Ankle Fracture Clinical Presentation

Updated: Oct 26, 2016
  • Author: Kara Iskyan, MD; Chief Editor: Trevor John Mills, MD, MPH  more...
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Presentation

History

All injured patients should be evaluated for more extensive and serious trauma depending on the circumstances.

Knowledge of the trauma, such as the direction of torque force applied to the ankle and the foot's position, helps predict the nature and severity of an ankle injury. Although patients tend to recall the event, they often cannot depict the exact manner in which their injury occurred.

History of prior trauma to the affected ankle may cause antecedent laxity, instability, or radiographic abnormalities misinterpreted as an acute event.

Chronic medical condition, such as diabetes, peripheral vascular disease, and metabolic bone disease, may affect examination findings and treatment plans.

Chronic medication use is an important part of the history and has implications for management. For example, long-term use of corticosteroids may provoke premature osteoporosis, whereas nonsteroidal anti-inflammatory drugs (NSAIDs) may mitigate the degree of swelling normally expected with fractures.

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Physical

Because an ankle fracture often presents with symptoms similar to those of an ankle sprain, a complete and thorough examination of the involved extremity is needed to avoid misdiagnosis and prevent unnecessary radiographs.

Indicators suggesting fracture include gross deformity, swelling (especially perimalleolar), bony tenderness, discoloration, and ecchymosis. Inability to bear weight on the injured foot also indicates a fracture.

Corroborate any visible deformity by gently manipulating the affected area.

Inspect carefully for the presence of open wounds close to the injured ankle.

Assess the neurovascular status of the foot and ankle. Compare findings to the unaffected extremity.

  • Check presence and quality of pulse of the posterior tibial artery. A hand-held Doppler can be useful to document arterial patency.

  • Check presence and quality of pulse of dorsalis pedis artery. Note that the dorsalis pedis is congenitally absent in as many as 10-15% of the population.

  • Document the time for capillary refill.

Palpate for focal bony tenderness, especially along the medial and lateral malleoli and posterior aspect of the joint. If possible, palpate the most tender area last.

Assess passive and active range of motion of the ankle joint, noting limitations. During the immediate acute phase, most patients' ankles are too tender to cooperate with stress testing of the joint.

Examine the ipsilateral knee and foot, particularly documenting the condition of the proximal fibula and proximal fifth metatarsal.

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Causes

Multiple classification schemes are used for ankle fractures. The Lauge-Hansen system categorizes ankle fractures based on the position of the foot and the forces acting on it at the time of injury, [2] while the Danis-Weber system relies on the level of fibular fracture. Neither classification scheme has been proven to be prognostic, [3] so emergency medicine physicians usually label ankle fractures according to the number of fractures in the ankle (unimalleolar, bimalleolar, trimalleolar).

Danis-Weber classification

These fractures are classified according to location of the fracture and appearance of the fibular component. To some degree, Weber classification correlates with need for operative stabilization. Orthopedic surgeons frequently use this classification system:

  • Type A depicts a transverse fibular avulsion fracture, occasionally with an oblique fracture of the medial malleolus. These result from internal rotation and adduction. These are usually stable fractures.

  • Type B describes an oblique fracture of the lateral malleolus with or without rupture of the tibiofibular syndesmosis and medial injury (either medial malleolus fracture or deltoid rupture). These result from external rotation. These may be unstable. [4]

  • Type C designates a high fibular fracture with rupture of the tibiofibular ligament and transverse avulsion fracture of the medial malleolus. Usually, syndesmotic injury is more extensive than in type B. These result from adduction or abduction with external rotation. These are usually unstable and require operative repair.

Pilon fracture

A pilon fracture designates a fracture of the distal tibial metaphysis combined with disruption of the talar dome. An axial loading mechanism drives the talus into the tibial plafond (the distal articular surface of the tibia). A common method of trauma is a foot braced against a floorboard in an auto collision. Skiers coming to an unexpected sudden stop and victims of free fall from heights also may sustain pilon fractures. Incidence of pilon fractures ranges from 1-10% of all tibial fractures. A pilon fracture is shown in the radiograph below.

