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