In which condition is the Neri Sign often observed?

• A. Cartilage damage
• B. ACL tear
• C. Sciatic radiculopathy
• D. Plantar fasciitis

Answer: (C)

The Neri sign is a clinical finding associated with sciatic nerve irritation or injury. In this sign, the patient exhibits a reflexive flexion of the knee when there is passive straight leg raising of the opposite leg. This is often seen in cases of sciatic radiculopathy due to the underlying tension and compression of the sciatic nerve. The presence of this sign indicates that the neural structures in the posterior lower extremity are affected, and it serves as an important diagnostic clue in the physical assessment of lower extremity conditions.

In contrast, cartilage damage, ACL tears, and plantar fasciitis typically involve different signs and symptoms that do not manifest through the Neri sign mechanism, as those conditions impact different anatomical structures or pathways and do not produce the same reflexive response seen with sciatic nerve issues. Therefore, the connection of the Neri sign to sciatic radiculopathy is what makes it the correct choice in this context.