The More You Know ★
Out of context: Reply #211
- Started
- Last post
- 1,508 Responses
- sofas1
theory on why stones get into shoes from following thread:
https://podiatryarena.com/index.…"Stones 'stick' to the soles of the stance phase shoe. The number of stones sticking is determined by the type and size and shpe of the stones underfoot and the temperature of the stones and the sole of the shoe and the position of the stones relative to the sole ridge pattern.
As the stance phase foot is lifted stones start to fall off. The likelyhood of a stone falling of will be determined by its size and its level of adhesion with the sole of the shoe.
During the swing phase stones continues to fall off the sole of the shoe. As stones fall of their direction of travel is determined by the direction of travel the area of the sole to which they are adhered, the compressional characteristics of the underlying sole and the nature of the adhesion and gravity.
For a stone to have the possibility of getting into the shoe it must be released from the sole of the swing phase shoe when the sole of that shoe is higher than the Upper Rim of the Upper of the Shoe (URUS) of the stance phase shoe. It must also have a direction and sufficient velocity of travel to allow it to collide with or just above the URUS without rebounding. The risk of rebound will affected by hosiery.
The potential gap between URUS and the skin/sock, opens at some point during the stance phase and voila the stone has made its way into the shoe.
The length of the URUS which can potentially receive a stone is remarkably long and while it obviously includes all of the medial URUS of the stance phase shoe it is envisageable that stone could also enter around the lateral aspect of the heel posteriorly and anteriorly to the medial/lateral division of the URUS at least."