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The condition associated with poor ankle dorsiflexion that requires an orthotic device is flatfoot deformity. Flatfoot, or pes planus, occurs when the arch of the foot collapses, resulting in a more horizontal alignment of the foot. This often leads to limited ankle dorsiflexion because the structure of the foot and ankle is altered, making it difficult for the individual to achieve the optimal range of motion during activities such as walking and running.

An orthotic device, such as an ankle-foot orthosis (AFO), may be utilized to provide support and alignment to the foot and ankle, helping to improve stability and function. By maintaining proper positioning, the orthotic assists in facilitating better gait mechanics, thus addressing the challenges posed by poor dorsiflexion.

While conditions like claw toe, excessive supination, and chronic ankle instability indeed can affect foot function, they do not primarily originate from or are defined by impaired dorsiflexion in the same way that flatfoot deformity is. Therefore, flatfoot deformity stands out as the condition that requires the use of an orthotic specifically due to its association with insufficient ankle dorsiflexion.