What is the action of the tibialis posterior muscle?

The tibialis posterior muscle plays a crucial role in foot and ankle mechanics, primarily responsible for plantar flexion of the ankle. Its placement beneath the calf muscles means that when it contracts, it pulls on the bones of the foot in a manner that points the toes downwards, contributing significantly to movements such as walking, running, and standing on tiptoes.

In addition to plantar flexion, the tibialis posterior also supports the medial arch of the foot and assists in inversion, which is the turning of the sole of the foot inward. These functions are essential for overall stability and balance while performing various physical activities.

Understanding the specific actions of this muscle helps in recognizing its importance during sports massage therapy and rehabilitation, especially for athletes who may be susceptible to injuries related to ankle instability or flatfoot conditions. Knowing how to locate and work on the tibialis posterior can aid in alleviating tension and promoting better function in the lower extremities.