Identify the anatomical location being described: the posterior part of the knee.
Review the anatomical terms provided: Hallux, Patellar, Popliteal, and Sural.
Understand the meaning of each term: 'Hallux' refers to the big toe, 'Patellar' relates to the kneecap or anterior part of the knee, 'Popliteal' refers to the area behind the knee, and 'Sural' pertains to the calf region.
Determine which term correctly describes the posterior part of the knee by matching the definitions with the anatomical location.
Conclude that 'Popliteal' is the correct term for the posterior part of the knee, as it specifically refers to the area behind the knee joint.