Which directional force acts on the medial calcaneus in the 3-point pressure system for pes varus/supination?

In the context of the 3-point pressure system used for managing conditions like pes varus (supination), the lateral directed force is crucial for creating a balanced and effective orthotic intervention.

When addressing pes varus, the objective is to provide counterforces that help to realign the foot and support the medial aspect, particularly the medial calcaneus. The application of a lateral directed force on the lateral aspect of the foot creates a triad of forces: one acting laterally, one acting on the medial calcaneus to stabilize and support it, and the third being the reaction force that aids in the overall correction of the foot's position.

This force configuration is designed to prevent excessive inversion and control the position of the foot dynamically through activities. Understanding the application of these forces is essential for practitioners in orthotic management, as they work to customize devices that appropriately align and stabilize the foot for patients with pes varus/supination.

The other options, which involve medial, anterior, or posterior directed forces, do not provide the necessary counteraction against the position of the foot that is characteristic of pes varus. These forces in isolation would not yield the same corrective benefits as a lateral force when countering the physiological abnormality.