Review Question - QID 210236

A 10-year-old girl presents for a routine pre-sport participation physical examination. She is active in soccer but has complained of lateral ankle and foot pain after activities over the past few years. She has no laxity on examination with anterior drawer or talar tilt testing, but intrinsic wasting of the hands are noted. A standing clinical view of her feet are shown in figure A. There is a family history of similar foot positioning abnormalities. What is the next step in making a diagnosis of the most common underlying condition?