The plural of meniscus is menisci or meniscuses.
A meniscus is a crescent-shaped piece of cartilage found in certain joints of the body, most commonly in the knee joint. It acts as a cushion or shock absorber between the bones, providing stability, lubrication, and load distribution. The menisci are prone to injuries, such as tears, which can cause pain, swelling, and restricted movement. In some cases, surgical intervention may be required to repair or remove the damaged meniscus. The plural form of meniscus is menisci, although the term meniscus is sometimes used as a collective noun to refer to both singular and plural instances.
The graph shows the occurances of the plural of meniscus in written English since 1800 using Google's Ngram Viewer.