Meniscal injuries can be caused by acute sports violence, or by long-term wear and tear of the meniscus due to osteoarthritis in the elderly. If it is an acute sports violence injury, hot compress is strictly prohibited within the first 48 hours of the injury, but after 48 hours, hot compress can be applied to the knee joint, the first 48 hours belong to the acute inflammatory reaction period, at this time the blood vessels are dilated, the knee joint exudates and swells significantly, the fluid in the joint increases significantly, and the pain is obvious, at this time the hot compress will further aggravate the swelling and pain. Hot compresses can be applied to dilate blood vessels, promote blood circulation, promote the absorption and remission of inflammation, and promote the reflux of swollen tissue fluid, which is conducive to the reduction of swelling. If the meniscus is torn due to osteoarthritis of the knee joint in the elderly, the usual hot compress will also have certain benefits, but it is still recommended to go to the hospital for treatment after examination.