What is the primary function of the tibialis posterior muscle?

Study for the NPTE Physical Therapist Assistant Exam. Ace the test with comprehensive flashcards and multiple-choice questions. Each query offers hints and detailed explanations. Get thoroughly prepared for your examination!

The primary function of the tibialis posterior muscle is to provide plantarflexion and inversion of the foot. This muscle is located deep in the posterior compartment of the leg and plays a crucial role in maintaining the medial arch of the foot. During the gait cycle, it assists in stabilizing the foot, especially during the push-off phase, by enabling the foot to turn inward (inversion) while pushing the body forward. This action also contributes to the overall stability of the ankle and foot complex, making it essential for activities such as walking, running, and jumping.

While dorsiflexion is the function of other muscles like the tibialis anterior, knee flexion pertains to muscles such as the hamstrings that work on the knee joint rather than the ankle, and eversion involves different muscles like the peroneals that move the foot outward. Therefore, the tibialis posterior's role in plantarflexion and inversion is vital for proper foot mechanics and balance.

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