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Ankle sprain

What is an Ankle Sprain?

An ankle sprain is one of the most common musculoskeletal ankle injuries. It occures when the ligaments that support the ankle are overstretched or torn, usually due to a sudden twist, roll, or impact.

The lateral ligaments on the outside of the ankle are most commonly affected, particularly the anterior talofibular ligament (ATFL), which is vulnerable when the foot turns inward (inversion). Ankle sprains can happen during sport, everyday activities such as walking on uneven ground, or slipping on wet surfaces. Severity can vary from mild stretching to complete rupture.

Classification of Ankle Sprains

Ankle sprains are typically graded based on severity:

Grade I (mild)
- Microscopic tearing of ligament fibres
- Minimal swelling and bruising
- No joint instability
- Mild pain and stiffness
Grade II (moderate)
- Partial ligament tear
- Noticeable swelling and bruising
- Difficulty bearing weight
- Some joint laxity or instability
Grade III (severe)
- Complete ligament rupture
- Significant swelling and bruising
- Marked pain and instability
- Often requires longer recovery and specialist management

Symptoms and Diagnosis

Common symptoms include:

Pain around the ankle (especially on the outer side)
Swelling and bruising
Difficulty walking or weight-bearing
A “pop” or tearing sensation at the time of injury (in more severe cases)

Accurate diagnosis is essential to guide treatment. Most sprains can be diagnosed clinically, but imaging may be required to rule out associated injuries:

X-rays – to exclude fractures, especially if weight-bearing is difficult
MRI or ultrasound – in persistent, recurrent, or severe cases to assess ligament damage or associated cartilage/tendon injury

Poorly managed ankle sprains can lead to long-term problems such as chronic instability, recurrent sprains, and early joint wear, making early assessment and treatment important.

Treatment for Ankle sprain

Treatment depends on severity but always begins with immediate first aid using the POLICE principle:

Protection – avoid further injury
Optimal Loading – early, controlled movement as tolerated
Ice – reduce pain and swelling
Compression – limit swelling
Elevation – assist fluid drainage

In the first 48–72 hours, reducing weight-bearing and using ice can help control symptoms.

Conservative Management

Most Grade I and II sprains are treated non-surgically with:

Short period of relative rest or immobilisation
Progressive physiotherapy rehabilitation
Restoring range of motion and joint mobility
Strengthening of ankle and calf muscles
Balance and proprioception training
Gradual return to sport or activity

Rehabilitation is essential to restore function and reduce the risk of recurrence. Exercises such as single-leg balance work, resistance band strengthening, and dynamic control drills help retrain the ankle and improve stability. Bracing or supportive footwear may be used during return to sport, particularly in higher-risk activities.

Further Treatment Options

In more severe Grade III injuries or cases of persistent instability, further intervention may be required. This may include:

Advanced imaging to assess ligament integrity
Specialist review for recurrent instability
Minimally invasive (arthroscopic) ligament repair or reconstruction when needed

Modern surgical techniques can effectively restore stability and function, particularly when combined with a structured rehabilitation programme. With appropriate management, most patients achieve excellent recovery and are able to return to full activity and sport.