Chapter 18 - Forearm, Wrist and Hand

Question 1

How many bones, joints and ligaments are within the wrist?

Answer 1

Bones = 8
Joints = 20 radiocarpal, intercarpal & carpometacarpal joints
Intercarpal ligaments = 26 named

*also contains 6 or more parts of TFCC

Question 2

The hand accounts for _____% of UE function.

Answer 2

90

Question 3

What type of joint is the distal radioulnar joint?

Answer 3

Uniaxial pivot joint (joins dital radius, distal ulnar and TFCC)

Question 4

What is shape of the distal radius?

Answer 4

concave

Question 5

What is the capsular pattern of the DRUJ?

Answer 5

Pain at extremes of pronation/supination

Question 6

What is the resting and closed packed position of the DRUJ?

Answer 6

Resting = 10 supination
Closed = 5 supination

Question 7

What is the TFCC?

Answer 7

Fibrocartilage disk between medial proximal row and distal ulna

Question 8

What is the function of the TFCC?

Answer 8

• enhance joint congruity

- cushion against compressive forces

Question 9

What ligaments originate from the TFCC?

Answer 9

• ulnolunate
• ulnotriquetral
• ulnar collateral
• radioulnar

Question 10

What structures provide support for the TFCC?

Answer 10

• ulnocarpal ligaments

- sheath of ECU tendon

Question 11

Inferior and superior articular surfaces of the TFCC are ______ and ______.

Answer 11

Smooth and concave

Question 12

What type of joint is the radiocarpal joint?

Answer 12

Biaxial ellipsoid joint

Question 13

What is the capsular pattern of the radiocarpal joint?

Answer 13

Flexion and extension equally limited

Question 14

What are the resting and closed packed position of the radioulnar joint?

Answer 14

Resting = neutral with slight UD
Closed = extension with RD

Question 15

What does the lunate articulate with: medially, laterally, proximally, distally?

Answer 15

Medially = scaphoid
Laterally = triquetrum
Proximally = convex surface articulates with the radius and TFCC
Distally = concave surface articulates with hamate and capitate

Question 16

What does triquetrum articulate with: posterior surface of, laterally, distally, proximally?

Answer 16

Posterior surface of = pisiform
Laterally = lunate
Distally = hamate
Proximally = TFCC

Question 17

What attaches to the triquetrum?

Answer 17

UCL

Question 18

What does pisiform articulate with?

Answer 18

Triquetrum

Question 19

What type of bone is pisiform?

Answer 19

Sesamoid bone, formed within the tendon of the FCU

Question 20

What attaches to pisiform?

Answer 20

• flexor retinaculum
• abductor digit minimi
• UCL
• pisohamate ligament
• pisometacarpal ligament