Talocrulal joint ligaments Flashcards
What type of joint is talocrural?
hinge
Is dorsiflexion or plantarflexion more stable. Why?
Dorsiflexion because anterior (wider) part of talus moves into pincer. In plantar flexion, the narrow posterior part of talus is in pincer
What are two main ligamentous systems of the ankle joint?
Lateral and medial collateral (deltoid) ligament
Tibio-fibular ligaments (anterior and posterior)
How many and name the lateral collateral ligaments of the ankle
3
ATFL: anterior talofibular ligament
CFL: calcaneoFibular ligament
PTFL: posterior talofibular ligament
Which collateral ligament is the weakest?
ATFL: anterior talofiblular ligament
Which collateral ligament is most often sprained?
ATFL: anterior talofibular ligament
Which ligament is primary restraint against plantar flexion and inversion of foot?
ATFL: anterior talofibiular ligament
Which tendon forms the floor of the peroneal tendon sheath and crosses both talo crural and subtaler joints/s
CFL: calcaneo fibular ligament
When is the CFL relaxed?
when in plantar flexion
When is CFL taut?
In dorsiflexion
What movement does it prevent
stabilizes ankle laterally to prevent inversion
Which is the strongest ligament?
PTFL: posterior talofibular ligament
Does the PTFL ever get sprained or the source of chronic instability?
No
Where does PTFL attach?
From the fibula it attaches onto nonarticulating portion of the posterior talus.
Name the four medial collateral ligaments
Posterior tibiotalar ligament
Tibiocalcaneal ligament
Anterior tibiotalar ligament
Tibionavicular ligament
How many fibrous sheets does the medial collateral ligaments break up into/
Two: deep and superficial
Name the deep medial collateral ligaments
Anterior tibiotalar ligament
posterior tibiotalar ligament
Name the superficial medial collateral ligaments
Tibionavicular ligament
Tibiocalcaneal ligament
Are the deltoid ligaments strong/
Yes. in eversion injuries, the medial malleolus is typically fractured rather than the ligament rupturing
Where do the supericial parts of the deltoid ligaments run?
from medial malleolus to the talus, calcaneus and navicular
What are the distal tibiofibualar ligaments
Anterior tibiofibular joint
Posterior tibiofibular joint
How is the dital tibiofibular joint formed/
by a convex surface of the medial side of the distal end of the fibula and a concave surface of the lateral side of the tibia
What happens to the tibiofibular liagaments in dorsiflexion?
The posterior is taut and anterior is slack; reverse in plantar flexion
Which tibiofibular ligament is injured more/
anterior tfl because there is more instability in plantar flexion
