Ankle and foot muscles Flashcards
Tibilalis anterior O and I
O = lateral tibial condyle, lateral tibia, interosseus membrane
I = dorsal surface of medial cuneiform, base of 1st metatarsal
Concentric actions of the tibialis anterior
Foot dorsiflexion
Foot inversion
Extensor digitorum longus concentric actions
Foot dorsiflexion
Foot eversion
Toe 2nd-5th digit MTP, PIP and DIP extension
Extensor hallucis longus
Foot dorsiflexion
Foot inversion
Toe 1st digit MTP and IP extension
Fibularis longus O and I
o = head of fibula, proximal 2/3 lateral fibula
I = plantar aspect of 1st metatarsal; medial cuneiform
Concentric actions of fibularis longus
Foot plantarflexion
Foot eversion
Fibularis brevis O and I
O = distal 2/3 of the lateral fibula
I = dorsal surface of the base of 5th metatarsal
Concentric actions of the fibularis brevis
Foot plantarflexion
Foot eversion
What is a fibularis strain
The fibularis longus and brevis are commonly strained during an inversion (lateral)
ankle sprain.
* During an inversion ankle sprain, the muscles act eccentrically to prevent excessive
ankle inversion. If the inversion torque acting on the ankle/foot is excessive, the
muscles may become strained along with the ankle sprain
What is an avulsion fracture of the base of the 5th metatarsal
We also already mentioned that during an inversion ankle sprain, the fibularis brevis
pulling on the base of the 5th metatarsal can result in an avulsion fracture of the base of the 5th metatarsal.
Concentric actions of the gastrocnemius
Knee flexion
Foot plantarflexion
O and I of the soleus
O = soleal line; proximal posterior tibia; posterior aspect of head of fibula
I = calcaneus via achilles tendon
Concentric actions of the soleus
Foot plantarflexion
Tibilalis posterior O and I
O = proximal, posterior shafts of tibia and
fibula; Interosseous membrane
I = navicular tuberosity; plantar aspect of
the cuneiforms and cuboid; Bases of 2nd
– 4th metatarsal
Concentric acions of the tibialis posteior
Foot plantarflexion
Foot inversion
