When I was a kid my knee used to pop out of place and to the other side of my leg, it was so repetitive that finally my knee swelled up so big and bad that all I had to do was try and walk and it would pop. Mom and dad had us kids on wellfare so they took me to the clinic in California in the 70's to have it fixed they said it needed to be drained so they took that big needle, never numbed me, stuck it in under my left knee cap after they strapped me down to the table, I screamed so loud and it (even with the restraints) took three nurses and two doctors to hold me down and then to top it off the needle got stuck and they had to rip it out which tore my meniscus, so I guess it depends on who,when,where and what. But I do believe things are much better now and I hope all went well for you today, you may have already responded to that but I didn't get a chance to read all of these but best of luck to you!!
Kel