Final answer:
The bony structure that can be palpated approximately one finger's width inferior from the medial malleolus and serves as an attachment site for the spring ligament is the medial talar tubercle.
Step-by-step explanation:
The bony structure that can be palpated approximately one finger's width inferior from the medial malleolus and serves as an attachment site for the spring ligament is the medial talar tubercle. It is a small bony prominence located on the medial side of the talus bone.
The talus bone is one of the tarsal bones in the foot, and it articulates with both the tibia and fibula bones to form the ankle joint. The spring ligament, also known as the plantar calcaneonavicular ligament, attaches to the medial talar tubercle and helps to support the arch of the foot.
Palpation of the medial talar tubercle can be performed by locating the medial malleolus and moving one finger's width inferior from that point.