Narrowing of the knee joint space is usually caused by osteoarthritis of the knee and joint degeneration. Narrowing of the knee joint space can be improved by general treatment, physical therapy, medication and surgery. 1. General treatment: In the early stage of knee joint gap narrowing, it is usually accompanied by a certain degree of pain, activity limitation and joint swelling. At this time, it is necessary to pay attention to appropriate rest, avoid walking for a long time, avoid sitting and standing for a long time. When you move your knee, you can wear knee pads and braces to avoid excessive knee movement. 2. Physical therapy: Narrowing of the knee joint gap can be treated with physical methods, such as hot compresses, physical therapy, massage, acupuncture and so on. It is good for cartilage wear and tear, meniscus damage, pain, and activity limitation caused by narrowing of knee joint gap. 3. Medication: The narrowing of the knee joint gap can be used externally with blood-activating and pain-relieving creams, anti-inflammatory and pain-relieving creams, etc. When the knee joint is painful, non-steroidal anti-inflammatory drugs such as ibuprofen delayed-release tablets, celecoxib capsules, and etoricoxib tablets can be used to alleviate the pain. 4. Surgery: When the knee joint is deformed and the pain is unbearable, and the conservative treatment is ineffective, surgery can be used, such as unicondylar replacement, total knee replacement and so on. Before surgery, it is necessary to evaluate the patient’s physical condition, the severity of knee joint disease, etc., and choose the appropriate surgical method. Patients with narrowed knee joint space should follow the doctor’s instructions and actively cooperate with the doctor’s treatment, do not use medication on their own, so as not to delay the condition.