Ankle Sprain
An ankle sprain is one of the most frequently treated musculoskeletal injuries in Singapore, affecting recreational walkers and competitive athletes alike. This page explains how an ankle sprain is graded, what the symptoms look like, how it is diagnosed and treated, and when specialist assessment is the appropriate next step.
Dr Dennis Ng Zhaowen
What Is An Ankle Sprain?
An ankle sprain is a stretch or tear of one or more ligaments surrounding the ankle joint. Ligaments are bands of fibrous tissue that connect bone to bone and hold the joint stable, so when they are overstretched, the joint loses part of its passive support.
The most commonly injured structure is the lateral ligament complex on the outer side of the ankle. It comprises three ligaments: the anterior talofibular ligament (ATFL), which is the main restraint at the front of the ankle, the calcaneofibular ligament (CFL), which runs along the outer heel, and the posterior talofibular ligament (PTFL), which sits at the back. These act as the ankle’s outer guy wires, limiting how far the foot can roll inward. According to a clinical review of acute ankle sprains, approximately 70 per cent of lateral ankle sprains involve the ATFL, often in isolation.
Because ligament injury is not visible on standard X-ray, an ankle sprain that fails to settle on schedule often needs a different kind of assessment rather than simply more rest.
What Are The Types Of Ankle Sprain?
Ankle sprains are classified in two ways: by which ligament group is injured, and by how severely the ligament is damaged.
Classification By Anatomical Location:
- Lateral ankle sprain. The inversion injury affects the outer ligament complex. This accounts for the large majority of cases, and an isolated ATFL tear is the single most frequent pattern.
- Medial (deltoid) ankle sprain. Caused by an eversion force rolling the foot outward. The deltoid ligament is strong, so isolated medial sprains are uncommon and usually indicate a higher-energy injury, sometimes accompanied by a fracture.
- Syndesmotic sprain, or high ankle sprain. This involves the ligaments binding the two lower leg bones just above the ankle joint. It typically results from external rotation or forced dorsiflexion rather than simple inversion, and represents roughly 1 to 10 per cent of ankle sprains. It is more common in collision sports and is frequently missed on initial assessment.
Classification By Severity Grade:
| Grade | Ligament Damage | Typical Clinical Picture |
| Grade I | Stretch with microscopic fibre tearing; fibres remain intact | Mild tenderness, minimal swelling, no mechanical instability, weight-bearing possible |
| Grade II | Partial tear with some fibres disrupted | Moderate pain, swelling and bruising, some difficulty weight-bearing, ligament lax but with a definite endpoint on testing |
| Grade III | Complete rupture of one or more ligaments | Significant pain and diffuse swelling, usually unable to bear weight initially, evident instability on examination |
A fourth category worth naming separately is chronic ankle instability, which is not an acute injury type but the end result of a sprain that never regained its stability.
What Causes An Ankle Sprain?
The most common mechanism is the foot rolling inward suddenly, a movement called inversion. This typically occurs during:
- A sudden change of direction in sport, such as cutting in basketball, football or badminton
- Landing awkwardly from a jump
- Stepping on an uneven surface or the edge of a kerb
- A fall or collision during contact sports such as rugby or judo
Certain factors also increase susceptibility. A review of risk factors for lateral ankle sprain and chronic instability in the Journal of Athletic Training groups these into intrinsic and extrinsic categories:
- A previous ankle sprain. Even one prior episode meaningfully raises re-injury risk, and this is the single strongest predictor.
- Weak peroneal muscles along the outer lower leg, which normally provide dynamic stabilisation.
- Poor proprioception, meaning the ankle’s ability to sense its own position in space.
- Generalised ligamentous laxity or naturally hypermobile joints.
- Extrinsic factors such as inadequate warm-up, unsupportive footwear, uneven playing surfaces, and returning to sport before rehabilitation is complete.
What Are The Symptoms Of Ankle Sprain?
Symptom severity broadly tracks the grade of injury, but presentation is not always proportionate to the damage, which is why grading is confirmed clinically rather than by how bad it feels.
- Pain
Usually immediate, concentrated around the ankle joint, and worse with movement or weight-bearing. Some patients describe hearing or feeling a pop at the moment of injury. - Swelling
Develops quickly due to inflammation and fluid accumulation. Swelling localised over the outer ankle suggests a lateral sprain, while diffuse swelling or swelling above the joint line raises the possibility of a fracture or a high ankle sprain. - Bruising
Discolouration appears around the ankle and foot within hours to days as blood leaks from damaged tissue into the surrounding area. - Tenderness
The area over the injured ligaments is painful to touch. Tenderness directly over the bony points of the ankle or foot is treated differently, as it may indicate a fracture. - Reduced Range of Motion
Stiffness makes walking, stair descent and squatting difficult. - Instability or Giving Way
A sense that the ankle is unreliable or wobbles under load. This is more typical of higher-grade injuries and of recurrent sprains.
Symptoms that warrant more concern include an inability to take four steps, numbness or tingling in the foot, visible deformity, or rapidly spreading bruising.
When To See An Orthopaedic Specialist?
Seek same-day urgent care if:
- You cannot put any weight on the injured ankle at all
- There is visible deformity around the ankle or foot
- You feel numbness or tingling in the foot
- Bruising is spreading rapidly, and swelling is severe
Arrange a specialist appointment within the first week if:
- Swelling is worsening or has not begun improving after 48 hours
- Pain has not improved meaningfully within five days
- The ankle feels like it is giving way when you walk
- You heard or felt a pop or snap at the time of injury
- This is a repeat sprain on the same ankle
If the injury occurred during training or competition, a sports injury specialist in Singapore can build your return-to-sport plan around your specific activity demands rather than a generic timeline.
