Lecture: Lower Limb 3: The Ankle Joint and Foot Flashcards Preview

C&M Term 2 > Lecture: Lower Limb 3: The Ankle Joint and Foot > Flashcards

Flashcards in Lecture: Lower Limb 3: The Ankle Joint and Foot Deck (14):
1

Why is dorsiflexion the most stable position of the ankle joint?

Trochlea of talus is wider anteriorly than posteriorly
during dorsiflexion, the anterior part of the trochlea moves between malleoli, spreading tibia/fibula
this increases their grip on the talus

2

what lateral ligaments contribute to the stability of the ankle joint?

Anterior talofibular ligament
calcaneofibular ligament
posterior talofibular ligament

3

what medial ligaments contribute to the stability of the ankle joint?

Deltoid ligament is attached to medial malleolus and fans out to attach to talus, navicular and calcaneus

4

movements possible at the ankle joint?

dorsiflexion
plantarflexion
inversion
eversion

5

Describe the dorsiflexors of the leg

Anterior compartment of the leg
Supplied by deep fibular nerve
supplied by anterior tibial artery

6

Describe the plantarflexors of the leg

Posterior compartment of the leg
supplied by the tibial nerve
supplied by the posterior tibia artery

7

Comment on ankle sprains

Mostly inversion injuries
ligaments relatively avascular so heal slow
predispose to dislocation
if ligament detaches from bone, grows back weaker

8

what is the most common fracture to occur?

breaking off the head of the lateral malleolus
i.e. the head of the fibula as it is much weaker

9

What are the joints involved in the foot?

Transverse tarsal joint, which is made up of:
- talonavicular joint
- calcaneocuboid joint
Naviculo-cuneiform joint
Tarsometatarsal joint
Metatarso-phalangeal joint
Interphalangeal joints

10

What are the arches of the foot and what is their function?

Medial Longitudinal (MLA)
Lateral Longitudinal (LLA)
Transverse (TA)

help distribute weight
increase flexibility of the foot
act as springboards for propulsion during movemet

11

Describe the MLA

comprised of calcaneus, talus, navicular, 3 cuneiforms and 3 medial metatarsals
MLA is higher and more important than LLA

12

Describe the LLA

Calcaneus, cuboid and lateral 2 metatarsals
smaller as on outside of the foot

13

describe the TA

Comprised of cuboid, 3 cuneiforms and bases of the 5 metatarsals

14

what is the difference between passive and active support of the arches of the feet?

Passive - ligaments and the shapes of the bones
Active - intrinsic and extrinsic muscles of the foot