Posterior Tibial Tendon Dysfunction

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Clinically Relevant Anatomy

The posterior tibial tendon runs posterior to the medial malleolus inserting into the navicular tuberosity and the plantar aspect of the tarsus. It is the primary stabilizer of the medial longitudinal arch, aiding in mid and hind foot locking during ambulation. If compromised, a resulting pes planus foot may develop and place greater stress on the surrounding ligaments and soft tissue. ¹

Mechanism of Injury / Pathological Process

Once thought to be a tendonitis, it is now commonly accepted the process is one of tendon degeneration or tendinosis. A poor blood supply has been identified as well as mechanical factors such as peroneal brevis overactivity or a pes planus foot. The later will gradually place increased stress to the posterior tibial tendon causing early degeneration. Trauma ( ankle sprain, fracture) may also can initiate the process. ¹

Clinical Presentation

1. Pain/swelling behind medial malleolus and along medial longitudinal arch
2. Change in static/dynamic foot ( pes planus)
3. Limited walking ability
4. Impaired balance
5. Impaired MMT PF/IV
6. Difficulty/inability to perform unilateral heel raise. Limited calcaneal inversion upon ascent
7. Impaired subtalar mobility

Diagnostic Procedures

The diagnosis of posterior tibial tendon dysfunction can be made clinically based on history and objective testing. Radiographs may be beneficial for assessing degree of deformity and degenerative changes, if present. ¹

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