What is the primary function of a Thomas heel in shoe modification?

The primary function of a Thomas heel in shoe modification is to bring the heel into varus. The design of a Thomas heel includes a medial extension that helps control the position of the foot. This is particularly beneficial for patients with conditions that may lead to excessive pronation or flatfoot. By facilitating the alignment of the heel in a varus position, the Thomas heel promotes a more optimal foot alignment, which can enhance stability and improve overall biomechanics during ambulation.

In the context of foot mechanics, bringing the heel into varus helps to distribute weight more effectively across the foot and can mitigate alignment issues that may contribute to discomfort or dysfunction. Therefore, the Thomas heel serves a crucial role in orthotic interventions, particularly in addressing specific alignment and balance needs in individuals with particular foot types or deformities.

Other functions associated with shoe modifications, such as increasing cushioning, correcting forefoot varus, or providing support for flat feet, can play a role in overall foot health, but they do not specifically align with the primary intent of the Thomas heel's design and its impact on heel position.