Courtesy: Sports Science Solutions, Arches of the Foot
Overview
The human foot is composed of multiple bones arranged to form structural arches.
These arches are essential for:
- Strength and stability
- Flexibility during movement
- Shock absorption during walking and running
Key Functions of Foot Arches
- Distribute body weight
- Assist in propulsion during gait
- Reduce impact forces on the lower limb
Bones Forming the Arches of the Foot
The arches are formed by a combination of tarsal and metatarsal bones:
Tarsal Bones
- Calcaneus
- Talus
- Navicular
- Cuboid
- Three cuneiform bones:
- Medial
- Intermediate
- Lateral
Metatarsal Bones
- Five metatarsals
Types of Arches of the Foot
There are three main arches:
- Medial longitudinal arch
- Lateral longitudinal arch
- Transverse arch
Medial Longitudinal Arch
Structure
Extends from the heel to the forefoot on the medial side
Bones Involved
- Calcaneus
- Talus
- Navicular
- Three cuneiform bones
- First three metatarsals
Keystone
- Talus
 Represents the highest point of the arch
Characteristics
- Higher and more elastic
- Major role in:
- Shock absorption
- Weight distribution
Lateral Longitudinal Arch
Structure
Runs along the lateral side of the foot
Bones Involved
- Calcaneus
- Cuboid
- Fourth metatarsal
- Fifth metatarsal
Keystone
- Cuboid
Characteristics
- Lower and more rigid
- Provides:
- Stability
- Support during standing and walking
Transverse Arch
Structure
Extends across the midfoot from medial to lateral side
Bones Involved
- Cuboid
- Three cuneiform bones
- Bases of the metatarsals
Function
- Maintains foot curvature across width
- Helps in weight distribution across forefoot
Concept of the Keystone
Definition
The keystone is the central bone at the highest point of an arch, responsible for maintaining its structure and stability.
Examples
- Talus — Medial longitudinal arch
- Cuboid –Lateral longitudinal arch
Functional Importance of Foot Arches
1. Shock Absorption
- Arches act as natural shock absorbers
- Reduce transmission of impact forces
2. Spring Mechanism
- Arches behave like a spring system:
- Flatten under load — store energy
- Recoil — release energy for propulsion
3. Weight Distribution
Body weight is distributed across:
- Heel
- Lateral border of the foot
- Forefoot
4. Stability and Flexibility
- Provide stability during standing
- Allow flexibility during movement
Summary Points
- The foot has three arches:
- Medial longitudinal
- Lateral longitudinal
- Transverse
- Talus — Keystone of medial arch
- Cuboid — Keystone of lateral arch
Clinical Insight
- Foot arches function as:
- Shock absorbers
- Energy-storing springs
- The arrangement of multiple small bones allows:
- Strength
- Flexibility
- Efficient weight transmission
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