wrist

Question 1

What are the joints in the wrist

Answer 1

-radiocarpal: between carpals and radius
-midcarpal joint: between 1st and 2nd row of carpals
-intercarpal joints: between the carpals in the row

Question 2

what does the dorsal tubercle of the radius do

Answer 2

increases the internal moment arm for Extensor pollicis longus

Question 3

ulnar tilt

Answer 3

created by the radial styloid process being more distally

Question 4

palmar tilt

Answer 4

created by the dorsal radius extending out and creating a “roof”

Question 5

Triangular fibrocartilage complex

Answer 5

-takes away from carpal ulnar joint (not there)
-ulnar collateral ligament, articular disc, palmar ulnocarpal ligament

Question 6

Ulnar collateral ligament

Answer 6

prevents radial deviation

Question 7

radial collateral ligament

Answer 7

limits ulnar deviation

Question 8

Dorsal intercarpal ligement

Answer 8

within the carpals and limits flexion

Question 9

short dorsal ligaments

Answer 9

in the distal row of carpals
limits flexion

Question 10

dorsal radoiocarpal ligament

Answer 10

attaches the radius to the carpals
limits flexion

Question 11

short palmar ligament

Answer 11

in the distal row
limits extension

Question 12

transverse carpal ligament

Answer 12

palmar side, in the carpals
limits extension

Question 13

palmar radoiocarpal ligament

Answer 13

radiocapitate, radiolunate, radioscapholunate
limits extension

Question 14

ulnocarpal complex (triangular fibrocartilage complex (TFCC)

Answer 14

ulna collateral ligament
palmar ulnocarpal ligament
articular disc
-takes the ulna out of the wrist joint/does not articulate with carpals
-absorbs about 20% of shock/force and redistributes it

Question 15

osteokinematic motions of the wrist and ROM in degrees

Answer 15

flexion: 0-70/85
extension: 0-60/75
radial deviation: 0-15/20
ulnar deviation: 0-35/40

Question 16

athrokinematics of the radius and proximal row of carpals during extension

Answer 16

dorsal roll and palmar glide

Question 17

athrokinematics of the radius and proximal row of carpals during flexion

Answer 17

palmar roll and dorsal glide

Question 18

athrokinematics of the radius and proximal row of carpals during ulnar deviation

Answer 18

ulnar roll and radial glide

Question 19

athrokinematics of the radius and proximal row of carpals during radial deviation

Answer 19

radial roll and ulnar glide

Question 20

describe ligament tension during RD and UD

Answer 20

there is a lag between the proximal and distal arrow of the carpals
-ulna deviation: outermost on ulnar side is on slack then the middle ligament on ulna side is taut and then medial radial ligament is on slack and then outer radial is taut

-radial deviation: outer most on radial side is on slack then the middle radial ligament is taut and then medial ulnar ligament is on slack and then outer most ulnar ligament is taut

Question 21

voler intercalated segment instability

Answer 21

ligaments between lunate and radius are torn
the lunate will dislocate towards palmar side
(compressive force in wrist extension)

Question 22

dorsal intercalated segment instability

Answer 22

ligaments between the lunate and radius are ton and the lunate will dislocate towards the dorsal side

Question 23

Scaphoid fractue

Answer 23

-scaphoid ligament will most likely be torn and the blood supply will be disrupted and therefore part of the bone will die

Question 24

why are the lunate and scaphoid the most vulnerable

Answer 24

not all the carpal bones are even and the lunate and scaphoid take the force first

Question 25

what is the best wist position for the greatest grip strength

Answer 25

about 30 * of wist extension (mid range)

Question 26

Which have the greatest toque production the flexors or extensors and then the ulnar deviators or radial deviators

Answer 26

flexors
radial

Question 27

Degree of ulnar variance/what are the complications?

Answer 27

-will change the muscle capacity
-will change force production
-when you change the articulations you will change the roll and gilde

Question 28

palmar tilit normal

Answer 28

10* is a normal palmar tilt

Question 29

colles fracture

Answer 29

-distal radius
-often results in “dinner fork deformity”
-displacement of carpal bones towards the posterior