Hand bones Flashcards Preview

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Flashcards in Hand bones Deck (35):
1

What do the bones of the hand provide?

Support and flexibility to the soft tissues

2

What can the bones of the hand be divided into?

Carpal bones 
Metacarpals 
Phalanges

3

What are the most proximal bones of the hand?

Carpal bones

4

What are the carpal bones?

A set of 8 irregularly shaped bones

5

Where are the carpal bones located?

In the wrist area

6

How many metacarpals are there?

5- one related to each digit

7

What are the phalanges?

The bones of the fingers

8

How many phalanges does each finger have?

3, apart from the thumb, which has two

9

How are the carpal bones organised?

Into two rows, proximal and distal

10

What are the carpal bones in the proximal row (lateral to medial)?

Scaphoid 
Lunate
Triquetrum 
Pisiform

11

What kind of bone is the pisiform?

A sesamoid bone

12

What is the pisiform formed with?

The tendon of the flexor carpi ulnaris

13

What are the carpal bones of the distal row (lateral to medial)?

Trapesium 
Trapezoid
Capitate 
Hamate

14

What does the hamate have?

A projection on its palmar surface, called the hook of hamate

15

What articulates with the radius proximally?

The scaphoid and lunate

16

What do the carpal bones in the distal row articulate with?

The metacarpals

17

What are the carpal bones most commonly fractured?

The scaphoid and lunate

18

What is the usual mechanism of injury for fracture of scaphoid and lunate?

FOOSH (falling on outstretched hand)

19

What is the classical clinical feature of a scaphoid fracture?

Pain and tenderness in the anatomical snuffbox

20

What needs to happen to a scaphoid fracture?

It needs to be reduced quickly

21

Why does a scaphoid fracture need to be reduced quickly?

As the blood supply to the proximal part of the bone can be cut off, causing it to undergo avascular necrosis

22

What are patients with a missed scaphoid fracture likely to develop?

Arthritis later in life

23

When does a lunate fracture occur?

When there is hyperextension at the wrist

24

What is a lunate fracture associated with?

Damage to the median nerve

25

What do the metacarpal bones articulate with?

Proximally, with carpals 
Distally, with proximal phalanges

26

What are the metacarpal bones?

Metacarpal I- thumb 
Metacarpal II- index finger 
Metacarpal III- middle finger
Metacarpal IV- ring finger 
Metacarpal V- little finger

27

What does each metacarpal consist of?

A base, shaft, and a head

28

What is true of the medial and lateral surfaces of the metacarpals?

They are concave

29

Why are the medial and lateral surfaces of the metacarpals concave?

Allowing attachment of the interoessei muscles

30

What are the common fractures of the metacarpals?

Boxer’s fracture 
Bennett’s fracture

31

What is the Boxer’s fracture?

A fracture of the 5th metacarpal neck

32

What is the Boxer’s fracture usually caused by?

A clenched fist striking a hard object

33

What happens in the Boxer’s fracture?

The distal part of the fracture is displaced posteriorly, producing a shortening of the affected finger

34

What is a Bennett’s fracture?

A fracture of the first metacarpal base, extending into the carpometacarpal joint

35

What is Bennett’s fracture caused by?

Hyperabduction of the thumb