As he mentioned towards the end of his passage, one of the differences he states is, “1. Signs are what a doctor sees, symptoms are what a patient experiences.” if i might add that when he means what a doctor “sees” also means what is smelt, felt, tasted(in rare cases of diagnosis), hear, and sees or the 5 senses. This is the difference that he is talking about when differentiating between a sign and a symptom. A simpler way to word this is that it is all observed by perspective. A fever can be felt and seen by a doctor making it a sign but it can also be a symptom do to the fact that the patient also experiences the fever. So you are right, but technically it is not a special case because there are also other symptoms/signs that fall under this category.
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Arthroscopy is surgery done with an arthroscope. This special tool has a lens and a light on it. It lets your doctor see inside your joint. You’ll get general anesthesia, then the doctor will make a small cut in front of your ear and insert the tool. It’ll be hooked up to a video screen, so he can examine your joint and the area around it. He may remove inflamed tissue or realign the disc or joint. This type of surgery, known as minimally invasive, leaves a smaller scar, has fewer complications, and requires a shorter recovery time than a major operation.