I broke my little finger in june of this year, despite going to hand rehab it is bent and i cannot straighten?

Good afternoon: You might have a vicious consolidation, that could be that the bone is repaired by now but in a non anatomical position which is causing that problem, another possible situation is that you had an extensors tendon injury. I recommend you to see an orthopedic surgeon to get an Xray of your hand and evaluate the bone consolidation to see if that might be the problem.