Recovering from a dislocated elbow?

I dislocated my elbow 1 year and 4 months ago and I have healed alot from it. But i still cant straighten it all the way, like there could be another 2 cm or so of extra straightening left, unlike my left arm. I was wondering if there was anything i could do it get it completely straight again? I already went to physical therapy and they did what they could.