A sprained ankle usually occurs when a person lands from jumping or running on to an uneven surface. For example, sprained ankles are often seen when basketball players come down from a jump and land on another player's foot. Ankle sprains also occur with more routine daily activities such as stepping off a curb or slipping on ice.
An ankle sprain is an injury to the ligaments that support the ankle. The ligaments are structures that control excessive movement of the joint. When an ankle sprain happens, the ligament is stretched too far, and is either partially or completely torn.
There are two broad categories of ankle sprain:
The most common type of ankle sprain occurs when the foot is inverted, twisting inwards. When this type of ankle sprain happens, the outer, or lateral, ligaments are stretched too far. There are three lateral ankle ligaments that support the outer side of the joint. About 90% of ankle sprains are inversion injuries. Pain is always on the outside of the ankle, and there is usually no minimal on the inner of the joint.
The other type of sprained ankle is called an eversion injury, where the foot is twisted outwards. When this occurs, the inner ligament, called the deltoid ligament, is stretched too far. Patients will have pain on the inner side of the ankle joint.
Ankle Sprain SymptomsCommon symptoms associated with an ankle sprain are pain with swelling and bruising. The degree of symptoms tends to correlate well with the extent of the damage to the ligaments.
- Grade I Ankle Sprain:
Grade I ankle sprains cause stretching of the ligament. The symptoms tend to be limited to pain and swelling. Most patients can walk without crutches, but may not be able to jog or jump.
- Grade II Ankle Sprain:
A grade II ankle sprain is more severe partial tearing of the ligament. There is usually more significant swelling and bruising caused by bleeding under the skin. Patients usually have pain with walking, but can take a few steps.
- Grade III Ankle Sprain:
Grade III ankle sprains are complete tears of the ligaments. The ankle is usually quite painful, and walking can be difficult. Patients may complain of instability, or a giving-way sensation in the ankle joint.
When to See a DoctorIf you do have significant symptoms following a sprained ankle, you should seek medical attention. Signs that should raise concern include:
- Inability to walk on the ankle
- Significant swelling
- Symptoms that do not improve quickly or persist beyond a few days
- Pain in the foot or above the ankle
A high ankle sprain is a particular type of injury to the ligaments above the ankle. In a high ankle sprain, the ligaments above the joint are also injured. These ligaments, called the syndesmosis ligaments, connect the two shin bones (tibia and fibula), and may necessitate a longer course of rehabilitation.
surgery considered for treatment of an ankle sprain.