Tibiofibular Syndesmosis Tear (High Ankle Sprain). A serious ankle injury that is often missed and slows down recovery

What Is the Tibiofibular Syndesmosis?

The tibiofibular syndesmosis is a strong connection between the two lower-leg bones:

• Tibia (shin bone)

• Fibula (outer lower-leg bone)

It is formed mainly by two ligaments (front and back) that hold these bones together just above the ankle.This connection creates a stable socket for the ankle bone (talus).

Although the syndesmosis is very stiff, it still allows small movements, which are essential for normal walking and running.

Why Is This Structure So Important?

The ankle bone (talus) is wider in the front and narrower in the back.

• When the foot points downward (plantarflexion), the narrower part of the talus sits in the ankle joint.→ This allows more movement but less stability.

• When the foot bends upward (dorsiflexion), the wider part of the talus fills the joint.→ This creates more stability and allows higher load.

This natural mechanism is crucial for a normal walking pattern—but it also explains why injuries happen.

How Does a Syndesmosis Tear Happen?

A syndesmosis injury usually occurs when:

• The foot is pointed downward

• A sudden twist, pull, or force is applied

This can overstretch or tear the ligaments that hold the tibia and fibula together.

Common injury situations include:

• Running or sprinting

• Stepping on uneven ground

• Sudden change of direction

• Incorrect landing after a jump

⚠️ Syndesmosis injuries occur in about 10% of ankle sprains, but they are often missed, which can significantly delay recovery.

Symptoms – How It Feels

In early stages, symptoms may include:

• Pain at the end range of ankle movement

• Pain when putting weight on the foot

• Tenderness over the front of the ankle

• Swelling and warmth

With a full tear, patients may experience:

• A feeling of ankle instability

• Difficulty trusting the ankle during walking or sports

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Diagnosis

A proper diagnosis requires a detailed clinical examination.

Physiotherapists and doctors may use:

• Palpation of the injured ligaments

• Testing the movement between the tibia and fibula

• The squeeze test (pain at the ankle when the leg is compressed higher up)

• The Cotton test (checking ankle bone movement)

Both sides should always be compared.

To rule out serious injuries, such as a Maisonneuve fracture, the upper fibula is also examined.

Imaging:

• Weight-bearing X-ray can show increased space between the tibia and fibula

• MRI or bone scintigraphy may be used to confirm the diagnosis

Conservative (Non-Surgical) Treatment

In most cases, physiotherapy is the first and most important treatment.

Surgery is considered only when:

• There is major instability

• The syndesmosis is completely torn

Conservative treatment includes:

• Manual therapy targeting the syndesmosis

• Soft tissue therapy (deep tissue massage, fascial techniques)

• Supportive methods such as taping, flossing, dry needling, or IASTM

• Progressive rehabilitation exercises

Rehabilitation focuses on:

• Restoring ankle stability

• Improving balance and proprioception

• Gradually increasing load and movement complexity

If conservative treatment does not bring sufficient improvement, surgical options may be discussed.

Surgical Treatment

If surgery is required, the surgeon may choose:

• Syndesmosis screw fixation (rigid stabilization)

• TightRope system (allows small natural movement between bones)

After surgery, patients usually need:

• Temporary immobilization in a walking boot

• Early controlled weight-bearing

• Blood-clot prevention exercises

• Strengthening of the entire lower limb

• Full post-operative physiotherapy

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Why This Injury Is Often Missed

A syndesmosis tear is frequently mistaken for a simple ankle sprain.If pain and instability last longer than expected, this injury should always be considered.

When to See a Physiotherapist

You should seek professional assessment if:

• An ankle sprain is healing very slowly

• You feel instability or pain with weight-bearing

• Pain is located higher than a typical ankle sprain

Early diagnosis leads to faster and safer recovery.

References

1. Brotzman S.B., Wilk K.E. Orthopaedic Rehabilitation. Elsevier, 2009.

2. Bartoníček J. Anatomy of the tibiofibular syndesmosis. Surgical and Radiologic Anatomy, 2003.

3. Oae K. et al. MR imaging of syndesmosis injuries. Radiology, 2003.

4. Zwipp H. et al. Ligament injuries of the ankle. Clinics in Pediatric Medicine and Surgery, 2002.

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