I have the same problem.
I had an abscess I & D (inscission and drain) on my upper arm halfway between my elbow and shoulder.
After laying in a hospital bed for a week not moving my arm I lost full extension of my elbow.
It wasn't bad enought to catch the nurses attention or for me to worry about. i figured it would get better over time.
What actually happened was is got much worse with time.
My arm is now bent at an angle permanently and I can not straighten it completely.
I should have gone in immediately and had it looked at but I didn't.
I was laid off and lost my health insurance shortly after.
Now I need to try physical therapy to see if it will help.
I hope it does because with no insurance a surgery (if possible) would be difficult to finance.
I hope you too get some help and try physical therapy.
In my opinion it's the first step towards seeing if full mobility of the elbow can be achieved.