Rib Pain after Open Heart Surgery

I had open heart surgery on April 20, 2010 where they replaced a bicuspid aortic valve and fixed an aneurysm using a graft. I have been recovering wonderfully until yesterday when I got what felt like a charlie horse in my right rib under my breast and it rapidly progressed to a really bad muscle cramp with a burning sensation in a particular place on that rib.  The doctor basically said that the muscle cramp was part of the recovery but did not know what would cause the burning sensation since my follow up visit a week ago went great. Today I have a severe burning sensation if I make even small movements in certain directions and if I maintain pressure in that area it greatly reduces the burning sensation.  The area that is burning is very specific to about the size of a quarter and hurts in the exact same spot anytime I move but quits hurting after I have been stationary for about 5 minutes.  Is this normal?  I am concerned because my recovery has been going really well and it seems to be to long since the surgery to be developing new pains.