Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Biomechanics I > wrist osteology and arthrology > Flashcards

wrist osteology and arthrology Flashcards

(85 cards)

Start Studying
1
Q

where is lister’s tubercle located

A

dorsal radius

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

discribe the distal articular surface of the radius

A

concave in both ML and AP with facets in the articular surface

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

what is the ulna tilt and what is its importance

A

distal end radius 25 degrees toward ulna

allows more ulna dev than radial dev

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

why is radial dev less than ulna dev

A

carpals hit radial styloid process in radial dev

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

what is the significance of palmar tilt

A

10 degrees

allows for more flx than ext in wrist

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

what bones are included in the proximal row of the carpals

A

scaphoid, lunate, triquetrum, pisiform

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

what bones are included in the distal row of the carpals

A

trapezium, trapezoid, capitate, hamate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

what row of the carpals is more tightly bound

A

distal row

bound tightly by strong ligaments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

what type of joint is formed with the scaphoid and 4 other caprals

A

synovial

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

the proximal convex pole of the scaphoid articulates with what structure

A

radius

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

the distal convex pole of the scaphoid articulates with what structure

A

trapezium and trapezoid

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

the deep concavity of the scaphoid holds what structure

the small concavity holds what

A

capitate

lunate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

t/f
the scaphoid is most frequently fractured carpal

A

true

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

t/f
the scaphoid is most frequently fractured carpal

A

true

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

what is kienbocks disease

A

softening of the lunate AVN

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

describe the lunate

A

moon shaped
central bone in proximal row
fits into radius

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

t/f
the lunate is the most stable bone of the carpal bone

A

false
the lunate is the most commonly dislocated bone
most inherently unstable d/t lack of strong ligaments in capitate with no muscle attachments

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

descibe the triquetrum

A

triangular bone
most ulnar just distal to ulna
articular facet that accepts pisiform

