Ankle joint Flashcards
1
Q
what are the main movements at the ankle and their associated joint?
A
- plantar/ dorsiflextion : ankle joint.
- inversion / eversion : subtalar joint.
2
Q
what are the muscle groups involved in the movements associated with the ankle?
A
- plantarflextion : running parallel to malleoli in posterior and lateral compartments of leg.
- dosiflextion : anterior to malleoli at anterior compartment of leg.
- inversion : medial aspect of foot, posterior compartment of leg.
- eversion : lateral foot, lateral compartment of foot.
3
Q
what are the nerves supplying posterior leg, anterior leg and lateral leg?
A
- anterior : deep fibular.
- posterior : tibial.
- lateral : superficial fibial nerve.
4
Q
what components of the ankle joint contribute t0 its stability?
A
- bone.
- ligaments.
- joint capsule.
- muscle.
5
Q
how does bone contribute to the stability of the ankle joint? specifically focus on the talus.
A
- the talus has a shape with wider anterior articular surface which makes the joint more stable at dorsiflextion.
- plantar flexion allows a wider range of movement but more prone to injury.
6
Q
The ankle is a hinge joint. what does this mean?
A
- movement only occurs in one plane (dorsi/plantarflexion).
- ligaments around ankle keep movement in this single plane and prevents hyper-plantar/dorsifelxion.
(as in hyper-inversion/eversion)
7
Q
what muscle structure adds stabiity and maintains the foot arch?
A
- fibularis longus, tibialis anterior and posterior tendons.
8
Q
what ligament is likely to rupture at forced inversion?
A
- anterior talofibular ligament.
