Danis–Weber classification
Classification of ankle fractures by fibular fracture location.
The Danis–Weber classification (commonly called the Weber classification) sorts ankle fractures into three types—A, B, and C—depending on where the distal fibula breaks.
In a Type A fracture, the fibula breaks below the tibiofibular syndesmosis (the connection between the lower ends of the tibia and fibula). This fracture sits below the ankle joint, the syndesmosis stays intact, and the deltoid ligament is also intact. The medial malleolus may sometimes fracture. Type A fractures are usually stable, though they occasionally need open reduction and internal fixation (ORIF), especially if the medial malleolus is broken.
Type B involves a fibula fracture at the level of the syndesmosis. The break occurs at the ankle joint and extends upward and outward along the fibula. The syndesmosis may be intact or only partially torn, but there is no widening of the distal tibiofibular joint. The medial malleolus might fracture, or the deltoid ligament might tear. Stability varies with this type.
Type C fractures occur above the syndesmosis. The fibula breaks above the ankle joint, the syndesmosis is disrupted, and the distal tibiofibular articulation widens. A medial malleolus fracture or deltoid ligament injury is present. These fractures are unstable and require ORIF.
Types B and C involve some damage to the syndesmosis itself, which cannot be seen directly on X-ray. They are inherently unstable and more often need surgical repair for a good outcome. Type A fractures are generally stable and can be treated with simple measures like a plaster cast.
- field
- Orthopedic surgery
- known_for
- Danis–Weber classification of ankle fractures
Lore & Background
The Danis–Weber classification categorizes ankle fractures into three types according to the level of the fibular fracture relative to the tibiofibular syndesmosis. Type A fractures occur distal to the syndesmosis, below the ankle joint, with the syndesmosis intact and the deltoid ligament intact; the medial malleolus is occasionally fractured. These fractures are usually stable but may require open reduction and internal fixation if the medial malleolus is fractured.
Type B fractures occur at the level of the syndesmosis, extending superiorly and laterally up the fibula. The syndesmosis may be intact or only partially torn, with no widening of the distal tibiofibular articulation. The medial malleolus may be fractured or the deltoid ligament torn, and stability is variable.
Type C fractures occur proximal to the syndesmosis, above the ankle joint. The syndesmosis is disrupted with widening of the distal tibiofibular articulation, and a medial malleolus fracture or deltoid ligament injury is present. These fractures are unstable and require open reduction and internal fixation.
Reader's Guide
The Danis–Weber classification is a widely used system for describing ankle fractures, based solely on the location of the fibular fracture relative to the tibiofibular syndesmosis. Its three types—A, B, and C—provide a straightforward framework for assessing fracture stability and guiding treatment. Type A fractures, occurring below the syndesmosis, are typically stable and managed conservatively, though medial malleolar involvement may necessitate surgery. Types B and C, involving the syndesmosis at or above its level, imply damage to the syndesmosis itself, which cannot be directly visualized on X-ray. These types are inherently unstable and more likely to require operative repair for a good outcome. The classification's simplicity aids in communication among clinicians and in treatment planning, though it does not account for all variables such as ligamentous injuries beyond the syndesmosis. It is often used alongside the Lauge-Hansen classification for a more comprehensive assessment.
Did You Know?
- The Danis–Weber classification has three types: A, B, and C, based on the location of the fibular fracture.
- Type A fractures are usually stable and can be managed with simple measures such as a plaster of paris cast.
- Types B and C imply damage to the syndesmosis, which cannot be directly visualized on X-ray.
- Type C fractures are unstable and require open reduction and internal fixation (ORIF).
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