I've always worn pedals with cages, but am thinking about getting clipless pedals soon. I have really "open" knees with a lot of knee instability. Basically my kneecaps can dislocate on their own while my knee is in motion. Usually they move back into place properly and there are no issues, but sometimes they don't. This has never happened to me while cycling (it's only happened in high impact activities such as running and jumping), but it's very painful and I'd like to avoid it if at all possible.

I've read (here on TE) that float is good for the knees, and that Speedplay Frogs are great for the knees because they have so much float. However, I'm wondering if there is such a thing as too much float. Because my knees are inherently unstable, would it be better for me to get a pedal with less float and more stability, like a Crank Bros candy? Or would that exacerbate my knee issues?

Thanks in advance.