Spry Juncture, LLC
How to Evolve Gracefully
Tibialis Posterior
Region
Origin & Insertion
['Origin: Posterior tibia and fibula, interosseous membrane', 'Insertion: Navicular, cuneiforms, cuboid, and bases of 2nd–4th metatarsals']
Synergistic Muscles
['Flexor digitorum longus', 'Flexor hallucis longus']
Joints
['Ankle', 'Subtalar']
Primary Actions
['Inversion', 'Plantarflexion', 'Arch support']
Nerve & Spinal Segment
Tibial nerve
Sacral plexus; L4–S1
Interesting
Primary dynamic arch supporter. [Gray’s]
Reversal of Action
Lift tibia inward via arch activation
Common Dysfunctions
Flatfoot, posterior tibial tendon dysfunction
How to Stretch
Eversion stretch with dorsiflexion.
Trigger Points
How to Strengthen
Resisted inversion with PF.
Concentric Action
Invert and plantarflex foot
Applications:
Supports medial arch and is critical in flatfoot rehab
Eccentric Action
Control foot lowering from tiptoe or eversion
Isotonic Action
Arch lifts or resisted inversion
Related Conditions
['Overpronation', 'Shin splints']
Isometric Action
Hold foot in arch-raised position
Exercise Ideas
['Band inversion', 'Towel scrunch', 'Arch raises']