<s>[INST] Pain in my right knee came on suddenly. Behind the knee, the muscle on top of the knee, the inside of the knee. I do have osteoarthritis, have had two arthroscopies. Has been pain free for the last 4 years. I did nothing that would have brought on such sudden pain. Can a cold or infection settle in my knee? I have had a very bad sore throat the past 3 days. [/INST] Hello, It looks that you are afraid of arthritis pain. As recently you are having sore throat, in that case it can be associated arthralgia with sore throat. In good percentage of cases there is associated joint pain in sore throat. You need not worry about that this will go away in next 3-5 days. Meanwhile, you may have a good analgesic like ibuprofen for that. Hope I have answered your question. Let me know if I can assist you further.  </s>