Footwear is often the cause of foot injury and therefore a crucial piece of the injury puzzle. People seem to place a heavy reliance on footwear to solve running issues and injuries and although they can be effective, in my opinion nothing substitutes for good core and pelvic control, technique and sensible training.
The key factor with footwear is it must be a good fit. A shoe may suit your foot mechanics on paper however if you put a shoe on and your are bulging out of it, its tight in areas or just ‘doesn’t feel right’ then make sure you move on. First and foremost a shoe should feel like it was made for your foot.
Biomechanical influences may be torsional stability, density/firmness (or ‘cushioning’) the heel counter and upper, the rocker, shank, and even the rubber grip.
It is also important to remember that footwear functions differently on trail, sand grass and pavement.