Elsewhere on this site, people have mentioned dousing knees with cold water in the shower. Based on a few things I found a right royal care programme that dealt with knee/hip pain straight away:
1. Into shower and first off douse knees with coldest water possible
2. Normal shower with normal temperature for whole body
3. A second numbing knee dousing with coldest water possible
4. After drying off rub SBC Arnica Gel into knees and/or hips
5. No pain for the whole of the day or day afterwards
Hope this helps