Final answer:
Midtarsal joint mobility is accurately assessed by examining hindfoot motion, specifically through movements at the subtalar and other intertarsal joints, which are essential for foot eversion and inversion.
Step-by-step explanation:
The midtarsal joint mobility is assessed by examining hindfoot motion, which involves the subtalar joint situated between the talus and calcaneus bones, and other intertarsal joints contributing to foot movements. This is vital for the foot to perform eversion and inversion movements efficiently.
Assessing midtarsal joint mobility does not involve measuring ankle circumference, assessing metatarsal length, or assessing transverse arch height, as none of these directly evaluate the range of motion in the hindfoot.