<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing knee weakness and swelling. It is affecting my daily activities and I am unable to walk properly.  <response>: Based on your symptoms, it seems like you may be suffering from Osteochondrosis. It is a condition where the bone and cartilage in a joint break down, causing pain, weakness, and swelling in the affected area. 