Wrist Flashcards
benefits of a 2 joint system in wrist
large ROM
less tendency for pinch
more capable of withstanding pressure
RC joint
convex on concave
OKC
wrist ligs help with
maintain intercarpal alignmetn
extensor retinaculum
fx to prevent bowstringing
palmar carpal lig
stabilizes wrist FL tendons to prevent bowstringing
carpal tunnel syndrome
9 extrinsic FL muscles plus median nerve can be compresed
wrist closed packed
Full EX with radial deviation
wrist open packed
neutral FL EX with slight ulnar dev
capsular pattern wrist
FL=EX, slight ulnar and radial deviatino
main Fx of wrist EX
act to counterbalance wrist FL during grip/fist
Length tension relationship with grip
max grip with slight EX (30 degrees)
Wrist Fl Fx FCU vs FCR
FCU ahs greatest toque potential
FCU and FCR act synergistically to FL wrist
peak wrist FL
peak rist FL toque in 40 degrees of wrist FL
Radial and ulnar dev coupling
wrist EX typically coupled with radial dev
ulnar dev couple with slight FL
but will remain in slight EX to maintain grip
injury to ulnar collateral lig in wrist
occurs secondary to excessive valgus on thumb MCP
Thumb FL EX arthro
concave on convex
OKC
Thumb AB AD arthro
convex on concave
OKC
opposition coupling
AB FL IR
reposition coupling
AD EX ER
thumb closed packed
full oppositino
thumb open packed
mid FL/EX and mid AB/AD
thumb capsular pattern
AB
2-5 CMC closed packed
full EX
2-5 CMC open packed
mid FL EX
