Wrist Complex Biomechanics - 3 Flashcards Preview

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Flashcards in Wrist Complex Biomechanics - 3 Deck (50):
0

degrees of freedom at humeroulnar joint

one (hinge)

1

close chained movement of humeroulnar like hands on table causes blank to move instead of blank

ulna, radius

2

capitate is the blank of the hand to keep it blank

keystone, supported/stable

3

central pillar effect in hand is due to what bone

capitate

4

carpals allow blank movements

flexion/extension, ulnar/radial deviation

5

aaos flexion value

80

6

aaos extension value

70

7

radial deviation aaos value

20

8

ulnar deviation aaos value

30

9

rc joint has a single blank surface that accomodates forearm and hand position

biconvex

10

this is in the proximal carpal row and is a sesamoid bone but is not included in the rc joint

pisiform

11

fcu blank is increased by pisiform

moment arm

12

rc joint contributes to blank and blank more than blank and blank

flexion/ulnar dev, extension/radial dev

13

no blank act directly on the blank joint

rc

14

ic joints are between all blank bones

carpal

15

ic joints allow minimal movement to accomodate blank and blank positioning

hand/wrist

16

ic joints are bound by blank and have little give

ligaments

17

ic ulnar side is more blank than radial

mobile

18

blank ligaments are stronger than blank ligaments at ic joints hence why we extend wrists extinctively when we fall

palmar, dorsal

19

most commonly dislocated carpal due to instability palmarly

lunate

20

ganglion cyst formation occurs at the proximal pole of the scaphoid because it has no blank

ligament attachment dorsally

21

ligaments are blank movers

passive

22

most stable ligaments because there are 3 rather than one like on the dorsal aspect of hand

volar radiocarpal ligament

23

rc joint contributes more to blank than mc joint

flexion

24

mc joint contributes more to blank than rc joint

extension

25

rc joint is blank carpals moving on blank radius

convex, concave

26

flexion of rc joint is a palmar roll and blank glide

dorsal

27

extension of rc joint is a blank roll and palmar glide

dorsal

28

radial dev of rc joint is blank roll and blank glide

radial, ulnar

29

ulnar deviation is blank roll and blank glide

ulnar, radial

30

with flexion, the blank flexes, the blank and blank extend.... this is called blank which increases ligament tension and stability

scaphoid, lunate/triquetrum, counter rotation,

31

coming together of carpal articular surfaces increases blank

stability

32

extension causes scaphoid to blank, while blank and blank flex

extend, lunate, triquetrum

33

two halves of the blank joint

mc (midcarpal)

34

2 halves of mc joint

radial, ulnar

35

ulnar side of mc joint is blank hamate and capitate moving on blank lunate and triquetrum in frontal and sagittal planes

convex, concave

36

radial side of mc joint is blank trapezoid and trapezium moving on blank scaphoid in frontal and sagittal planes

concave, convex

37

blank deviation helps stability of rc and mc because they will be blank

radial, close packed

38

ulnar side of mc and the whole rc are linked blank

anatomically/functionally (vex on cave)

39

radial side of mc and the whole rc are linked blank

anatomically (cave on vex)

40

secondary wrist action is from muscles that cause movement at blank primarily

digits

41

origins/insertions pictures are well shown on the ppoint for lecture

ok

42

ecrb attaches at the 3rd digit at the base so its only job is to blank

exten

43

if ed was compensating for weak ecr, we would also get blank rather than just wrist extension

finger extension

44

adm originates at blank

pisiform

45

fcu contraction stabilizes blank to allow abduction of blank digit

pisiform, 5th

46

adaptive shortening in a quadraplegic allows for better blank

function

47

where adaptive shortening is good for function

tenodesis

48

example of tenodesis function

grabbing a cup

49

fcu and ecu allows pure ulnar deviation are blank

equal to each other