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Weber Fracture: Types A, B, C – Symptoms & Treatment

A Weber fracture is a break of the lateral malleolus at the ankle joint. It is classified into three types (A, B, C) based on the fracture level relative to the syndesmosis.

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Things worth knowing about "Weber fracture"

A Weber fracture is a break of the lateral malleolus at the ankle joint. It is classified into three types (A, B, C) based on the fracture level relative to the syndesmosis.

What Is a Weber Fracture?

A Weber fracture is a break of the lateral malleolus – the bony prominence at the outer side of the ankle, formed by the lower end of the fibula. The classification system was developed by Swiss orthopaedic surgeon Bernhard Georg Weber and remains the most widely used system for categorizing ankle fractures worldwide. The key criterion is the location of the fracture line in relation to the syndesmosis, the ligamentous connection between the tibia (shinbone) and fibula (calf bone).

Classification: Weber Types A, B, and C

The Weber classification divides lateral malleolus fractures into three types:

Weber A: The fracture is located below the syndesmosis. The syndesmosis remains intact. This type is considered stable and is usually managed conservatively.
Weber B: The fracture occurs at the level of the syndesmosis. The syndesmosis may be intact or partially injured. Treatment depends on the stability of the joint.
Weber C: The fracture is situated above the syndesmosis. The syndesmosis is typically disrupted. This type is unstable and almost always requires surgical treatment.

Causes and Mechanism

Weber fractures are most commonly caused by:

Twisting or rolling the ankle inward or outward (inversion or eversion injuries)
Sports injuries, particularly in football, basketball, skiing, and running
Falls from low to moderate heights
Traffic accidents

Athletically active individuals and older adults with an increased risk of falling are most frequently affected.

Symptoms

Common signs and symptoms of a Weber fracture include:

Severe pain at the outer ankle, especially when bearing weight
Swelling and bruising (hematoma) around the ankle joint
Tenderness on palpation of the fibula and lateral malleolus
Restricted range of motion of the ankle
Difficulty or inability to walk in more severe cases

Diagnosis

The diagnosis of a Weber fracture is established through:

Physical examination: Palpation of the ankle and fibula, assessment of syndesmotic stability using stress tests
X-ray imaging: Standard views (anteroposterior and lateral) plus a mortise view (20-degree internal rotation). This allows classification into Weber type A, B, or C.
MRI or CT scan: Used in complex cases, unclear findings, or suspected ligament injuries

Treatment

Conservative Management

Weber A fractures and stable Weber B fractures are frequently treated without surgery:

Immobilisation in a below-knee cast or walking boot for 4–6 weeks
Partial weight-bearing with crutches during the initial phase
Ice application and elevation of the limb to reduce swelling
Physiotherapy to restore strength and joint stability

Surgical Management

Unstable Weber B fractures and nearly all Weber C fractures require surgery:

Open reduction and internal fixation (ORIF): The fracture is stabilised using plates and screws (typically a one-third tubular plate along the fibula)
Syndesmotic screw: When the syndesmosis is disrupted, a temporary positioning screw is inserted and usually removed after 6–12 weeks
Postoperative rehabilitation: Physiotherapy and gradual return to weight-bearing

Prognosis and Recovery

With appropriate treatment, the prognosis for a Weber fracture is generally favourable. Full recovery typically takes 6–12 weeks depending on the fracture type and treatment approach. Consistent physiotherapy is essential to restore full ankle function and prevent long-term complications such as post-traumatic ankle osteoarthritis. Inadequate stabilisation or premature weight-bearing may increase the risk of complications.

References

Dettwyler, M. et al.: Weber Fracture. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing (2024). PMID: 31869173
Rammelt, S. & Zwipp, H.: Ankle fractures. Der Chirurg, 84(12), 1059–1076 (2013). DOI: 10.1007/s00104-013-2595-0
Stufkens, S.A.S. et al.: Long-term outcome after pronation-external rotation type-IV fibula fractures. Journal of Bone and Joint Surgery (British Volume), 93-B(8), 1096–1102 (2011). DOI: 10.1302/0301-620X.93B8.26244

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