A Thomas heel supports which anatomical part?

The Thomas heel is specifically designed to provide support to the sustentaculum tali. This anatomical structure is part of the calcaneus (heel bone) and serves as an important support point for the medial longitudinal arch of the foot. The design of the Thomas heel includes a slight extension that helps stabilize the subtalar joint and manages subtalar pronation, contributing positively to the proper alignment of the foot.

While the other options mention different parts of the foot, they do not directly correlate with the primary purpose of the Thomas heel. For example, the cuboid notch is related to different aspects of foot mechanics, while support for the longitudinal arch and the 1st metatarsal are not as directly associated with the specific function the Thomas heel serves in stabilizing and supporting the sustentaculum tali. Understanding the distinct roles and locations of these anatomical features is crucial for proper foot mechanics and the effectiveness of pedorthic devices.