MA II: Wrist and hand Flashcards

1
Q

Lister’s tubercle of the radius separates tendons of the

A

EPL/ECRB

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2
Q

carpal bones

A
  • Proximal row: scaphoid, lunate, triquetrum, pisiform
    • Loosely joined
  • Distal row: trapezium, trapezoid, capitate, hamate
    • Distal row bound tightly by ligaments
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3
Q

Axis of rotation for all wrist movement passes thru the

A

capitate

(Capitate and 3rd metacarpal function single column stability)

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4
Q

the first metacarpal articulates with

A

trapezium

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5
Q

Joints of the wrist

A
  1. Radiocarpal joint: concave distal radius and convex scaphoid and lunate (an triquetrum in full ulnar deviation)
  2. Midcarpal joint
  3. Intercarpal joints
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6
Q

arthrokinematics of the radiocarpal and mid-carpal joints during flexion/extension

A
  • lunate and radius roll and slide in opposite direction
  • capitate and lunate roll and slide in opposite directions
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7
Q

arthrokinematics of the radiocarpal joint during ulnar deviation

A
  • Scaphoid, lunate, triquetrum roll ulnarly
  • Slide radially (over the radius)
  • The midcarpal also roll and slide in opposite directions
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8
Q

Primary wrist extensors

A
  • ECRL
  • ECRB
  • ECU

Functional significance of the wrist extensors is to place the long finger flexors (FDP/FDS) in a better length tension relationship to make a fist with strength

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9
Q

primary wrist flexors

A
  • FCR
  • FCU (greatest torque)
  • PL
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10
Q

In the hand, “concave on convex, lets you flex, ____ times”

A

15

except 1st CMC abduction/adduction

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11
Q

what dictates the splinting position in the PIP and DIP joints of the hand?

A

the palmar plates

therefore splint PIP and DIP in extension

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12
Q

what dictates the splinting position in the MCP joints of the hand?

A

collateral ligaments

(splint in flexion)

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