What type of orthotic device is appropriate for posterior tibial tendon dysfunction?

A rigid orthotic device is suitable for managing posterior tibial tendon dysfunction because it provides the necessary support and stability to the foot and ankle. This condition often results in flatfoot deformity due to the inadequacy of the posterior tibial tendon to support the medial arch. By using a rigid device, the foot is held in a position that prevents excessive motion at the subtalar joint, thereby reducing strain on the affected tendon. The firmness of a rigid orthotic can also help to manage any associated pain by controlling subtalar motion and providing a good platform for the foot during ambulation, promoting better alignment and function.

In contrast, accommodative devices focus on reducing pressure and accommodating for deformities rather than providing substantial support or correction. Varus or valgus posted devices are specifically designed to correct alignment issues in the frontal plane rather than address the underlying instability or dysfunction associated with the posterior tibial tendon. Thus, these options do not align with the therapeutic goals for posterior tibial tendon dysfunction.