If the knee joint is squatting, it is more common for middle-aged and elderly people to have degenerative osteophytes or free bodies in the knee joint. In young people, it is more common to have a meniscal injury of the knee, so it is important to go to the orthopedic department and see a doctor for an initial analysis, taking into account the physical examination. If it is a meniscal injury, the McSweeney’s test will be positive and there may be symptoms of entrapment in addition to a ringing sound. If a meniscal injury is considered, an MRI of the knee can be done to help determine this. If it is degenerative osteoarthritis or free body, it can be determined by knee x-ray. Depending on the results of the examination, the appropriate treatment will be done. If it is a meniscal injury, arthroscopic surgery will be required for severe cases. If it is degenerative osteoarthritis, intra-articular injection of sodium vitreous acid can help improve it.