While the pinky toe, along with the other toes, plays a role in maintaining a person's balance, Dr. Johnson at Popular Science states that a person could function properly without that particular toe. According to the Dartmouth Medical School, it is the least important toe in terms of balance.
The pinky toe has its own tendon. The tendon that is attached to the pinky toe comes from the abductor digiti minimi and the flexor digiti brevis muscles, according to Wikipedia. This allows it to flex and extend, as well as abduct and adduct, in order to change the shape and orientation of the foot, particularly on uneven surfaces.