What is skiers thumb? and how do i know if i have it?

Thimb ligament ruptu: Rupture of the ucl ligament of thumb mcp joint from ski pole during a fall see a orthopedic surgeon for exam rthis needs appropriate care to avoid bad outcome formerly know as game keepers thumb although this has subtle differences.

After a fall: When a skier falls on their poles the thumb can get trapped and the injury is in the joint near the base of the thumb. That's why people wear the straps so the pole can break away during a fall.