The Inverted Supinator Sign aims to assess which condition?

The Inverted Supinator Sign is a clinical test used primarily to assess for cervical myelopathy, which is a condition that results from compression of the spinal cord in the cervical region. This test evaluates the integrity of the C6 and C7 nerve roots.

When a practitioner performs the Inverted Supinator Sign, they typically strike the brachioradialis tendon, usually producing a forearm flexion response if the nerves are functioning properly. However, in cases of cervical myelopathy, this reflex can be diminished or absent, indicating a disruption in the neural pathways due to the spinal cord compression.

This sign specifically helps differentiate between upper motor neuron lesions and lower motor neuron lesions, making it a useful tool in the clinical examination for cervical myelopathy.

The other conditions listed, such as scaphoid instability, pelvic floor dysfunction, and de Quervain's tenosynovitis, do not pertain to the cervical spine or the reflex pathways assessed by the Inverted Supinator Sign, and therefore are not relevant to this specific clinical test.