Forlorn is correct about the importance of a second opinion. I did that before my first partial, and ended up going with the first surgeon (with whom I had previous experience). After the success of the right knee, having him do the left was a no brainer. I would recommend him for a second...
I had 2 partial knee replacements done 2 years ago. I have had no problems (after rehab) and I am able to do everything I used to do before the knee problems developed. There are restrictions: running and jumping are not advisable, since the implant can be dislodged and require a total. But...