When the posterior tibial tendon is ruptured, what position does the foot typically assume?

When the posterior tibial tendon is ruptured, the foot typically assumes a position of pronation in the rearfoot. This occurs because the posterior tibial tendon plays a crucial role in maintaining the arch of the foot and providing stability during walking. It helps to invert the foot and assist with the ability to push off during the gait cycle.

When this tendon is damaged, the balance of forces around the foot is disrupted. Without the support of the posterior tibial tendon, the foot tends to roll inward, leading to excessive pronation. This compensatory movement results in the rearfoot adopting a pronated position, which can contribute to altered biomechanics and potentially lead to further complications or discomfort in the lower limb.

Other positions, such as supination of the forefoot or specific flexion movements at the ankle, do not directly relate to the impact of a ruptured posterior tibial tendon on foot posture. Understanding the role of this tendon helps clarify why the foot's position shifts toward pronation when it is compromised.