ISS 2004

Abstract During an MRI examina-tion of the knee in a 48-year-old pa-tient suffering from degenerative changes of a partly resected medial meniscus and concomitant osteoar-thritis of the knee joint, an unusual variant of an accessory muscle in the popliteal fossa was found. To our best knowledge this muscle has never been described before. Because of the close relationship to the popliteal muscle with regard to course and lo-calisation in the deep popliteal fossa ventral to the popliteal artery, the term “accessory popliteal muscle ” is proposed