Wrist A&P

Question 1

how many bones in wrist and hand?

Answer 1

29

Question 2

distal radio-ulnar joint open pack

Answer 2

10 deg sup

Question 3

distal radio-ulnar joint closed pack

Answer 3

5 deg sup

Question 4

(+) ulnar variance

Answer 4

ulna >2 mm distal to radius (longer)

Question 5

(-) ulnar variance

Answer 5

ulna >2 mm proximal to radius (shorter)

Question 6

a gymnast is likely to have a ___ ulnar variance

Answer 6

+

Question 7

radio-carpal joint open pack

Answer 7

neutral with slight ulnar deviation

Question 8

radio-carpal joint closed pack

Answer 8

full ext w/ rad dev

Question 9

intercarpal joints closed pack

Answer 9

full ext

Question 10

intercarpal joints open pack

Answer 10

neutral to slight flexion

Question 11

which joints have no active structures?

Answer 11

intercarpal joints
midcarpal joints
CMC joints of fingers 2-5

Question 12

midcarpal joints closed pack

Answer 12

full ext w/ ulnar dev

Question 13

midcarpal joints open pack

Answer 13

neutral to slight flex w/ ulnar dev

Question 14

1st CMC open pack

Answer 14

midway b/w abd & add and flex & ext

Question 15

1st CMC closed pack

Answer 15

full opposition

Question 16

capsular pattern of 1st CMC

Answer 16

abd > ext

Question 17

CMC 2-5 open pack

Answer 17

midway b/w flex & ext

Question 18

CMC 2-5 closed pack

Answer 18

full flex

Question 19

which CMC joint are mobile vs immobile?

Answer 19

mobile: 4-5 (grasping)
immobile:2-3

Question 20

MCP open pack

Answer 20

slight flexion

Question 21

MCP closed pack

Answer 21

full opposition (1st)
full flexion (2-5)

Question 22

PIP & DIP open vs closed pack

Answer 22

open: slight flex
closed: full ext

Question 23

which wrist ligaments are strongest for grasping?

Answer 23

palmar (volar) ligs

Question 24

what is the most important ligaments for wrist motion & stability?

Answer 24

palmar radio-carpal ligs

Question 25

T/F: there are interosseous ligs b/w distal and proximal carpal rows

Answer 25

F

Question 26

when TFCC removed, the radius bears ___% of axial load

Answer 26

95% (normal = 80%)

Question 27

purpose of extensor & flexor retinaculum

Answer 27

prevent bowstringing

Question 28

which have pulleys: flexors or extensor tendons

Answer 28

flexors (round tendons)

Question 29

shape of extensor tendons?

Answer 29

flat

Question 30

which carpal bones are in the snuff box?

Answer 30

scaphoid** & trapezium

Question 31

what is in the carpal tunnel?

Answer 31

median nerve FDP FDS FPL

Question 32

which part of the median nerve does NOT pass through the carpal tunnel?

Answer 32

palmar branch

Question 33

atrophy in the ___ mm can be seen with carpal tunnel or median n palsy

Answer 33

thenar

Question 34

what mm are innervated by median n?

Answer 34

LOAF lateral 2 lumbricals opponens pollicis abd pol brevis flex pol brevis

Question 35

what atrophy is seen with ulnar n issues?

Answer 35

hypothenar & interossei

Question 36

which nerve supplied movements for more fine motorcontrol?

Answer 36

ulnar

Question 37

what is the key joint of the hand?

Answer 37

wrist (total ROM greater than sum of parts)

Question 38

1st CMC glides

Answer 38

abd & add: opposite flex & ext: same