What condition can result from a posterior tibial tendon rupture?

A posterior tibial tendon rupture commonly leads to acquired adult flatfoot. The posterior tibial tendon plays a crucial role in supporting the arch of the foot and maintaining normal foot alignment. When this tendon ruptures, its ability to function properly is compromised, leading to a collapse of the medial arch. This results in the foot becoming flatter over time due to the increased load on other structures and the inability to maintain the foot's normal arch.

Acquired adult flatfoot is characterized by a progressive flattening of the arch, often accompanied by pain and instability, particularly during walking or standing. The condition can lead to changes in gait and additional complications in the foot and ankle, such as chronic pain or arthritis, as the body compensates for the altered mechanics.

In contrast, congenital flatfoot is a condition present from birth and not related to tendon ruptures or acquired conditions. Cavus foot involves a high arch and is typically caused by neurological or muscular disorders rather than tendon issues. Equinus foot refers to a deformity where the foot cannot be placed at a right angle due to limited ankle dorsiflexion, which is also unrelated to posterior tibial tendon function. Thus, it is clear that the rupture of the posterior tibial tendon is closely associated with