Which imaging is unreliable acutely for ankle sprains?

• A. MRI
• B. X-ray
• C. Ultrasound
• D. Stress radiography

Answer: (D)

In an acute ankle sprain, you want to know whether ligaments are torn or if the joint is truly unstable, but not all imaging holds up under acute conditions. Stress radiography aims to measure how much the ankle opens up under force, but in the first days after injury the combination of pain, swelling, and reflex guarding makes the joint hard to stress fully. That means the measurements reflect the patient’s pain response more than the actual ligament laxity, giving inconsistent and unreliable results. So, while other imaging like X-rays, MRI, or ultrasound can provide useful information about fractures or soft-tissue injuries, stress radiographs aren’t dependable right after an acute sprain.