High Foot Arches & Peroneus Longus

Working with an athlete that had years of plantar fascitis and a recent tear in their plantar fascia has led to a lot of studying about the biomechanics of the feet.

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Peroneus longus is one of the muscles that stood out in it’s role to support the arch or in this case to cause a high arch. A high arch secondary to a plantar flexed 1st ray leads to a shortened plantar fascia, which would be susceptible to tearing when the foot goes from an open chain high arch position to a closed chain pronated position.

A: Peroneus longus functions as an ankle pronator

B: Peroneus longus can now work properly

C. Peroneus longus functions as a 1st ray plantar flexor.

Jeffery Zimmerman Does a tight/short peroneus longus cause high arches or an overpronated foot? Do you see people with high or low arches with tight/short peroneus longus?

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