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Movement Science 1 > The Wrist Complex > Flashcards

The Wrist Complex Flashcards

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1
Q

what two compound joints make up the wrist complex?

A

radiocarpal
midcarpal

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2
Q

The wrist complex contributes to ________ relationship in multiarticular hand muscles and also what?

A

The wrist complex contributes to length tension relationship in multiarticular hand muscles and also FINE ADJUSTMENT OF GRIP

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3
Q

structure and biomechanics of wrist/hand are the same from person to person (true or false)

A

false: vary from person to person
subtle variations cause differences in way function occurs

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4
Q

wrist complex is a ____ joint with ____ degrees of freedom

A

biaxial joint with 2 degrees of freedom
flexion/extension
radial and ulnar deviation

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5
Q

what wrist motions occur in the coronal axis?

A

flexion and extension

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6
Q

in the coronal axis, wrist flexion is __ to ___ degrees

A

65-85 degrees of flexion

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7
Q

in the coronal axis, wrist extension is ___ to ___ degrees

A

60-85 degrees of extension

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8
Q

is there more degrees flexion or extension in the wrist?

A

More flexion (65-85 compared to extension: 60-85) ((in EEO, wrist flexion is 80, extension is 70))

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9
Q

volar/palmar refers to what wrist motion?

A

flexion

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10
Q

dorsal/dorsum refers to what wrist motion?

A

extension

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11
Q

radiocarpal joint is formed by ___ and ____ proximally and ___, _____, ____ distally

A

proximal radiocarpal joint: radius and TFCC
distal radiocarpal joint: scaphoid, lunate, triquetrum

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12
Q

proximal radiocarpal joint segment:
The lateral radial facet articulates with the _____

A

scaphoid

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13
Q

proximal segment: the medial radial facet articulates with the _____

A

lunate

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14
Q

Proximal segment: the TFCC articulates with the _______

A

triquetrum

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15
Q

How is the radius angled at the radiocarpal joint?

A

oblique and angled volarly in the sagittal plane/ulnarly in the frontal plane

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16
Q

TFCC connects medially via ____ and ____ ligaments

A

TFCC connects medially via dorsal and volar radioulnar ligaments

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17
Q

TFCC connects distally to what four things?

A

ECU tendon
triquetrum
hamate
base of 5th metacarpal

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18
Q

In the radiocarpal joint, the proximal carpal row includes what 3 carpals?

A

scaphoid, lunate, and triquetrum

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19
Q

The proximal carpal row is connected by what interosseous ligaments?

A

scapholunate interosseous ligament and lunotriquetral interosseous ligament

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20
Q

The pisiform does not support the radius!
Works as a sesamoid bone to increase the moment arm for which tendon?

A

Flexor Carpi Ulnaris (FCU)

21
Q

The _____ radiocarpal segment is sharper than the _____ radiocarpal segment (proximal vs. distal)

A

distal radiocarpal segment is sharper than the proximal segment, making an INCONGRUENT JOINT

22
Q

The scaphoid and lunate receive ____% of the axial load of the wrist

A

80%

23
Q

The TFCC receives ___% of the axial load of the wrist

A

20% of the wrist load

24
Q

Is the dorsal radius slightly longer than the volar radius?

A

YES (tilted volarly)

25
Q

An ulna negative variance means length of the ulna is ____

A

short

26
Q

radiocarpal joint incongruence and angle of proximal joint surface results in greater range of ____ than _____ (extension/flexion) and radiocarpal _____ deviation (ulnar/radial)

A

greater flexion than extension, greater ulnar deviation than radial deviation

27
Q

ulnar positive variance means distal ulnar length is _____ compared to radius

A

long ulna

28
Q

ulnar positive variance is associated with

A

radial fracture (may surgically use ulnar shortening to decrease pain)

29
Q

ulnar negative variance is associated with what?

A

avascular necrosis of lunate (keinböcks disease)
*due to abnormal force distribution and thicker TFCC

30
Q

ulnar positive variance is often accompanied by ____ impingement

A

TFCC impingement between distal ulna and triquetrum (thinner TFCC)

31
Q

what muscle crosses the radiocarpal joint but does not contribute to the stability of the midcarpal joint?

A

FCU: attaches to the pisiform, hook of hamate, base of 5th metacarpal

32
Q

most ligaments and muscles crossing radiocarpal joint also contribute to the stability of the midcarpal joint (true or false)

A

true except FCU

33
Q

The excursions of the midcarpal joint generally favor range of ____ over ____ (extension vs flexion) and ____ deviation over ____ deviation (radial vs ulnar)

A

midcarpal: extension over flexion, radial deviation over ulnar deviation, which is opposite of radiocarpal joint

34
Q

What is the midcarpal joint structure?

A

Articulation between scaphoid, lunate, triquetrum proximally and trapezium, trapezoid, capitate, hamate distally

35
Q

Is the midcarpal joint concave-convex or convex-concave?

A

CONCAVE-CONVEX

36
Q

true or false: the midcarpals move almost as a fixed unit, with equal distribution of loads across articulations with proximal row

A

true

37
Q

Are the dorsal or volar ligaments thicker in the wrist?

A

volar ligaments: thicker and stronger
dorsal ligaments: thinner

38
Q

extrinsic ligaments connect the _____ to the radius or ulna proximally or to the metacarpals distally

A

extrinsic ligaments: carpals to the radius/ulna or to the metacarpals

39
Q

intrinsic wrist ligaments connect the ____ to themselves

A

carpals
intrinsic ligaments are also known as intercarpal or interosseous ligaments

40
Q

true or false: intrinsic ligaments are stronger and less likely to fail but have a slower healing time than extrinsic ligaments

A

true (book, 276)

41
Q

what are the 3 bands of the volar radiocarpal ligament?

A

-radioscaphocapitate/radiocapitate
-radiolunate/radiolunotriquetral
-radioscapholunate

42
Q

what does capitate, the keystone of the wrist carpal bones, touch?

A

2, 3, 4 metacarpals, lunate, trapezoid, scaphoid, hamate

43
Q

What 3 structures are part of the ulnocarpal ligament complex?

A

TFCC, ulnolunate ligament, unar collateral ligament

44
Q

what are the extrinsic volar carpal ligaments?

A

volar radiocarpal ligaments, radial collateral ligament, ulnocarpal ligament compelx

45
Q

what are the intrinsic volar carpal ligaments and what do they do?

A

scapholunate interosseous ligament-maintain scapho-lunate stability
lunotriquetral interosseous ligament-maintain lunate-triquetral stability
v-deltoid

46
Q

what are the dorsal carpal ligaments?

A

dorsal radiocarpal ligament (to triquetrum)
dorsal intercarpal ligament-horizontal from triquetrum, lunate, scaphoid and trapezium

47
Q

what do the dorsal carpal ligaments do?

A

form horizontal V to stabilize scaphoid during wrist ROM
become tight in wrist flexion

48
Q
A

Movement Science 1 (2 decks)

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