Wrist and Hand Kinesiology

Question 1

Two degrees of freedom

Answer 1

Extension/Flexion
Radial/Ulnar deviation

Question 2

Axis of rotation

Answer 2

Capitate (doesn’t stay fixed)

Question 3

Sagittal plane motion

Answer 3

Total arc: 130-160
Flexion: ~ 70-85
Extension: ~ 60-75

Question 4

Frontal plane motion

Answer 4

Total arc: 50-60
Radial deviation: ~ 15-20
Ulnar deviation: ~ 35-40

Ulnar is greater due to TFCC allowing for more motion and radial styloid blocking radial motion

Question 5

Functional wrist ROM

Answer 5

Flexion: 40
Extension: 40
Radial dev: 10
Ulnar dev: 30

Question 6

Central column two joint model

Answer 6

Midcarpal and radiocarpal joint for flexion and extension arthokinematics
Roll (capitate) and slide (lunate) opposites

Radial and ulnar deviation arthokinematics
Roll (capitate and hamate) and slide (triquetrum, lunate and scaphoid) opposite
Ulnar is firm end feel, Radial is hard end feel

Question 7

Limits to central column two joint model

Answer 7

Does include flexion and extension during radial and ulnar deviation of proximal carpals

Question 8

Row Theory

Answer 8

Wrist flexion and extension occurs between proximal and distal carpals
Radial and ulnar dev occurs at scaphoid and radius

Question 9

Thumb carpometacarpal joint

Answer 9

Classic saddle joint
Trapezium is concave along the longitudinal length and convex along the transverse length
First metacarpal is convex longitudinally, and concave along the transverse length.

Abduction and adduction: roll (met) and slide (trap) is opposite
Flexion and extension: roll (trap) and slide (met) is same direction

Question 10

Opposition of thumb

Answer 10

Combination of CMC abduction and flexion