The cause of a meniscus tear depends on whether it is an acute tear or a degenerative tear. An acute tear of the meniscus is often sports related. It usually results from the combination of weight bearing and twisting. For example, twisting or turning quickly while the foot is planted and the knee is bent can result in an acute meniscus tear. Degenerative tears of the meniscus are more common in older people. As we age, the meniscus weakens and loses elasticity—which can result in tears. Often, people with degenerative tears can’t recall a specific event or injury—but they begin experiencing symptoms such as swelling or the knee locking or catching.