Which condition is a contraindication for using an AAFO?

Ankle-foot orthoses (AAFOs) are designed to provide support and stability to the ankle and foot, particularly aiding in conditions that affect mobility and limb function. In the context of lower motor neuron (LMN) paralysis, which is characterized by flaccidity and reduced muscle tone, the use of an AAFO is not suitable.

In cases of LMN paralysis, muscle control is significantly compromised. The lack of muscle tone and strength can lead to challenges in maintaining proper alignment and stability within the orthosis. An AAFO requires sufficient muscle function to effectively control the position of the foot and ankle to prevent malalignment or abnormal movement patterns. The dynamic nature of flaccid paralysis might result in the orthosis being ineffective or even potentially causing further complications, as it cannot rely on muscle activation to maintain proper fit and functionality.

Other conditions like spinal cord injury, muscle weakness, and joint instability may still allow for effective use of an AAFO, as these situations typically present differing degrees of muscle activity or joint mechanics that can be accommodated by the orthosis. For instance, individuals with muscle weakness may still retain enough active control to use an AAFO effectively, while those with joint instability can benefit from the supportive nature of the device to mitigate the