Excess calcaneal eversion during contact with a slap foot gait may indicate what type of arch?

Excess calcaneal eversion during contact in a slap foot gait is indicative of pes planus, commonly known as flat feet. In individuals with pes planus, the arch of the foot is lowered, which can lead to excessive pronation or eversion of the heel when the foot strikes the ground. This movement helps to absorb shock, but when it is excessive, it can contribute to instability and lead to further complications, such as pain or discomfort in the feet and lower extremities.

With pes planus, the lack of a pronounced arch results in a foot structure that is less rigid and more flexible. This can lead to the foot rolling inward excessively, which is reflected in the calcaneal eversion observed in a slap foot gait. This is in contrast to pes cavus (high arch), where the arch is overly elevated, resulting in decreased shock absorption and stability, and typically less eversion occurs during the gait cycle.

Understanding the mechanics of these arch types is crucial for foot health and for fitting therapeutic footwear correctly. In the case of pes planus, shoes that offer arch support and stability can help to mitigate the effects of excessive eversion during walking or running.