A medial ankle sprain involves which structure typically?

A medial ankle sprain involves which structure typically?

• A. The deltoid ligament complex, usually from eversion.
• B. ATFL.
• C. Interosseous membrane.
• D. Syndesmotic ligaments.

Answer: (A)

Medial ankle sprains are driven by an eversion (valgus) force that pushes the foot inward, stressing the structures on the inner side of the ankle. The deltoid ligament complex is the main stabilizer on that medial side, a broad group of ligaments that resist eversion and help hold the tibia and talus together. When the force occurs, this ligament complex is the most likely structure to be injured, sometimes with an accompanying avulsion fracture of the medial malleolus because of how the ligament attaches. In contrast, injuries to the ATFL are most common with inversion sprains, not medial sprains. The interosseous membrane and distal tibiofibular (syndesmotic) ligaments are involved in high ankle sprains, which result from different mechanisms (often external rotation or dorsiflexion) and are not the typical medial injuries.

Medial ankle sprains are driven by an eversion (valgus) force that pushes the foot inward, stressing the structures on the inner side of the ankle. The deltoid ligament complex is the main stabilizer on that medial side, a broad group of ligaments that resist eversion and help hold the tibia and talus together. When the force occurs, this ligament complex is the most likely structure to be injured, sometimes with an accompanying avulsion fracture of the medial malleolus because of how the ligament attaches.

In contrast, injuries to the ATFL are most common with inversion sprains, not medial sprains. The interosseous membrane and distal tibiofibular (syndesmotic) ligaments are involved in high ankle sprains, which result from different mechanisms (often external rotation or dorsiflexion) and are not the typical medial injuries.