I had minor joint problems, my left joint pops out more as I open my mouth, this is because one of the condyles is longer than the other in my case. One surgeon wanted to do a artheroplasty on the tmj joint, partly to fix it and partly to handle the condyle length problem while he fixes the tmj joint.
I really don't want to mess with the joint, though, because it really doesn't give me any discomfort now as it is. So we talked about doing a condularectomy instead of a artheroplasty.