Tibialis Posterior
Leg & Ankle
A key dynamic supporter of the medial arch — tibialis posterior tendon dysfunction is a leading cause of adult-acquired flatfoot and progressive arch collapse.
Function
Inverts and plantarflexes foot; supports medial arch
Origin
Posterior tibia, fibula, and interosseous membrane
Insertion
Navicular, cuneiforms, cuboid, and metatarsals 2-4
Innervation
Tibial nerve (L4-L5)