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

describe the pisiform

A

shaped like a pea
loose articulation with triquetrum
acts like a sesamoid bone

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

what tendon is the pisiform embedded in

A

FCU tendon

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

what attaches at the pisiform

A

abd digiti minimi, transverse carpal ligament

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

describe the capitate

A

largest, central carpal bone
articulates with 7 carpal bones

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

t/f
the capitate is well stabilized by short strong ligaments

A

true

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

what bone concavities does the capitate articulate with

A

scaphoid and lunate

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
describe the trapezium
asymmetrical concave at scaphoid distal saddle like surface
26
what attaches at the trapezium tubercle
transverse carpal ligament
27
describe the trapezoid
small wedged between capitate and trapezium firm attachment to 2nd metacarpal
28
describe the hamate
large hooklike process located at base of 4/5 metacarpals
29
what attaches at the hamate
transverse carpal ligament
30
what is the functional mobility of the hamate
cupped hand
31
what is carpal tunnel made up of what is its function
thick fibrous band of connective tissue - transverse carpal ligament attachment site for man intrinsic muscles on the hand and palmaris longus
32
what are the 4 raised points that the carpal tunnel connects
pisiform hook of hamate tubercle of scaphoid tubercle of trapezium
33
describe the radiocarpal joint
concave radius/disc and convex scaphoid/lunate
34
where is the highest contact of the radiocarpal joint
at slight extension and ulnar dev
35
describe the midcarpal joint
between prox and distal rows continuous capsule
36
t/f the midcarpal joint allows for more medial movement than lateral
true
37
how many intercarpal joints are there
13 joints
38
where are extrinsic ligaments of the wrist located
from radius or ulna
39
where are intrinsic ligaments of the wrist located
within wrist
40
____ surrounds wrist and distal radioulnar joint
fibrous capsule
41
t/f no ligaments are embedded in fibrous capsule of the wrist
false ligaments are embedded in fibrous capsule of the wrist
42
where is the triangular fibrocartilage complex (TFCC) located
space between pisiform/triquetrum, lunate, and ulna
43
how many degrees of freedom is in the wrist what are they
2 degrees of freedom flx-ext, ulnar-radial deviaiton
44
is wrist circumduction a 3rd degree of freedom
no, combo of flx/ext and ulnar/radial dev
45
where is the axis located of wrist movement
head of capitate
46
what is the plane of motion of wrist flx/ext
ML
47
what is the plane of motion of radial/ulnar deviation
AP
48
the rotation of the ___ directs the osteokinematics of entire hand
capitate
49
how many degrees is normal for sagittal plane motion of the wrist
flexion: 0-75/85 extension: 0-60/75
50
t/f higher than average palmar tilt of radius does not affect wrist extension
false higher than average palmar tilt of radius may limit extension
51
what are normal degrees of motion in the frontal plan for the wrist
radial dev: 50-60 ulnar deviation: 0-35/40 and 0-15/20
52
what range of motion is needed for wrist ADLs flx/ext: radial dev: ulnar dev:
flx/ext: 40 degrees each radial dev: 10 degrees ulnar dev: 30 degrees
53
what motion naturally occurs with radial dev
wrist extension
54
what motion naturally occurs with ulnar dev
wrist flexion
55
describe the arthrokinematics of wrist extension
convex lunate rolls dorsally and slides in a palmar direction head of capitate rolls dorsally on lunate and slides in palmar direction
56
describe the arthrokinematics of wrist flexion
convex lunate rolls palmar direction and slides dorsally head of capitate rolls palmar direction on lunate and slides in dorsally
57
wrist arthrokinematics is driven by ___ but guided/controlled by passive tension within the ____
muscles ligaments
58
describe the motions of the scaphoid, lunate, and triquetrum motion during ulnar dev
scaphoid, lunate, triquetrum roll in ulnar direction and slide radially
59
describe the arthrokinematics of the scaphoid, lunate, and triquetrum motion during radial dev
scaphoid, lunate, and triquetrum roll in radial direction and slide in ulnar direction
60
what joint is responsible for 80% of the motion of radial dev
MC joint
61
carpal instability is most commonly due to...
usually lax or ruptured ligaments
62
what is the most frequently dislocated carpal bone
lunate
63
what muscles are innervated by the radial nerve
all muscles that cross the dorsal side of the wrist ECRB ECRL ECU
64
what muscles are innervated by the medial and ulanr nerve
all muscles that cross the palmar side of the wrist FCR, PL - median FCU - ulnar
65
what is the sensory innervation of the RC and MC joints
RC - C6, C7 MC - C6-C8
66
list the primary wrist extensors that act on only wrist
extensor carpi radialis longus extensor carpi radialis brevis extensor carpi ulnaris
67
list the secondary wrist extensors that act on the wrist and hand
extensor digitorum extensor indicis extensor digiti minimi extensor pollicis longus
68
what secures extensor tendons in place
extensor retinaculum
69
what is de quervain's tenosynovitis located
compartment 1
70
contraction of the extrinsic finger flexors flexes the fingers and creates a ___ ___ torque
wrist flexion torque
71
what muscles block the wrist flexion caused by activation of finger flexor muscles
wrist extensors
72
what is the length-tensor relationship of the wrist
wrist extensors maintain optimal length of the finger flexors to effectively flex fingers
73
maximal grip force occurs at about __ degrees of extension
30 degrees
74
what population most commonly has lateral epicondylitis
hammering tennis players
75
what symptoms are common with lateral epicondylitis
painful/weak grip pain with passive wrist flexion and pronation tenderness over lateral epicondyle
76
list the primary wrist flexors
flexor carpi ulnaris flexor carpi radialis palmaris longus
77
what are the secondary wrist flexors
flexor digitorum profundus flexor digitorum superficialis flexor pollicis longus abductor pollicis longus extensor pollicis longus
78
what is the function of the palmar carpal ligament
stabilizes/prevents bowstringing
79
what muscle has the highest wrist flexion torque of all 3 flexors
flexor carpi ulnaris
80
what 2 muscles work together as synergists to oppose deviations
flexor carpi ulnaris and flexor carpi radialis
81
t/f wrist flexors are able to produce 70% higher isometric torque than extensors
true
82
peak wrist flexion torque is at __ degrees flexion
40
83
peak extension torque is at __ - __ degrees of extension
30-70
84
what muscles act to radial deviate
extensor carpi radialis brevis extensor carpi radialis longus abductor pollicis longus extensor pollicis longus extensor pollicis brevis flexor carpi radialis flexor pollicis longus
85
what muscles act to ulanr deviate
extensor carpi ulnaris flexor carpi ulnaris flexor digitorum profundus flexor digitorum superficialis extensor digitorum

Biomechanics I (4 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions