5. Wrist bones Flashcards Preview

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Flashcards in 5. Wrist bones Deck (25)
1

Wrist bones - names

1. scaphoid
2. lunate
3. triquetrum
4. pisiform
5. Hamate
6. Capitate
7.Trapezoid
8. Trapezium

2

Wrist bones - 1st series ( lateral to medial )

1. scaphoid
2. lunate
3. triquetrum
4. pisiform

3

Wrist bones - 2nd series ( lateral to medial )

5. Hamate
6. Capitate
7.Trapezoid
8. Trapezium

4

radius is attached to ( wrist)

scaphoid and lunate

5

scaphoid is palpated in ( area)

anatomic snuff box

6

most commonly fractured of the carpal bone ( typically how)

scaphoid - typically from a fall on an outstreched hand

7

scaphoid fracture is prone to ( why )

avascular necrosis owing to retrograde blood suppy

8

dislocation of lunate may cause

acute carpal tunnel syndrome

9

a fall on an outstretched hand that damages the hook of the hamate can cause

ulnar nerve injury

10

Carpal tunnel syndrome - nerve ?

median nerve

11

Carpal tunnel syndrome - mechanism

entrapment of median nerve in carpal tunnel ---> nerve compression

12

Carpal tunnel syndrome - symptoms

1. pain
2. paresthesia
3 numbness (in distribution of median nerve)

13

Carpal tunnel syndrome is associated with

1. pregnancy
2. RA
3. hypothyroidism
4. repetitive use
5. dislocation of lunate ( acute Carpal tunnel syndrome)
6. diabetes
7. dialysis related amyloidosis

14

Guyon canal syndrome ?

compression of ulnar nerve at wrist or hand

15

Guyon canal syndrome is classically seen in (why)

cyclists due to pressure from handlebars

16

Carpal tunnel syndrome

- atrophy
- sensation spared, because palmar cutaneous branches enters the hand extrernal to carpal tunel

17

ACL - anatomy

extends from lateral femoral condyle to anterior tibia

18

PCL - anatomy

extends from medial femoral condyle to posterior tibia

19

• Name the carpal bones of the wrist (this does not include related bones of the radius and ulna).

Scaphoid, Lunate, Triquetrum, Pisiform, Hamate, Capitate, Trapezoid, Trapezium (So Long To Pinky, Here Comes The Thumb)

20

• Which carpal bone is most prone to avascular necrosis? Why?

Scaphoid; because of retrograde blood supply

21

• A man slips and hurts his wrist. His lateral palm is later noted to have diminished sensation. Which nerve was likely injured?

The median nerve (due to dislocation of the lunate), causing an acute carpal tunnel syndrome

22

• A pianist complains of pain and occasional numbness in his thumbs and index fingers, a problem likely caused by what?

Carpal tunnel syndrome (entrapment of the median nerve in the carpal tunnel)

23

• A bicyclist complains of paresthesias and decreased pinch strength in his pinky. What syndrome do you suspect?

Guyon canal syndrome, causing ulnar nerve injury

24

• Name some conditions that can predispose a patient to carpal tunnel syndrome.

Pregnancy, rheumatoid arthritis, hypothyroidism, repetitive use

25

• A man falls on his outstretched hand and experiences sensory deficits in his 4th and 5th digits. Which bone in the wrist was likely damaged?

The hook of the hamate, leading to ulnar nerve injury

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