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.
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?