
In both of the preceding pictures, the hiker could potentially fall and dislocate his thumb.
The second potential problem is what’s referred to as “skier’s thumb.” This particular issue is also related to the strap. If you put your wrist into it and allow the strap to run behind your thumb as shown in the picture above, it is possible that a fall will dislocate your thumb. It is incredibly important to wear a wrist leash — while hiking or skiing — with it running from the top of your wrist.

without the possibility of injury.