Did this injury happen at work?
Do you have a letter from your doctor stating that you needed to be off work due to this injury?
This is a tough call. Do you have any type of handbook that has the company policies in it? I'm the type that just goes straight to the top, but in these economic times it's risky, as there is a line of people waiting for your job. We own our own business and suppliers are not even honoring our contracts, everything is in their favor because an attorney cost a lot of money to fight this. You could talk to labor relations (ACLU) and see if they can help you, otherwise I'd look for another job which as you know isn't easy to do right now. You need to get above middle management to someone who is capable and able to make decisions. I'm sure you have an HR dept. there, try talking to them about this. Stay calm and professional when doing this. I wish I could be of more help, they should appreciate someone who values their job so much! I do wish you all the best and good luck!