Wrist and Hand Complex Flashcards

1
Q

How many DOF does the wrist have ?

A

2 DOF

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2
Q

Normal ROM of wrist?

A

80/70 flx/ext
20/30 rad/ulnar dev

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3
Q

wrist end feels

A

flx/ext- capsular
rad dev-hard (radial styloid process)
uln dev- capsular

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4
Q

what is the capsular pattern of the wrist?

A

flexion and extension are equally limited

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5
Q

Most unstable carpal bone?

A

lunate

Ligaments damaged makes it easier for bones to luxate

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6
Q

Shape of the carpal bones

A

scaphoid- like a boat
lunate-moon
triquetem- triangular
pisiform- shaped like a pea
capitate- captain of the carpals(largest)
trapezium-assymetric shape
trapezoid-like a table
hamate-like a hook

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7
Q

Triangular fibrocartilage complex (TFCC)

A

securely bind distal ends of the radius and ulna

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8
Q

Kinematics of wrist flexion and extension

A

convex on concave
flexion : palmary roll dorsal slide
extension: dorsal roll palmar glide

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9
Q

Kinematics of wrist in deviation

A

convex on concave

proximal capral row slides opposite of motion

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10
Q

What is they keystone of the proximal transverse arch?

A

capitate

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11
Q

proximal transverse arch

A

forms tunnel for which the long finger flexors and median nerve to travel

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12
Q

how many DOF in metacarpophalengeal and kinematics

A

2 dof
flx /ext concave phalynx on convex metacarpal
add/abd concave phalanyx on convex metacarpal

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13
Q

IP joint

A

1 DOF- flx /ext

true synovial joint

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14
Q

lumbricals and interossei

A

contraction produces MCP flx and IP/DIP ext

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15
Q

thumb

A

2 DOF
flx/ext abd/add circumduction=opposition
saddle joint

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16
Q

kinematics of the thumb flx/ext

A

flexion: convex metacarpal rolls and slides in ulnar with slight medial rot

extension: concave surface of metacarpal rolls and slides in radial direction with slight lateral rotation

17
Q

kinematics of thumb abd/add

A

abd: convex metacarpal rolls in a plamar direction and slides dorsal

add: convex metacarpal rolls dorsal and slides palmar

18
Q

prehesion

A

grasping or taking hold

ex . grabbing baseball bat

19
Q

power grip

A

full hand prehension

20
Q

precision handling

A

finger thumb prehension

21
Q

cylindrical grip

A

uses finger flexors to postion fingers around and maintain grasp on object

22
Q

spherical grip

A

the greater spread pf fingers to encompass the object

23
Q

hook grip

A

briefcase grip

never includes thumb

24
Q

lateral prehension

A

contact between two adjacent fingers

25
pad to pad prehension
distal phalynx or pad of thumb to another finger
26
tip to tip prehension
nearly identical to pad to pad
27
pad to side
key grip
28
functional position of the hand
20 deg ext 10 deg ulndar deviate slight dlexion at PIP and DIP
29
boutonniere deformity
failure of the extensor hood mechanism extension of pip
30
swan neck deformity
damage to attathcment of extensor tendon
31
trigger finger
caused by edema and subsequent narrowing of A1 pulley on typically third or fourth finger 4x more likely in diabetics
32
what is the sesamoid bone of the wrist?
pisiform
33
MCP kinematics
MCP flexion palmar roll palmar glide MCP extension dorsal roll dorsal glide
34
What planes of motion are done in the thumb?
ext/flx done parallel to hand add/ abd perp to hand
35
what is convex and what is concave?
carpals are convex , radius is concave