An ankle fracture (or “broken ankle”) is a break or multiple breaks in one or more of the bones in the ankle joint. It is usually caused by a rotational injury (twisting, turning or rolling) of the ankle, but can also be caused by an impact, such as from a fall or automobile collision. Breaks that occur suddenly (during a specific incident or injury) are known as traumatic ankle fractures. But fractures can also occur slowly due to repetitive stress or injury over time. These are called stress fractures.
In the short term, it is painful and temporarily disabling. In the long term, if not properly treated, a broken ankle can lead to significant complications and debility.
The ankle joint is composed of the three bones – the tibia (shinbone), the fibula (outer ankle bone), and the talus (which is the bone that connects your leg to your foot).
Ligaments connect bone to bone to provide stability of the joints. They are commonly injured in the case of ankle sprains. They can also be injured in connection with ankle fractures. When ligaments are torn and associated with an ankle fracture, this damage can render the ankle unstable. The deltoid ligament is found on the inner part of the ankle and provides the majority of the stability of the ankle. If the deltoid ligament is torn in association with a fracture, the ankle is generally unstable.
In the ankle joint or any joint in the body, two or more bones move relative to one another. There is a cushion or lining between the bones, which is called cartilage. Thinning or damage to this cushion can lead to arthritis or inflammation in the joint.
We think of the ankle as having three sides and a roof, and fractures can occur in each of these areas or in combination.
As the number of fracture lines increase, so does the risk of long-term joint damage. Trimalleolar ankle fractures and pilon fractures have the most cartilage injury and, therefore, have a higher risk of arthritis in the future.
Within each of the above types, the fracture will be either:
There are some additional, unique types of fractures.
A Maisonneuve fracture, for example, involves a complete disruption of the ligaments around the ankle associated with a fracture of the fibula at the level of the knee. For this type of injury, an ankle X-ray may not show a fracture or demonstrate the instability associated with this injury, because the actual bone fracture is well above the ankle, and the ligament injuries can only be seen with other forms of imaging, such as an MRI.
The most common symptoms of an ankle fracture are pain and swelling, either of which may be present only in the ankle region itself or spread to parts of the foot or up toward the knee. Any pain will usually be more intense if the injured person tries to put weight on the ankle. Contusions (bruises) are also usually present. In a severe break, the ankle may appear to be deformed or have bone protruding out of the skin.
X-rays are usually required to determine whether there is a broken bone as opposed to a soft-tissue injury like a sprain, since ankle sprains and breaks have similar symptoms. Other radiology imaging, such as a CT scan or MRI, may be needed to determine the full scope of the injury.
If the imaging shows that a person has a fractured ankle, he or she should consult an orthopedic surgeon as soon as possible. There are several different types of ankle breaks, and not all require surgery. But when they do, it is important that they receive the appropriate surgery by a skilled foot and ankle specialist. An inappropriate or poorly executed surgery can lead a patient to require additional corrective surgeries and/or, years later, to develop ankle instability, arthritis or even the need for an ankle replacement operation. Early and correct intervention is the key to preserving the ankle joint over the long term.
Treatment is based on the alignment of the bones and the stability of the ankle joint. The goal is to have the bones heal as closely to perfect as possible so as to prevent any residual instability or malalignment of the bone. A malalignment of as little as two millimeters in the ankle joint can lead to arthritis. It is much easier to fix a fracture than to treat arthritis in the future. Certain mild ankle breaks (stable and with no displacement) can be treated nonsurgically with a splint, short leg cast, or other protective device such as a walking boot Some patients may be able to walk immediately while wearing a support while others may have to use crutches to limit weightbearing.
For more serious fractures in which bones or bone fragments are misaligned, surgical intervention is necessary to prevent improper healing (malunion) that would impede proper movement in the ankle and possibly lead to other complications.
It takes about six weeks for bones to heal. It may take longer for ligaments or other soft tissues to heal as well.
After surgery, patients are typically not weightbearing for 4 to 6 weeks until the bone heals. Patients are placed on a pain management protocol that minimizes their need for opioid medications. For the first couple of weeks, patients are in a splint and are elevating the limb 90% of the day. After 10 to 14 days, the sutures are removed and patients are typically placed into a removable boot. This allows patients to start moving the ankle and to shower. At the six-week visit, X-rays are obtained. Assuming the bone is healed well, patients are then allowed to start weightbearing and to begin physical therapy. Patients will generally have six weeks of therapy or more if required.
Read the below articles for discussions on pediatric ankle fractures and stress fractures.