Wrist and Hand Structure and Movement

Question 1

What are the carpal bones of the hand (both rows)

Answer 1

Proximal row = scaphoid, lunate, triquetrum, pisiform
Distal row = Trapezium, trapezoid, capitate, hamate
(some lovers try positions that they cannot handle)

Question 2

What is the most easily fractured bone of the wrist??

Answer 2

The scaphoid - often fracture by forced extension of the wrist during a fall on an outstretched
hand (FOOSH)
The blood supply of the scaphoid is poor. If the fracture is not recognized and managed appropriately, it can heal improperly (non-union) and result in persistent wrist pain

Question 3

Most easily dislocated bone of the wrist

Answer 3

Lunate - often caused by forced flexion of the wrist during a fall

Question 4

Articulating bones and the diarthrodial joint subdivision of the midcarpal joint

Answer 4

Articulating bones
* Articulations between the proximal and distal carpal rows
Diarthrodial joint subdivision
* Nonaxial irregular (plane) type synovial

Question 5

Articulating bones and the diarthrodial joint subdivision of the CMC joint

Answer 5

• 1st (thumb) carpometacarpal joint
• Biaxial saddle type synovial joint
• 2nd-5th CMC joints
• Nonaxial irregular (plane) type synovial joints

Question 6

Articulating bones and the diarthrodial joint subdivision of the metacarpophalangeal joints

Answer 6

Articulating bones
* Metacarpal heads
* Bases of the proximal phalanges
Diarthrodial joint subdivision
* Biaxial condyloid type synovial joints

Question 7

3 main ligaments at all MCP and IP joints

Answer 7

Ulnar collateral ligament, radial collateral ligament, and volar (palmar) plate (ligament)

Question 8

What is the main function of the collateral ligaments of the fingers

Answer 8

Providing mediolateral stability to the MCP and IP joints

Question 9

Function of the volar (palmar) plate

Answer 9

Prevents excessive extension of the MCP and IP joints

Question 10

Articulating bones and the diarthrodial joint subdivision of the 1st carpometacarpal joint

Answer 10

Articulating bones
* Trapezium carpal bone
* Base of the first metacarpal
Diarthrodial joint subdivision
* Biaxial saddle type synovial joint