Technically it's known as the patella
This tendon technically is not a ligament because of the... [DOC] [TLE] Knee Anatomy Pictures: Bones, Ligaments, Muscles, Tendons ... [PAR] Aug 20, 2016 ... Femurcommonly called the thigh bone; it's the largest, longest and ... Patellar 
ligament  attaches the kneecap to the tibia ... Tendons are elastic tissues that 
technically part of the muscle and connect muscles to bones.