Inversion refers to motion in the frontal plane. If the foot is inverted it means the sole of the foot is tilted so that it faces more towards the mid line of the body. The most common sprain is an “inversion sprain”, that is the foot inverts abnormally at the ankle injuring the support ligaments.

Eversion is the exact opposite to inversion. In this case the sole of the foot is tilted to face away of the mid line of the body. Eversion is the term we most commonly associate with abnormal pronation. There is often very visible eversion of the heel bone in an abnormal pronator.