Knee lifting with rattling sound is commonly caused by osteoarthritis, chondromalacia patella and other reasons, can be taken under the guidance of the doctor corresponding to the cause of the treatment, such as physical therapy, drug therapy, surgical treatment and so on. 1. Osteoarthritis: belongs to degenerative osteoarthropathy, may be related to trauma, cold and other factors, can be manifested as knee pain, lifting up the ringing and other symptoms, can pay attention to rest, follow the doctor’s instructions to use infrared and other physical methods for treatment. 2. Chondromalacia patella: it is caused by chronic damage to the patellar surface, which may be related to long-term exertion of the knee joint and developmental disorders, etc. The above symptoms may appear, and it is necessary to pay attention to avoiding strenuous activities, and ibuprofen and other medicines can be used to relieve pain when the pain is obvious, and surgical treatment can be taken if necessary. It is recommended to go to the hospital for further diagnosis and treatment in time to avoid delaying the condition. The use of drugs should follow the doctor’s instructions.