My Mum has suffered with bad knees for a very long time. She seems to almost have a weakness there and finds that if she stumbles or trips, it means that she strains it again and it is very painful for her. I have found this knee wrap which I have suggested that she wears as a support all of the time to try to prevent her injuring herself. She was a bit reluctant to try it but I told her that she should just give it a try for a few weeks and see whether it is any help for her. She has agreed.
I think she likes using the gel pack on them really, but they are great when she has an injury but not a preventative thing. I think it is when she walks in fields where there are lots of rabbit holes or on roads with lots of pot holes she tends to step in the holes and put pressure awkwardly on her knees. I have given her some colpac as well so if the knee wrap is not effective then she can use that to help her injuries if necessary. Hopefully it will work and she will be injury free for a while.