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Biomechanics > Wrist/hand BM > Flashcards

Wrist/hand BM Flashcards

1
Q

Distal radio-ulnar joint

A

Convex head of ulna on concave radius

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2
Q

Osteokinematics of DRUJ

A

Pronation/supination

Distal radius over distal ulna

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3
Q

Pronation/supination of forearm

A

Simultaneous motion at three joints:

  • humero-ulnar
  • distal radio-ulnar
  • proximal radio-ulnar
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4
Q

Pronation/supination arthrokinematics

A
  • HRJ:radial fovea spins on capitulum
  • PRUJ: radial head spins within ulnar notch
  • DRUJ: radius rolls and glides in same direction on ulna
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5
Q

Wrist complex

A
  • distal radio-ulnar joint
  • radiocarpal j
  • midcarpal j
  • Intercarpal j
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6
Q

Radiocarpal Joint

A

Concave radius and ulna/TFCC

Convex proximal carpals (scaphoid, lunate, traquetrum

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7
Q

Where is the axial loading concentrated on the carpals

A

Scaphoid and lunate

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8
Q

Midcarpal joint

A

Joint separating proximal and distal rows

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9
Q

ROM for midcarpal joint

A

Extension > flexion

UD > RD

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10
Q

Extrinsic ligaments: palmar

A

Palmar ulnocarpal

Palmar radiocarpal

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11
Q

Palmar ulnocarpal

A

part of TFCC

Tightens with extension and ulnar deviation

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12
Q

Palmar radiocarpal

A

Tighten with extension

Stronger and thicker than dorsal radiocarpal ligaments

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13
Q

Extrinsic ligaments: dorsal

A

Radial collateral

Ulnar collateral dorsal radiocarpal

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14
Q

Radial collateral

A
  • Styloid process to scaphoid and trapezium
  • Thicker on palmar side
  • Taut in ulnar deviation and extension
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15
Q

Ulnar collateral

A
  • styloid process if the ulna

- tightens with radial deviation

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16
Q

Dorsal radiocarpal

A
  • radius to scaphoid, lunate & triquetrum

- taut In flexion

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17
Q

Intrinsic ligaments: palmar

A

Palmar intercarpal

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18
Q

Palmar intercarpal

A
  • Capitate to scaphoid and triquetrum

- help guide arthrokinematics

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19
Q

Intrinsic ligaments: dorsal

A

Dorsal intercarpal

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20
Q

Dorsal intercarpal

A

Transverse stability

21
Q

TFCC

A

Triangular Fibrocartilagr complex

22
Q

TFCC components

A

Capsular ligaments of distal radio-ulnar joint; & ulnar collateral lig

23
Q

Radiocarpal osteokinematics

A

Flex/ext

Radial/ ulnar deviation

24
Q

Radiocarpal arthrokinematics (not well understand)

A

Double joint system

Synchronous convex on concave at both radiocarpal and midcarpal

Look at pic

25
Q

Primary wrist extensors

A

ECRL, ECRB, ECU

26
Q

Secondary wrist extensors

A

ED, EI, EDM, EPL, EPB, APL

27
Q

Wrist extensor function

A

Position wrist for finger flexion and gripping activities

28
Q

Primary wrist flexors

A

FCR, FCU, PL

29
Q

Secondary wrist flexor

A

Finger flexors (FDS, FDP) and FPL

30
Q

Carpometacarpal joints 2-5

CMC

A

2&3: stability
4&5: mobility
2,3,4: one DOF
5: two DOF

31
Q

Metacarpophalangeal joints 2-5

MCP

A

Convex metacarpal head

Concave base of proximal phalanx

32
Q

Function of volar plates

A

Resists hyperextension
Protect joint
Increase joint congruence

33
Q

MCP ligaments

A

Collateral: core & accessory

Deep transverse metacarpal lig

34
Q

2-5 MCP DF

A

Flex/ext

Abd/add

35
Q

MCP arthrokinematics

A
  • Roll and glide in same direction

* *Concave prox. Phalanx on convex metacarpal

36
Q

Intrinsic muscles

A

Interossei & lumbricales

37
Q

Palmar interossei

A

Adduct 1,2,4,5

PAD

38
Q

Dorsal interossei

A

Abduct 2, 3, 4

DAB

39
Q

Lumbricales

A

Flex MCP

40
Q

IP joints: fingers

A

Convex proximally

Concave distally

41
Q

IP joints DF

A

Flex/ext

42
Q

Extensor mechanism function

A

Isolated EDC contraction will only extend MCP joint

Interossei & lumbricals must extend PIP & DIP

43
Q

1st CMC

A

1st metacarpal & trapezium

Saddle joint

44
Q

1st CMC joint DF

A

Flex/ext

Ab/AD

45
Q

First CMC arthrokinematics flexion/ext

A

Glide and roll same direction

46
Q

Arches of hand function

A

Gripping objects

47
Q

Arches

A

Proximal transverse: distal row of carpals

Distal transverse: through MCP joints

48
Q

5 types of grips

A 
Power grips
Precision grip 
Power pinch 
Pretension pinch 
Hook grip

Biomechanics (5 decks)

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