Inversion and eversion

1) Definition

2) Muscles &Joints involved

3) Functional Significance

4) Axis of Movement

5) Limiting Factors

a) Inversion – a movement in which the medial border of the foot is elevated, so that the sole faces medially.

b) Eversion – a movement in which the lateral border of the foot is elevated, so that the sole faces laterally

Joints

Main

Accessory

1

Subtalar (Talocalcanean)

Calcaneocuboid

2

Talocalcaneonavicular

Talonavicular

Muscles

Principal

Accessory

Inversion

Tibialis anterior

Flexor hallucis longus

Tibialis posterior

Flexor digitorum longus

Eversion

Peroneus longus

Peroneus tertius

Peroneus brevis

help the foot in adjusting to uneven & slippery ground.

These movements take place around an oblique axis running forwards, upwards and medially, passing from back of calcaneum, through the sinus tarsi, to emerge at the superomedial aspect of neck of talus

 

Muscle

Ligament

Inversion

Tension of peronei

Tension of cervical ligament

Eversion

Tension of tibialis anterior&posterior

Tension of deltoid ligament

*muscles of opposite movement are the limiting factors

Points to be noted:-

These movements can be produced when the foot is off ground.

When the foot is on ground, these movements help to adjust on uneven grounds.

The entire part of foot below talus moves together.

Inversion accompanied by–plantar flexion of foot & adduction of forefoot.

Eversion accompanied by-dorsiflexion of foot & abduction of forefoot.

 

Dharmin Doshi & Soumya Khot

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