1. Myology
Myology of the
Ankle

2. Anatomical Review: Tibia and Fibula

3. Tarsals, Metatarsals, and Phalanges
Consists of seven small bones called tarsals
Tarsals form the posterior half of the foot and heel.
Bones: Talus, calcaneus, cuboid, navicular, and three cuneiforms
Metatarsals
Same as the palm there are five metatarsals numbered I through V, with number I being the great toe
Each metatarsal has a base, shaft, and a head
The base articulates with the tarsals while the head articulates with the phalanges.

4. Toes:
14 phalanges in each foot
Each phalanx also consists of a base, shaft, and head
The great toe only contains two phalanges, a proximal and distal one
The remaining toes each contain three phalanges (proximal, middle, and distal)
Joints formed between phalanges:
Proximal interphalangeal joint (PIP)
Joint formed between proximal and middle phalanges
Distal interphalangeal joint (DIP)
Joint formed between middle and distal phalanges

5. Anatomical Review: Foot

6. (See plate 5 for diagram of the arches of the foot)
Functions:
1. Support the weight of the body
2. Provide an ideal distribution of the weight of the body over the
hard and soft tissue of the foot.
3. Provide leverage while walking.
Arches are not rigid, they yield as weight is applied and spring back when weight is lifted thus helping absorb shock.
Arches develop about the age of 13
3 Arches:
1. Medial longitudinal arch: Originates at the calcaneus, rises to the talus, and
descends through the navicular, the three cuneiforms, and the heads of the three
medial metatarsals.
2. Lateral longitudinal arch: Originates at the calcaneus, rises to the cuboid, and
descends to the heads of the lateral two metatarsals.
3. Transverse arch: Formed by the navicular, three cuneiforms, and bases of the five
metatarsals.

7. Anatomical Review: Arches of the Foot

8. Articular Anatomy: Ankle
Ankle Joint: Also known as the talocrural joint
Formed by the articulation of:
1. Medial malleolus of the distal tibia and talus
2. Lateral malleolus of the distal fibula and talus
Considered to be a hinge joint
Intertarsal joints: (3 articulations)
1. Subtalar joint: articulation between talus and calcaneus
2. Talocalcaneonavicular joint: articulation between talus,
calcaneus, and navicular.
3. Calcaneocuboid joint: articulation between calcaneus and
cuboid
These are considered to be planar (gliding) joints as the articular surfaces are flat or slightly curved.

9. Soft Tissue of the Ankle and Foot
Articular Capsule: composed of fibrocartilage, thin anteriorly and posteriorly. Extends from the malleoli to the talus.
Deltoid Ligament: Triangular shaped ligament on the medial aspect of the ankle. Apex is located at the medial malleolus. Base attaches to the talus, navicular, and calcaneus. Clinically, a very strong ligament. With eversion injuries the bones of the leg/ankle will most likely fracture before this ligament will tear.
Plantar Calcaneonavicular (Spring) Ligament: Extends from the medial aspect of the calcaneus to the navicular.

10. Soft Tissue of the Ankle and Foot
Lateral Ligaments: (considered some of the weakest ligaments in the body)
a. Anterior Talofibular Ligament: Extends from the lateral
malleolus to the talus
b. Posterior Talofibular Ligament: Extends from the
lateral malleolus to the talus
c. Calcaneofibular Ligament: Extends from the lateral
malleolus to the lateral aspect of the calcaneus.

11. Ankle and Foot Ranges of Motion
Each student should be able to describe and demonstrate the following movements:
Ankle Dorsiflexion
Ankle Plantarflexion
Ankle Inversion
Ankle Eversion
Toe Flexion
Toe Extension
Toe Abduction
Toe Adduction
Hallux Flexion, Extension, Abduction, and Adduction
Ankle joint
Intertarsal joint
Same as the fingers

