The intercondylar shelf and the anterior cruciate ligament.
D001696:Biomechanical Phenomena; D006801:Humans; D007717:Knee / Q000033:anatomy & histology / Q000000981:diagnostic imaging; D007718:Knee Injuries; D008023:Ligaments, Articular / Q000033:anatomy & histology / Q000000981:diagnostic imaging / Q000293:injuries; D011859:Radiography