Eversion Anatomy

Describe Eversion under following heads

1. Eversion Bones taking part,

2. Eversion Axis,

3. Eversion Combination of action,

4. Eversion Range of movements,

5. Eversion Muscles bringing movement,

6. Eversion Functions, and

7. Eversion Applied anatomy.

Eversion Introduction: It is a movement in which the lateral border of the foot is elevated so that sole or plantar surface of the foot faces laterally when the foot is off the ground. Eversion is a combination of pronation and abduction.

1. Eversion Bones taking part: Calcaneum, talus and cuboid.

 

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2. Eversion Axis: An oblique axis runs forwards, upwards and medially. It passes from the back of lateral tubercle of calcaneus. It passes through sinus tarsi to emerge at the superomedial aspect of neck of talus. This axis corresponds to abduction, adduction, plantar flexion and dorsiflexion and medial and lateral rotations of calcaneus.

3. Eversion Combination of action: Abduction, dorsiflexion, rotation and gliding.

4. Eversion Range of movements: It is less free as compared to inversion.

5. Eversion Muscles bringing movements

1. Peroneus longus,

2. Peroneus brevis, and

3. Peroneus tertius.

Peroneus longus and brevis whose tendons pass behind lateral malleolus are plantar flexors. The peroneus tertius is dorsiflexors of ankle joint. These opposite effects cancel each other and produce simple eversion movement. Eversion is a movement of pronation and is accompanied by abduction of the fore part of the foot.

6. Eversion Functions

1. To walk on slippery and uneven surfaces.
2. To maintain an efficient shift of weight distribution among the head of metatarsal bones during locomotion.

7. Eversion Applied anatomy

1. Talipes calcaneovarus: A deformity of the foot in which the heel is turned toward the midline of the body and the anterior part is elevated.
2. Talipes calcaneovalgus: A deformity of the foot in which the heel is turned outward from the midline of the body and the anterior part of the foot is elevated.
3. Talipes equinovalgus: A deformity of the foot in which the heel is elevated and turned outward from the midline of the body.
4. Talipes equinovarus: A deformity of the foot in which the heel is turned inward from the midline of the leg and the foot is plantar flexed. This is typical club foot.
5. Eversion sprains, which are less common, usually involve tearing of the deltoid ligament.

Compare Pronation, Supination with Inversion and Eversion

Spring ligament (plantar calcaneonavicular ligament)

Spring ligament Introduction: It is an anterior segmental tie (staples) and is one of the important ligaments in the maintenance of medial longitudinal arch.

1. Spring ligament Extent: It extends from sustantaculum tali of calcaneus to tuberosity of navicular bone.

2. Spring ligament Functions

1. It supports the head of talus, and
2. It provides attachment to deltoid ligament.

3. Spring ligament Applied anatomy: If this ligament is stretched, the navicular and calcaneum move away from each other and the head of the talus sinks and arch is flattened. It is supported by tibialis posterior, tendons of flexor digitorum brevis, and abductor hallucis