Don't know if you guys have heard, there is a newish procedure for chronic sore elbow and sore patellar tendon.
If your elbow hurts at rest, odds are the tendon is slightly torn. They used to operate, screw the tendon back on, 6 weeks in cast.
Now they suck your own blood out, and then inject it back into the tendon where it attaches to the bone. Not a pleasant experience, since they have to poke the tendon and bone a bunch of times, but a lot better then operations. Three injections, separated by a week.
Fixed my elbow 4 years ago, and I just finished getting the third round in my knee.