Final answer:
Pes planus, also known as flat foot or fallen arches, is the condition characterized by flat feet and adducted and internally rotated knees.
Step-by-step explanation:
The condition characterized by flat feet and adducted and internally rotated knees is called Pes planus. Pes planus, also known as flat foot or fallen arches, occurs when the supporting ligaments of the longitudinal arches are stretched and weaken. This can happen due to factors such as prolonged standing or excessive stretching of the ligaments.