<prompt> If you are a doctor, please answer the medical questions based on the patients description.my husbands knees give way and are very painful but last night when he sat down a lump of what i think was gristle showed from the right side of his left knee which was etremely painful for him till it disapeared he is waiting for some results from knee xrays  <response>: Hi, dairy have gone through your question. I can understand your concern. You may have some meniscus or ligament injury. Wait for the x-ray results. If it is normal then go for MRI knee. It will give you exact idea about soft tissue injury. Then you should take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. 