenar eminence
  • Inability to oppose thumb
19
Q

What is this sign? When would you see it? What is the cause?

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A
  • Median nerve injury, inability to flex fingers at IPJ on attempting to make a fist
  • Can’t flex terminal thumb phalanx (FPL)
  • Loss of sensation in median nerve distribution
20
Q

Name the carpal bones

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A
  • Scaphoid
  • Lunate
  • Triquetrum
  • Pisiform
  • Trapezium
  • Trapezioid
  • Capitate
  • Hamate
21
Q

What makes up the roof of the carpal tunnel?

Study These Flashcards
A

The flexor retinaculum (rigid tendinous sheath)

22
Q

What makes up the floor of the carpal tunnel?

Study These Flashcards
A

The carpal bones

23
Q

What does the carpal tunnel contain?

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A
  • 9 tendons (all flexors!):
    • 4 tendons flexor digitorum superficialis
    • 4 tendons flexor digitorum profundus
    • 1 tendon flexor pollicis longus
  • The median nerve (supplies LOAF muscles)
24
Q

Which of these tendons passes through the carpal tunnel?:

  1. Opponens pollicis
  2. Flexor pollicis brevis
  3. Flexor pollicis longus
  4. Abductor pollicis longus
Study These Flashcards
A

3- flexor pollicis longus

Also the 4 tendons of flexor digitorum profundus and the 4 tendons of flexor digitorum superficialis

25
What is carpal tunnel syndrome?
Compression of the median nerve
26
Which gender is more commonly affected by carpal tunnel syndrome?
F \> M
27
Give the secondary causes of carpal tunnel syndrome
* **W**ater: Pregnancy, hypothyroid * **R**adial fracture * **I**nflammation: RA, gout * **S**oft tissue swelling: lipomas, acromegaly * **T**oxic: DM, ETOH
28
What special tests are there for carpal tunnel syndrome?
Phalen's and Tinel's | (reverse prayer) (tapping)
29
What is an early sign of irreversible damage in carpal tunnel syndrome?
Reduced two point touch discrimination
30
What investigations can be done to confirm a dx of carpal tunnel?
Nerve conduction studies and USS- not usually performed
31
Management of carpal tunnel syndrome
* Non-surgical: Manage underlying cause * Wrist splint: neutral position, especially at night or when carrying out movements that bring it on * local steroid injection * Surgical: decompression by flexor retinaculum division
32
Complications of carpal tunnel surgery?
* Scar formation: keloid/hypertrophic scars * Nerve injury: Palmar curaneous, motor branch to thenar muscles * Failure to relieve symptoms
33
What is Dupuytren's contracture?
Painless fibrotic thickening of palmar fascia
34
What joints are affected in Dupuytren's? What movement?
MCP and IP flexion
35
What are the 3 most common causes of Dupuytren's?
1. Idiopathic 2. Trauma 3. ETOH
36
What are some associations with Dupuytren's contracture?
* **B:** Bent penis- Peyronie's disease (3%) * **A**: AIDS * **D**: DM * **F**: FH- AD * **I**diopathic * **B**ooze**-** ALD * **E**pilepsy and meds e.g. phenytoin * **R**eidel's thyroiditis * **S**moking
37
Management Dupuytren's?
* Non-surgical: Physio * Surgical: Fasciectomy- Z plasty. Usually recurs, risks ulnar nerve
Orthopaedics
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