Foot & Ankle Anatomy and Biomechanics: Key Structures and Movement Analysis

How many bones are in the foot?

26 bones

What are the three functional regions of the foot?

Hindfoot, Midfoot, Forefoot

Which bones are part of the hindfoot?

Talus and Calcaneus

What is the primary function of the hindfoot?

Initial ground contact, shock absorption, and transferring forces from the leg to the foot

Which bones comprise the midfoot?

Navicular, Cuboid, and three cuneiforms

What is the main function of the midfoot?

Supports the arches, distributes body weight, and adapts to uneven surfaces

What bones are found in the forefoot?

Metatarsals and Phalanges

What is the function of the forefoot?

Push-off during walking/running and final force production during propulsion

What bones form the talocrural joint?

Tibia, Fibula, and Talus

What movements occur at the talocrural joint?

Dorsiflexion and Plantarflexion

Why is dorsiflexion range important?

It is one of the most important clinical measurements.

What bones are involved in the subtalar joint?

Talus and Calcaneus

What movements does the subtalar joint facilitate?

Pronation and Supination

What is the function of the midtarsal joint during loading?

Acts as a mobile adaptor and allows shock absorption

What is the function of the midtarsal joint during propulsion?

Locks into a rigid lever for efficient force transfer

What is the role of the medial longitudinal arch?

Stores elastic energy, returns energy during walking/running, and improves efficiency

What are the two main types of muscle groups in the foot?

Extrinsic and Intrinsic muscles

What is the primary function of extrinsic muscles?

Produce movement, provide strength, and stabilize the foot

Which muscles are examples of extrinsic muscles?

Gastrocnemius, Soleus, Tibialis anterior, Tibialis posterior, Peroneals

What is the primary function of intrinsic muscles?

Maintain arch, improve balance, provide fine control, and dynamic stability

What is the primary muscle responsible for dorsiflexion?

Tibialis anterior

What are the primary muscles involved in plantarflexion?

Gastrocnemius and Soleus

What compensations may occur with limited dorsiflexion?

Early heel rise, excessive trunk lean, foot abduction, increased pronation

What is the sequence of normal pronation during movement?

Ground contact → Pronation → Shock absorption → Supination → Rigid lever → Push-off

What is the consequence of excessive pronation?

Increased tibial internal rotation, knee valgus, delayed propulsion, and overuse injuries

What is the clinical significance of the tibialis posterior muscle?

Controls pronation eccentrically and supports the medial arch

What is the importance of peroneals (Fibularis muscles)?

They resist inversion and provide lateral ankle stability

What is the relationship between foot mechanics and the kinetic chain?

Foot dysfunction can affect the knee and hip, leading to pain and dysfunction.

What is the role of intrinsic muscles during the loading phase?

Control arch deformation

What is the role of extrinsic muscles during the propulsion phase?

Generate force