What is the function of the deltoid ligament in the ankle?

The deltoid ligament, also known as the medial ligament of the ankle, plays a critical role in providing stability to the ankle joint. Its primary function is to support the medial aspect of the ankle and resist eversion, which is the movement where the sole of the foot turns outward. This ligament is a complex structure comprised of several individual ligaments that collectively attach from the tibia to the bones of the foot.

When the foot undergoes activities that may lead to excessive eversion (such as landing from a jump or walking on uneven surfaces), the deltoid ligament protects against potential injuries by maintaining the integrity of the ankle joint and preventing excessive movement that could lead to sprains or tears. Additionally, the presence of the deltoid ligament helps to stabilize the ankle during various weight-bearing activities, ensuring proper alignment and function.

In contrast, other supports and ligaments in the ankle, such as the lateral ligaments, provide stability against inversion, while the arch support is managed through structures like the plantar fascia and other intrinsic foot muscles. Therefore, the deltoid ligament's specific role in resisting eversion distinctly highlights its essential function in ankle stability.