Wrist + Finger joints

Question 1

4 main articulations

Answer 1

1. b/w the carpals + distal forearm = radiocarpal joint
2. b/w the proximal + distal carpal rows = midcarpal joint
3. b/w the indiv carpal bones = intercarpal joints
4. b/w the carpals + metacarpals = CMC joints

Question 2

Radiocarpal joint

Answer 2

Classification:
- Synovial, ellipsoid, biaxial
Surfaces:
- Proximal surface = distal radius + articular disc (covering distal ulna)
- Distal surface = proximal carpal row
Movements:
- Flexion, extension, radial + ulnar deviation

Question 3

Midcarpal Joint

Answer 3

Classification:
- Synovial, ellipsoid, biaxial
Surfaces:
- joint formed b/w the proximal + distal carpal rows (except pisiform)
Movements:
- Flexion, extension, radial + ulnar deviation

Question 4

Intercarpal joints

Answer 4

Classification:
- Synovial, plane, multiaxial 
Surfaces:
- articulations b/w indiv carpal bones
- bound together by ligs - interosseous ligs b/w the bones, as well as a no. of dorsal + palmar ligs

Question 5

Common Carpometacarpal joints (CMC)

Answer 5

Classification:
- Synovial, plane, multiaxial
Surfaces:
- joint formed b/w the MC + distal carpal row
Movements:
- progressive increase in range of movt from the 2nd to the 5th CMC joint

Question 6

1st CMC joint

Answer 6

Classification:
- Synovial, saddle, biaxial
Surfaces:
- base of the first MC + the trapezium carpal bone
Movements:
- Flexion + extension = in the plane of the palm of the hand
- abduction + adduction = perpendicular to the palm of the hand
- opposition (combination) = pad to pad approximation

OTHER INFO:

• reciprocally shaped concave bony surface
• stability provided by bony shapes (congruity) + surrounding ligs

Question 7

Metacarpophalangeal (MCP) joints

Answer 7

Classification:
- Synovial, condyloid, biaxial
Surfaces:
- head of the MC articulates w/ the base of the proximal phalanx
Movements:
- Flexion, extension, abduction, adduction

Question 8

Interphalangeal (IP) joints

Answer 8

Classification:
- Synovial, hinge, uniaxial 
Surfaces:
- b/w the (distal + middle) + (middle + proximal) phalanges (only b/w distal + proximal for thumb)
Movements:
- Flexion, extension

• Have DIP’s + PIP’s

Question 9

Triangular Fibrocartilage Complex (TFCC)

Answer 9

• Load-bearing b/w lunate, triquetrum + ulna
• Stabiliser for distal R/U joint
• Is a space occupier (as ulna is not as long as radius) = fills the space b/w the ulna + triquetrum
• has a palmar + dorsal radioulnar ligament