Which of the following is a contraindication for a PLS orthosis?

PLS (Posterior Leaf Spring) orthoses are designed to assist with dorsiflexion and provide support during the stance phase of gait for individuals with certain neurological conditions. The correct response identifies a contraindication related to mod/severe hypertonicity.

Hypertonicity refers to excessive muscle tone, which can significantly affect movement control and overall function. In cases of moderate to severe hypertonicity, the stiff and resistant muscles may not allow the orthosis to function effectively. The degree of spasticity can limit the range of motion and result in difficulties during gait, possibly leading to increased potential for skin breakdown or discomfort while wearing an orthosis not designed to accommodate such increased tone.

The unique design of the PLS, which primarily benefits those with manageable muscle tone, means it is less suited to individuals where hypertonicity is predominant, as it cannot provide the necessary support and functionality to mitigate the effects of overactive muscles. Thus, the correct identification of mod/severe hypertonicity as a contraindication highlights the importance of considering the individual's muscle tone in orthotic design and selection.