Get a referral to a Vet practice that specializes in surgery. The injuries you are describing sounds as though pins will need to be inserted to aid healing. Surgery should be done in the next 7-10 days.

Rimadyl (not one of my favorite doggy drugs) is most effective against chronic pain rather than acute pain. It will not do much for this type of traumatic injury. Again ask the Vet for Torbutrol in place of the Rimadyl. A dose of 2.5-5 mg of Torbutrol 2x daily will make the dog comfortable.

Also prior to any surgery the swelling would have to be alleviated. Low dose Prednisone would help to bring the inflammation down.

If there were witnesses to the accident and post events, you should pursue the matter with the local ASPCA.