I sometimes deal with patella subluxation (one kneecap likes to spontaneously dislocate).
Last week my kneecap dislocated as my son was getting off my lap. No fun!
I don't have any real kiatsu training or experience, but I would say I picked up a thing or two related to kiatsu. I noticed that my ability to give massages improved quite a bit from my Aikido training: how to touch "soft" so I can get higher pressures without pain (my sense of it at least); greater intuition for how to apply pressure in general.