Wrist joint

Question 1

describe the 3 radioulnar joints

Answer 1

proximal-annular-pivot type
middle-interosseous membrane
distal-round head of ulna, notch of radius, radioulnar ligament

Question 2

what movements are allowed at the radioulnar joints

Answer 2

pronation/supination

Question 3

What bones are involved in the radiocarpal (Wrist) joint?

Answer 3

radius articulates with scaphoid, lunate, triquetrum

Question 4

What ligaments provide stability to the wrist joint

Answer 4

ulnar collateral ligaments-ulnar styloid to triquetrum

radial collateral ligament-radial styloid to scaphoid

Question 5

What provides stability at the MCP, PIP and DIP

Answer 5

Transverse metacarpal ligament
metacarpophalangeal collateral ligaments
phalangeal collateral ligaments

Question 6

what movements can the wrist do

Answer 6

flexion extension
abd add
rotation (all 4)

Question 7

What ligament creates the carpal tunnel?

Answer 7

transverse carpal ligament

Question 8

What is contained in the carpal tunnel?

Answer 8

median n. and 9 tendons
flexor digitorum superficialis t.
flexor digitorum profundus t.
flexor pollicis longus t.

Question 9

What ligament creates the ulnar tunnel? contents?

Answer 9

palmar carpal ligament

ulnar n. and a.

Question 10

what causes carpal tunnel syndrome? sx?

Answer 10

compression of median n due to overuse
neuropathy, muscle atropha in thenar
heal with rest or surgery

Question 11

which carpal bone is most commonly fractured? why?

Answer 11

scaphoid, largest interface with radius

Question 12

Why doesnt the ulna fracture often?

Answer 12

all the weight is put on the radius cause the ulna has no articulation with the wrist

Question 13

describe a colles fracture. how would this person fall? where would their fracture displace the distal radius? xray appearance?

Answer 13

FOOSH, hyperextended wrist
moves distal radius posteriorly/dorsally (wrist is gonna move in direction hand is bending)
“dinner fork”

Question 14

describe a smiths fracture. how would this person fall? where would their fracture displace the distal radius? xray appearance?

Answer 14

FOOSH, hyperflexed wrist
moves distal radius anteriorly/ventrally
“shovel deformity”

Question 15

what is a swan neck deformity?

Answer 15

extension of PIP, flexion of DIP

caused by rheumatoid arthritis/untreated mallet finger

Question 16

your patient has an extended PIP and flexed DIP. what is this

Answer 16

swan neck deformity

Question 17

your patient has an anteriorly displaced distal radius fracture that looks like a dinner fork after a FOOSH, what is this called?

Answer 17

colles fracture

Question 18

your patient has an posteriorly displaced distal radius fracture that looks likes shovel after a FOOSH, what is this called?

Answer 18

smiths fracture

Question 19

what is a boutonnier deformity? cause?

Answer 19

PIP flex
DIP hyper extend
cause: rupture of central slip of extensor tendon at PIP

Question 20

what is mallet finger?cause?

Answer 20

DIP flexed, extensor tendon damage

cause: blunt force trauma

Question 21

what causes skiers thumb?

Answer 21

trauma to the thumb usually from skiers cause their poles

rupture of collateral ligament of MCP joint of thumb

Question 22

skiier comes in and hes like oh shit my thumb is hurt this sucks! Since you payed attention in class you know which structure is most likely damaged, what is it?

Answer 22

collateral ligament of MCP joint of thumb

Question 23

Kid comes in and hes like man i love potentially dying every time i ride a bull cause thats a totally sensible hobby, but boy does it make my wrist hurt and prevents me from jacking off to my favorite pornography, since anatomy is such a thrilling subject and cant get enough of it, which structure is likely causing the pain and what is this condition called?

Answer 23

radial collateral ligament
bull riders thumb
possible avulsion fracture

Question 24

Ouch! your friend just punched you in the face cause you stole his pog collection! but jokes on him, he stands there screaming in pain because his hand hurts so bad as you run off smiling despite being hit in the face because of your newly obtained collection of pogs. What damage did your friend do to their hand? what is this called?

Answer 24

likely fracture of the 5th metacarpal because it leads when you punch,
this is known as a boxers fracture