Wrist & Hand Flashcards
Which rays of the hand are most mobile?
thumb, ring, and pinky finger
-this is seen in cupping motions and relaxed fist vs tight fist
How is thumb metacarpal positioned relative to rest of hand?
flexed & pronated position of ~80 degrees to compared to metacarpals of the fingers
What is the role of sesamoid bones?
alleviate or redistribute weight or stress along a tendon or joint surface
What carpal bone is most susceptible to fracture?
scaphoid
-makes up ~ 68% of carpal fractures
What is the common MOI for scaphoid fracture?
FOOSH
-wrist extended and radially deviated
Which carpal bone is most often dislocated?
Lunate
-most dependent on ligamentous support
-weak area of volar ligaments
What is the 2nd most commonly fractured carpal bone?
Triquetrum
~ 18% of carpal fractures
What is the most stable carpal bone?
Trapezoid
-very stable articulations w/ 2nd metacarpal, capitate, and trapezium
Largest carpal bone?
Capitate
“keystone” of the transverse arch of the wrist
Which is the most mobile carpal bone(distal row)?
Trapezium
-forms saddle joint w/ thumb
-at least the most mobilie relative to other distal row carpals
What is the normal slope of radial inclination?
15-20 degrees
-measured from distal articular surface vs line perpendicular to midshaft of radius
-essential tilted toward ulna
What is normal radial tilt?
~15 degrees
-volar or dorsal tilt of radial head
AROM norm forearm pronation
85-90 degrees
AROM norm forearm supination
85-90 degrees
AROM norm wrist flexion
90 degrees
