I read something on the forum today from a sister regarding an ice-type ring for knee replacement pain relief. How can I find out about it?

https://www.agingcare.com/questions/what-type-of-caregiving-is-my-sister-going-to-need-after-a-knee-replacement-480409.htm

Its in a reply

Try a frozen bag of peas. Cheap, easy, probably same results.

Do you remember the title of the posting? You can search for the thread and then private message the person to ask for information. Good luck!