Tendinopathy is an injury to the tendon. It can cause pain, swelling, and limit movement. The injuries can include:

  • Tendonitis—an inflammation of the tendon
  • Tendinosis—tiny tears in the tendon with no significant inflammation

The posterior tibial tendon runs from the posterior tibial muscle to the inside of the ankle and the arch of the foot. The main job of this tendon is to support the arch of the foot. If the tendon is injured or weak the arch of the foot can collapse. This will make the foot pronate, or roll inward. These injuries can make it painful to walk.

Treatment depends on the severity of the tendinopathy.

Tendonitis
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Causes of posterior tibial tendinopathy include:

  • Overuse of the tendon
  • Poor blood supply to the tendon
  • Biomechanics that cause degeneration of the tendon, such as over pronation of the foot