12. Palpation of the Ankle and Foot
Lateral and Medial Malleoli: Seated, palpate the large knobs on either side of the ankle.
Note that the broader, medial malleolus is located at the distal end of the tibia while the more
slender lateral malleolus is part of the fibula.
Calcaneus: Seated, again locate the malleoli. Slide your fingers toward the heal and palpate
the shape of the calcaneus.
Cuneiforms: Seated, find the base of the 1st metatarsal. Then slide proximally into the “ditch”
of the tarsometatarsal joint. Then continue proximally onto the surface of the medial
cuneiform. To find the middle and lateral cuneiform, slide your fingers laterally along the
dorsal surface of the foot.
Navicular: Seated, again locate the base of the 1st metatarsal. Slide along the medial side of
the foot, moving proximally across the surface of the medial cuneiform onto the navicular.
Cuboid: Seated, locate the 5th metatarsal bone. Slide your finger along the 5th metatarsal to
its base (which is expanded laterally). Continuing along the lateral side of the foot, slide your
finger off the base of the 5th metatarsal onto the lateral border of the cuboid.

13. Muscles that move the ankle
Tibialis Anterior
Extensor Digitorum Longus
Extensor Hallucis Longus
Peroneus (Fibularis) Tertius
Peroneus Longus
Peroneus Brevis
Gastrocnemius
Soleus
Plantaris
Popliteus
Flexor digitorum longus
Flexor hallucis longus
Tibialis posterior
Anterior Compartment
Lateral Compartment
Posterior Compartment

14. Tibialis Anterior O: Entire shaft of the tibia
I: 1st Cuneiform/1st Metatarsal
A: Dorsiflexes and inversion of the ankle.
N: Deep peroneal nerve
Clinically, the Tibialis Anterior is related to shin splints, causing anterolateral leg pain

15. Extensor Digitorum Longus
O: Proximal anterior fibula
I: Middle and distal phalanges of the lateral four toes
A: Extension of toes 2 through 5 and assists in dorsiflexion of the ankle.
N: Deep peroneal nerve

16. Extensor Hallucis Longus
O: Distal 1/3 of the anterior surface of the fibula and interosseous membrane
I: Base of the distal phalange of the big toe.
A: Extends the great toe
and assists in dorsiflexion of the
ankle.
N: Deep peroneal nerve

17. Peroneus (Fibularis) Tertius
O: Anterior surface of the distal fibula
I: Base of the 5th
metatarsal
A: Dorsiflexion and
eversion of the foot
N: Deep peroneal nerve

18. Peroneus (Fibularis) Longus
O: Proximal surface of the fibular head and shaft of the fibula
I: Muscle cross under the foot from lateral to medial inserting onto the base of the 1st metatarsal and medial cuneiform.
A: Eversion of the foot and assists in plantarflexion of the ankle.
N: Superficial peroneal nerve

19. Peroneus (Fibularis) Brevis
O: Lower 2/3 of lateral shaft of the fibula
I: Base of the 5th metatarsal
A: Eversion of the foot and assists in plantarflexion of the ankle.
N: Superficial peroneal nerve

20. Gastrocnemius O: Posterior surface of the medial and lateral condyles
I: Posterior surface of the
calcaneus via the Achilles
tendon.
A. Knee: Flexion
Ankle: Plantarflexion
Tibial nerve

21. Soleus O: Soleal line of tibia and fibular head.
I: Calcaneus via the Achilles tendon.
Plantarflexion of the foot
N: Tibial nerve

22. Plantaris O: Lateral epicondyle of the femur
I: Calcaneus via the Achilles
tendon.
A: Plantarflexion of the foot and flexion
of the knee
N: Tibial nerve

23. Popliteus O: Lateral condyle of the femur
I: Posterior proximal shaft of the
tibia
A: Initiates knee flexion by medial
rotation of the tibia to unlock the
knee
N: Tibial nerve

24. Flexor Digitorum Longus
O: Posterior surface of mid-shaft of
the tibia
I: Plantar surface of toes 2-5
A: Flexion of the toes, Plantarflexion and inversion of the ankle
N: Tibial nerve

25. Flexor Hallucis Longus
O: Posterior surface of fibula
I: Plantar surface of the great toe
A: Flexion of the great toe
Plantarflexion and inversion of
the ankle
N: Tibial nerve

26. Tibialis Posterior O: Posterior aspect of proximal tibia and fibula
I: Plantar surface of the foot
(navicular, adjacent tarsals, and
metatarsals)
A: Plantarflexion and inversion of
the ankle
N: Tibial nerve