Ankle joint Flashcards Preview

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Flashcards in Ankle joint Deck (21):
1

What type of synovial joint is the ankle

Hinge (one plane)

2

What movements does the ankle joint permit

Dorsiflexion and plantarflexion

3

What are the articulating surfaces at the ankle joint

Tibia and fibula produce a bracket shaped socket called a mortise
Body of talus fits into the mortise

4

Significance of articulating talus shape in terms of movement

Body of talus is wider anteriorly so during dorsiflexion, the talus gets wedged between the malleoli
This means dorsiflexion is more limited and more stable than plantarflexion

5

What are the groups of ankle ligaments

Collateral ligaments
Medial ligament (deltoid)
Lateral ligament

6

What are the collateral ligaments

Medial - from tibia to talus, from tibia to calcaneus
Lateral - from fibula to talus, room fibula to calcaneus

7

What is the medial ligament made up of

Anterior tibiotalar
Posterior tibiotalar
Tibial navicular
Tibial calcaneal

8

Where does the medial ligament originate

Medial malleolus

9

Where does the lateral ligament originate

Lateral malleolus

10

What is the lateral ligament made up of

Anterior talofibular
Posterior talofibular
Calcaneofibular

11

Where do plantar flexors pass at the ankle

Posterior to malleoli

12

Where do dorsiflexors pass at the ankle

Anterior to malleoli

13

Where do inverters insert

Medial aspect of foot

14

Where do everters insert

Lateral aspect of foot

15

Where is the joint capsule lax

Anterior and posterior

16

Neurovascular supply of ankle joint

Arterial - Malleolar branches of anterior tibial, posterior tibial and fibular arteries
Innervation - tibial and deep fibular nerves

17

What is an ankle sprain

Partial or complete tear in ankle ligaments

18

How do ankle sprains usually occur

Excessive inversion in a plantar flexed foot

19

Which ligament is most likely to get damaged in an ankle sprain

Anterior talofibular ligament
Lateral ligament is weaker than medial
Lateral ligament resists inversion

20

What's a Potts fracture

Bimalleolar (medial and lateral malleoli) or trimalleolar (medial and lateral malleoli, and distal tibia) fracture

21

How do Potts fractures occur

Forced eversion pulls on medial ligament causing an avulsion fracture of medial malleolus
Talus moves laterally, breaking off the lateral malleolus
Tibia forced anteriorly, shearing off the distal part against the talus

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