The high ankle sprain is an injury to the ankle that involves the ligaments that connect the tibia and fibula, known as syndesmosis. Injuries occur when the foot/ankle experiences a high impact force into ankle eversion or dorsiflexion, causing a sprain or injury to the high ligaments of the ankles. This high ankle sprain is known as the syndesmotic ankle. This sort of ankle sprain or injury is common in sports that require high-impact cutting maneuvers performed in the NBA and NFL.
High Vs. Low
All ankle sprains generally occur during a high-impact injury to the foot and ankle. A low ankle sprain is an injury to the ligaments that connect the fibula to the talus on the outer ankle, known as the anterior talofibular ligament. This injury occurs below the fibula, known as a low ankle sprain or just an ankle sprain—the most common acute ankle injury.
A high ankle sprain is an injury to the ligaments that connect the tibia and fibula. The injury or sprain occurs to ligaments that hold the tibia and fibular together above the foot, thus referred to as a high ankle sprain or syndesmotic ankle.