Final answer:
Pes Planus is also known as flat feet, where the longitudinal arch of the foot collapses, often due to excessive stretching of the supporting ligaments.
Step-by-step explanation:
Pes Planus is more commonly known as flat feet. This condition is characterized by the collapsing or depression of the longitudinal arch of the foot, especially on the medial side, causing the entire sole to come into complete or near-complete contact with the ground.
The longitudinal arches are supported by ligaments and when these ligaments are excessively or repeatedly stretched, particularly due to factors like being overweight, standing for long durations, or extensive walking or running, it can lead to the development of flat feet. Flat feet can lead to foot pain due to the strain on the ligaments and other supporting structures of the foot.
Other foot-related conditions mentioned include plantar flexion, pronation, and protraction, but they do not describe Pes Planus. The correct answer for the condition also known as Pes Planus is option 1) Flat feet.