Ok, first let me welcome you to PetTalk. I'm sure you will find it as addicting as the rest of us.
Second, that story brought tears to my eyes and broke my heart. I feel so sorry for that baby and so sorry for you. That must have been a horrible experience for you and I applaud you for doing everything you can to save the little one. A cat with three legs can function quit well and live a good long and happy life and I'm so glad you didn't let them put him down!
I'm guessing that there is no infection in the leg but an abcess from the bite? I volunteer at a shelter and currently they have several cats that have bad abcess's that are really nasty once they open up. They do usually heal ok but it takes some time if it is a bad and deep one.
I can only imagine how guilty you must feel because I know I would have just been sick! Unfortunately cats and kittens do get into bad places and it is common for them to be hurt in cars. I think you did a wonderful thing by helping him and especially for sticking it out with the little one.
I will have to think on a name but I just wanted to say welcome and let you know that prayers are on the way for a quick healing for this precious baby. I think you will find a fountain of information here and tons of support to help you get through this. He certainly is a cutie and I'm sure he will capture many more hearts than just mine.
What a little doll baby and please keep us posted on how he is doing. I will come back later with a name suggestion.
I'm in love with this little one already!