The popliteal lymph nodes are behind the knee. Conditions such as infections and autoimmune conditions can cause swelling, but it is rarely due to cancer. Learn more.

Removing the muscle relieves compression on the popliteal artery, reducing a patient's symptoms and pain. Lyden is one of a handful of surgeons in the U.S. who do the procedure.

Popliteal artery entrapment syndrome (PAES) is a rare blood vessel condition that is most likely to develop in young male athletes. It causes pain while walking, which improves while at rest.