Pilon fracture in a 35-year-old man who fell 20 ft Pilon fracture in a 35-year-old man who fell 20 ft. Anteroposterior radiograph shows at least 2 fracture lines extending to the articular surface (plafond) of the tibia.

Establish vascular and integument integrity. Pilon fractures are often open. Skin sloughing is not uncommon. Subsequent edema, fracture blisters, and skin necrosis from the original injury may convert closed fractures to open injuries.

Depending on the trauma, associated injuries include spinal compression fractures (especially of L1) and ipsilateral or contralateral fractures of the os calcis, tibial plateau, pelvis, or acetabulum.

As pilon fractures are often comminuted and open, there is often significant long-term disability.

Maisonneuve fracture

A Maisonneuve fracture, shown in the image below, is defined as a proximal fibular fracture coexisting with a medial malleolar fracture or disruption of the deltoid ligament. Maisonneuve fractures are associated with partial or complete disruption of the syndesmosis.

Maisonneuve injury. Mortise view shows transverse Maisonneuve injury. Mortise view shows transverse fracture of the medial malleolus and widening of the tibiofibular syndesmosis without a fracture of the fibula. This injury is suggestive of a proximal fibula fracture (Maisonneuve fracture).

Treatment of Maisonneuve fractures depends on stability of the ankle mortise.

Tillaux fracture

A Tillaux fracture describes a Salter-Harris (SH) type III injury of the anterolateral tibial epiphysis caused by extreme eversion and lateral rotation of the ankle. Incidence is highest in adolescents, usually those aged 12-14 years, because the fracture occurs after the medial aspect of the epiphyseal plate of the tibia closes but before the lateral aspect arrests. A Tillaux fracture is shown in the radiograph below. [5]

An 11-year-old girl with juvenile Tillaux fracture An 11-year-old girl with juvenile Tillaux fracture. Mortise view shows fracture involving the lateral portion of tibial epiphysis.

Distinguish a Tillaux fracture from a triplane fracture. Triplane fracture is a combination of a SH II and III fracture and is more likely than a Tillaux fracture to require open reduction and internal fixation. A triplane fracture is shown in the radiograph below.

A 13-year-old girl with triplane fracture. Anterop A 13-year-old girl with triplane fracture. Anteroposterior radiograph shows a sagittal component through the distal tibia epiphysis.

Pott fracture

Bimalleolar fractures, termed Pott fractures, involve at least 2 elements of the ankle ring. These fractures should be considered unstable and require urgent orthopedic attention.

Cotton fracture

A trimalleolar, or Cotton, fracture involves the medial, lateral, and posterior malleoli. These fractures are considered unstable and require urgent orthopedic attention.

Snowboarder's fracture

With the popularity of snowboarding in the late adolescent and young adult population, it is likely the emergency physician will come across a fracture of the lateral process of the talus, the so-called snowboarding ankle fracture. [6, 7]

A combination of dorsiflexion and inversion of the ankle produces the lateral talar fracture.

A high index of suspicion should be used in snowboarders who complain of lateral ankle pain with a normal-appearing ankle radiograph. Computed tomography imaging is often required to diagnose a talus fracture.

Hyperplantarflexion variant ankle fracture

The ankle fracture “spur sign” was found to be highly associated with the hyperplantarflexion variant ankle fracture, as determined by assessment of injury radiographs. This fracture is composed of a posterior tibial lip fracture with posterolateral and posteromedial fracture fragments separated by a vertical fracture line. The spur sign is a double cortical density at the inferomedial tibial metaphysis. In this study, the incidence of the hyperplantarflexion variant fracture among all ankle fractures was 6.7% (43/640). The spur sign was present in 79% (34/43) of variant fractures and absent in all nonvariant fractures, conferring a specificity of 100% in identifying variant fractures. Positive predictive value and negative predictive value were 100% and 99%, respectively. [8]

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