Syndesmotic Ligament – Function, Injury and Treatment
The syndesmotic ligament connects the tibia and fibula just above the ankle joint. Injuries to this structure are among the most common ankle injuries in sports.
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The syndesmotic ligament connects the tibia and fibula just above the ankle joint. Injuries to this structure are among the most common ankle injuries in sports.
What Is the Syndesmotic Ligament?
The syndesmotic ligament is a strong fibrous complex that connects the lower ends of the tibia (shinbone) and fibula (calf bone) just above the ankle joint. This connection is called the syndesmosis – a tightly bound, minimally mobile joint that is essential for ankle stability. The ligament complex includes primarily the anterior and posterior tibiofibular ligaments and the interosseous tibiofibular ligament.
Function
The primary role of the syndesmotic ligament is to hold together the ankle mortise – the socket formed by the tibia and fibula that grips the talus (ankle bone) like a clamp. This structure ensures stable and even force transmission during walking, running, and jumping. Without an intact syndesmotic ligament, the ankle mortise would widen, severely disrupting joint mechanics.
Causes of Syndesmotic Injury
Syndesmotic ligament injuries typically occur as a result of:
- Forceful outward rotation (external rotation) of the foot, common in skiing and contact sports
- Severe twisting of the ankle, either inward (inversion) or outward (eversion)
- Falls from height with impact on the foot
- Direct trauma to the ankle
These injuries are often called high ankle sprains because the pain is located above the ankle joint – distinguishing them from the more common lateral ankle sprain.
Symptoms
Typical signs of a syndesmotic injury include:
- Pain above the ankle, between the tibia and fibula
- Swelling and tenderness over the front of the ankle joint
- Increased pain with external rotation of the foot
- A feeling of instability when bearing weight
- Difficulty or pain when walking
Diagnosis
Diagnosis of a syndesmotic injury involves both clinical examination and imaging studies:
- Physical examination: Specific tests such as the squeeze test (compression of the tibia and fibula) or the external rotation stress test indicate syndesmotic involvement.
- X-ray: Used to rule out fractures and assess the gap between the tibia and fibula.
- MRI (Magnetic Resonance Imaging): The gold standard for accurately evaluating the extent of ligament damage and associated injuries.
- Ultrasound: Can be used as a supplementary tool for assessing ligament structures.
Treatment
Conservative Treatment
Mild to moderate syndesmotic injuries are generally managed without surgery:
- Immobilization of the ankle with a brace or cast for several weeks
- Ice application and elevation to reduce swelling
- Pain management with anti-inflammatory medications (e.g., ibuprofen)
- Physical therapy to restore strength, coordination, and range of motion
Surgical Treatment
Complete ligament rupture or instability of the ankle mortise often requires surgical intervention. The syndesmosis is stabilized using specialized implants such as positioning screws or flexible suture-button systems (e.g., TightRope), restoring the correct alignment of the tibia and fibula. Surgery is followed by a structured rehabilitation program lasting several weeks to months.
Recovery and Prognosis
Syndesmotic injuries generally take longer to heal than classic lateral ankle sprains. Full recovery can take anywhere from six weeks to several months depending on the severity of the injury. If left untreated or improperly managed, these injuries can lead to chronic ankle instability and early-onset joint degeneration (osteoarthritis).
References
- Hagemeijer NC, Chang SH, Abdelaziz ME et al. - Range of Syndesmotic Instability in Systematic Destabilization of the Ankle. Journal of Bone and Joint Surgery, 2019.
- Schepers T - Acute distal tibiofibular syndesmosis injury: a systematic review of suture-button versus syndesmotic screw repair. International Orthopaedics, 2012.
- Williams GN, Jones MH, Amendola A - Syndesmotic Ankle Sprains in Athletes. American Journal of Sports Medicine, 2007.
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