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Corrective Exercise Solutions: Foot and Ankle Pain FEET AND ANKLE MUSCLES TIBIALIS POSTERIOR The Tibialis Posterior is located on the back of the lower leg and under the foot. Tibialis Posterior MUSCLE SPECIFICS The tibialis posterior originates near the top of the lower leg on the back of the tibia and fibula. It runs down the back of the leg and then wraps around the inside of the ankle bone where it inserts in the middle of the underside of the foot. MUSCLE ACTION(S) The tibialis posterior helps invert the foot and ankle (i.e., rolls it outward) and push down the ankle and foot (i.e., plantar flexion). REAL LIFE MOVEMENTS In real life movements like jogging the tibialis posterior lengthens under load like a bungee cord to help hold up the medial longitudinal arch and transverse arches and slow down forces to the ankle joint. This helps it slow down internal rotation of the tibia to resist overpronation. As the muscle lengthens this stores energy in the tissues to enable the ankle to then supinate and the foot to push down (i.e., plantar flex). REAL LIFE MOVEMENT EXAMPLE The tibialis posterior helps maintain the integrity and strength of the medial longitudinal arch of the foot and helps create a powerful push-off when walking or running. HELPFUL TIPS Pain caused by irritation of the tibialis posterior can feel like symptoms of plantar fasciitis. ©2016 The BioMechanics Method. All rights reserved.