The tibialis posterior muscle is the most central of all the leg muscles, and is located in the deep posterior compartment of the leg. It is the key stabilizing muscle of the lower leg.
Posterior tibial tendonitis
Posterior tibial tendonitis is a condition that predominantly affects runners and active individuals. It involves inflammation or tearing of the posterior tibial tendon, which connects the calf muscle to the bones on the inside of the foot. It plays a vital role in supporting the arch and assisting in foot movement. This condition can cause pain, swelling, and potentially lead to flatfoot if left untreated.
Structure
The tibialis posterior muscle originates on the inner posterior border of the fibula laterally. It is also attached to the interosseous membrane medially, which attaches to the tibia and fibula. The tibialis posterior has a major role in supporting the medial arch of the foot. Dysfunction of the tibialis posterior, including rupture of the tibialis posterior tendon, can lead to flat feet in adults, as well as a valgus deformity due to unopposed eversion when inversion is lost.
Clinical significance
Injury to the distal tendon of the tibialis posterior muscle is rare.
Additional images
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File:Gray357.png|Coronal section through right talocrural and talocalcaneal joints.
File:Gray551.png|The popliteal, posterior tibial, and peroneal arteries.
File:Slide1ACA.JPG|Muscles of the back of the leg. Deep layer.
File:Slide2ACA.JPG|Muscles of the back of the leg. Deep layer.
File:Slide2ACCA.JPG|Muscles of the leg. Posterior view.
File:Slide1ADA.JPG|Muscles of the sole of the foot.
File:Slide3Bubu.JPG|Dorsum of foot. Ankle joint. Deep dissection
File:Slide2bubu.JPG|Dorsum of foot. Ankle joint. Deep dissection.
File:Slide2wewe.JPG|Ankle joint. Deep dissection. Medial view
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