ankle and foot arthrology - exam 3 Flashcards
What are the 3 lateral collateral ligaments?
-80% of _______
A/P TaloFibular Lig.
CalcaneoFibular Lig.
“sprained” ligaments
Collateral Ligaments:
-motion of injury
inversion of ankle sprains (calcaneus in slight inversion at heel contact & medial malleolus cannot block
Anterior TaloFibular (ATF)
runs______
ant. lat. to neck of talus
What is the most frequently injured lateral collateral ligament?
–motions
ATF
–inversion/adduction (IR) especially with PF (ant. slide of talus)
CalcaneoFibular (CF) runs _____
–resists:
inf. and post. from apex of lat. malleolus to calcaneus
inversion @ TC especially w/ full DF (post . slide of talus)
Which ligament stabilizes Talus in mortise?
PTF
Posterior TaloFibualr (PTF:)
-runs:
-limits:
post. lat. tubercle of talus to lat. malleolus - runs horizontal
limits aBd/er (post slide of Talus)
The TaloCrural Joint: (tibfib/talus)
–one primary ______
Why is the TC jt. axis unique?
one primary degree of freedom
axis: through talus and the tips of malleoli; lateral to inf. and post. to med. —-> not pure ML
Due to the axis of the TC Jt. not being pure ML it causes:
DF with?
PF with?
DF w/slight aBd/eversion
PF w/slight aDd/inversion
**technically due to supination /pronation but ignored clinically due to small contribution
What is the neutral position of the TC Jt.
-the TC jt. permits for more PF or DF?
0º of TC joint = foot at 90º to leg
PF: 40-55º
arthrokinematics: talocrural joint open chain DF
–mortise?
–taut ligs? (3)
- talus rolls forward (relative to leg) and slides posterior
- mortise occupied (wedged) and is closed packed position (tib/fib slide apart slightly)
- CF, PTF, Post.TibioTalar of Delt.
arthrokinematics: talocrural joint closed chain DF
- tibia moves anteriorly
- mortise still in closed packed position
What position would you mobilize the talus to gain DF?
post. directed translation of talus relative to leg
arthrokinematics: talocrural joint open chain PF
- the talus _______ mortise
talus rolls posteriorly and slides anteriorly
(talus not in mortise; decreased ankle stability)
arthrokinematics: talocrural joint closed chain PF
- the talus _______ mortise
CC tibia moves posteriorly
(talus not in mortise; decreased ankle stability)