What is the normal eversion ROM of the ankle?

• A. 20 degrees
• B. 40 degrees
• C. 10 degrees
• D. 30 degrees

Answer: (A)

Turning the sole outward at the ankle, known as eversion, is a motion mainly at the subtalar joint. The typical, normal range for this movement is about twenty degrees. This amount strikes a balance between the ligaments and bones that limit excessive motion and the need for foot adaptability on uneven surfaces. In practice, thirty degrees is more commonly associated with inversion, not eversion, while ten degrees would be considered quite limited and forty degrees would be beyond the normal range for a healthy ankle. So twenty degrees best reflects the standard eversion ROM.