Which structure assists in the formation of the lateral-longitudinal arch?

The cuboid plays a key role in the formation of the lateral-longitudinal arch of the foot. This structure is located on the outer aspect of the foot and serves as a stabilizing element for weight distribution and support.

As part of the lateral arch, the cuboid provides a base for the fourth and fifth metatarsals and acts as a connection point for several ligaments and tendons. Its unique shape helps maintain the arch's integrity during activities such as walking and running, where the foot undergoes significant stress and pressure.

The calcaneus, while important for overall foot structure and biomechanics, primarily contributes to the overall foot arch but is not directly involved in forming the lateral-longitudinal arch. The talus is mainly associated with the ankle joint and does not have a prominent role in supporting the lateral arch. The navicular bone supports the medial arch and is not involved in the lateral arch's formation. Each of these contributions highlights why the cuboid is essential for the lateral-longitudinal arch.