What condition makes a SAFO inappropriate for use?

A SAFO, or Solid Ankle Foot Orthosis, is designed to provide stability and support for the ankle and foot, primarily aiding individuals with certain motor control deficits or lower extremity weaknesses. Its primary function is to control movement at the talocrural and subtalar joints while providing a solid platform for weight-bearing.

In the case of lower motor neuron (LMN) paralysis, which is associated with flaccidity, the support offered by a SAFO may not be appropriate. LMN conditions can result in significant muscle atrophy and weakness, leading to a lack of active control over the limb. The SAFO is intended to assist individuals with some level of active muscle function; therefore, using it with someone who has flaccidity might not be effective. Additionally, the orthosis does not address the fundamental weakness of the muscles themselves, which is critical in supporting ambulation and stability.

Other conditions, such as joint stiffness or hypertonicity with intact motor control, might still be appropriately managed with a SAFO, as these conditions involve maintaining some level of motor function or coordination that the device can assist with. Neuromuscular disorders might also involve varying levels of muscle control, but if there is some preserved function, a SAFO