Question

multiple choice question

what is the function of the collateral ligament of the ankle?

to bind the tibia to the foot on the medial side
to bind the fibula to the foot on the lateral side
to bind the tibia to the fibula on the medial side
to bind the tibia to the foot on the lateral side

Explanation:

Identify the target structure

The question asks for the function of the "collateral ligament of the ankle" (specifically referring to the medial collateral ligament, also known as the deltoid ligament).

Analyze the anatomical connections

Using the Ankle Joint Anatomy and Medial Ankle Joint knowledge points

• The medial collateral (deltoid) ligament is a strong, triangular band attached superiorly to the medial malleolus of the tibia.
• It radiates downward to attach to the talus, calcaneus, and navicular bones of the foot.
• Therefore, its primary anatomical connection is to bind the tibia to the foot on the medial side.

Evaluate the given options

Using the Ankle Joint Biomechanics knowledge point

• Option 1: "To bind the tibia to the foot on the medial side" correctly describes the medial collateral (deltoid) ligament.
• Option 2: "To bind the fibula to the foot on the lateral side" describes the lateral collateral ligaments (such as the anterior talofibular, posterior talofibular, and calcaneofibular ligaments).
• Option 3: "To bind the tibia to the fibula on the medial side" is anatomically incorrect because the fibula is on the lateral side.
• Option 4: "To bind the tibia to the foot on the lateral side" is anatomically incorrect because the tibia is on the medial side.

Answer:

• (A) To bind the tibia to the foot on the medial side (Correct answer)
• (B) To bind the fibula to the foot on the lateral side
• (C) To bind the tibia to the fibula on the medial side
• (D) To bind the tibia to the foot on the lateral side