I had a complete knee replacement. About six weks ago. I hade one fall since then. My knee keeps filling up with blood. Ive had the blood drawn two times. and sent off. It came bace with no curlters. but my syrgon. prescbed . me oxzcodone 30 mg. Well I looked it uo on the PILL I D. ON one side it has a M incased with a box. The other side Just has a30 on it. and it is White And Round. The only thing I can find says. it should be blue. This is though though the V.A System. It does not seem to be helping when, mt knee sweels with blood. Can you give me any idea were this blood may be coming from. And Is med. is correct. This would not be the first time I have gotten the wrong meds, from the V.A.