“Another undesirable characteristic of footwear that will have a negative impact on proximal plantar fasciitis symptom resolution is midfoot flexibility.
Losito is currently a team physician/podiatrist for the Miami Heat. James M Losito in "Basketball and Volleyball" chapter, Athletic Footwear and Orthoses in Sports Medicine (Springer, 2010). Failure to maintain shank stability may contribute to a variety of problems including plantar fasciitis.” Some manufactures have reinforced the shank with fiberglass, plastic, or graphite material in an attempt to reduce bulk but maintain stability. The shoe should never have sagittal plane flexibility in the shank region. It is essential that a basketball shoe has solid shank stability. “The combination of outersole and midsole determines the properties of the shank. This is completely unnatural and the fact that one's foot is forced to prevent the shoe from folding as such means that one's foot is forced to support the shoe (instead of the reverse). Now why is this bad? Because no one's foot bends in the middle under their arch. This alternate angle also shows that mid-foot is far more flexible than any other portion of the shoe. You can clearly see from this capture that the Freak 2 is forced to fold at its weakest spot (the mid-foot under the arch) because the forefoot is too stiff! If the forefoot were more flexible than the mid-foot, it would bend there first and not in the middle. Yet the Zoom Freak 2 isn't a flexible shoe they're just very flexible in an area where you don't want much flexing. It's quite common that people confuse a lack of torsional support with improved flexibility. For a decoupled midsole with a soft midsole foam, something like the Why.notZer0 series' sturdy external TPU plate would be much safer. A reason for this is that the Phylon midsole is quite soft and doesn't get any stronger with use thus the small shank plate isn't close to being enough to maintain torsional support over time. Structurally this shoe is still weak in the middle like the ZF1s even though Nike highly publicized that they included a mid-foot shank this time around (in China releases they actually included a sticker with the shoe advertising this fact).
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