How Do You Diagnose An Ankle Sprain?
Diagnosis combines history, physical examination and, where indicated, imaging. The aim is to establish the grade, exclude a fracture, and identify associated injuries that change the treatment plan.
Clinical History
The mechanism of injury points to the structures involved. Inversion suggests lateral ligament damage, eversion raises concern for the deltoid ligament, and a rotational or dorsiflexion mechanism suggests a syndesmotic injury. Weight-bearing status immediately after the injury and any history of previous sprains are both recorded.
Physical Examination
The specialist palpates the bony landmarks and each ligament group in turn, then assesses range of motion and peroneal strength. Specific stress tests assess ligament integrity. The anterior drawer test assesses the ATFL, the talar tilt test assesses the CFL, and the squeeze and external rotation stress tests assess the syndesmosis. Acute pain and muscle guarding can limit the reliability of these tests in the first few days, so re-examination after swelling settles is sometimes necessary.
X-ray
The decision to X-ray is guided by the Ottawa Ankle Rules, a validated clinical decision tool. A systematic review found the rules to be close to 100 per cent sensitive for excluding clinically significant fractures, while reducing unnecessary radiographs by roughly a third. Importantly, a normal X-ray rules out a broken bone but says nothing about the ligaments.
MRI
MRI is the most sensitive modality for soft tissue and is generally indicated when pain persists beyond about six weeks despite appropriate treatment, when a high ankle sprain is suspected, or when there is concern about an osteochondral lesion. It can reveal cartilage injuries on the joint surface and peroneal tendon damage that standard imaging misses entirely.
Ultrasound
Offers a dynamic, real-time assessment of ligament integrity and peroneal tendon subluxation. Accuracy depends heavily on operator experience, and it is often used to complement rather than replace examination.
Where imaging suggests damage inside the joint, ankle arthroscopy allows direct visualisation of the joint surface and can address loose fragments or impinging scar tissue at the same sitting as any ligament work.
How Do You Treat An Ankle Sprain?
Treatment depends on the grade of injury and on whether instability has become chronic. The reassuring reality for most patients is that most ankle sprains, including virtually all Grade I and II injuries and most Grade III injuries, are managed without surgery.
Non-Surgical Treatment
Non-surgical care follows a structured progression rather than a fixed protocol.
- Protection and relative rest (days 1 to 3). Protect the ankle from further injury and avoid activities that provoke pain. For a Grade III injury, a short period of immobilisation in a walking boot may be appropriate, but clinical guidelines advise against casting beyond four weeks, as prolonged immobilisation causes stiffness and weakness without improving long-term outcomes.
- Ice, compression and elevation. Cold therapy combined with an elastic bandage or sleeve limits swelling and pain in the acute phase. Elevating the ankle above heart level is most useful in the first 48 hours.
- Early controlled motion. Gentle range-of-motion work begins once initial pain and swelling start to subside, usually within three to seven days. Functional treatment consistently outperforms extended immobilisation.
- Bracing and support. A semi-rigid brace, air stirrup or taping protects the healing ligament while permitting the up-and-down motion the ankle needs. Functional bracing during rehabilitation and high-risk activity is preferred to prolonged casting.
- Physiotherapy and proprioceptive retraining. Rehabilitation progresses from pain and swelling control, to peroneal and calf strengthening, to balance work, agility drills and sport-specific movement. Proprioceptive rehabilitation is not an optional add-on. Skipping it is one of the more common reasons patients experience recurrent instability after what appeared to be a straightforward sprain.
- Pain medication. Short courses of non-steroidal anti-inflammatory medication or simple analgesia help patients mobilise earlier. These are generally needed for a few days rather than weeks.
Surgical Treatment
Surgical management is generally considered when:
- Recurrent instability
- High grade or complete tears
- Giving-way episodes persist despite three to six months of structured rehabilitation
- There is meaningful functional limitation in sport or daily activity
- Imaging confirms ligament insufficiency where the tissue is too damaged to heal adequately on its own
- A syndesmotic injury has produced separation of the tibia and fibula on imaging
- A displaced avulsion fragment or an osteochondral fragment is present within the joint
The most commonly performed procedure for chronic lateral instability is the Broström-Gould ankle ligament repair, which tightens and reattaches the damaged lateral ligaments and reinforces the repair using the inferior extensor retinaculum. Published clinical studies report favourable outcomes in appropriately selected patients, though individual surgical results vary. Where native ligament tissue quality is poor, or a previous repair has failed, reconstruction using a tendon graft may be considered instead.
It is worth being clear about what surgery can and cannot do. The procedure aims to restore mechanical stability. It does not, on its own, restore proprioception or strength, both of which depend on the post-operative rehabilitation programme. Outcomes are closely linked to how consistently that programme is followed, and both surgical and non-surgical pathways should be discussed against your specific goals, activity level and injury history.
What Are The Complications Of An Untreated Ankle Sprain?
An inadequately rehabilitated ankle sprain can lead to chronic ankle instability, where the ligaments remain lax, and the ankle repeatedly gives way during ordinary activity. This is not simply a weak ankle. It is a distinct clinical problem with its own progression, and it is common. Research summarised in the review of ankle sprain and chronic ankle instability epidemiology indicates that a substantial proportion of patients, up to around 40 per cent, report persistent symptoms after an ankle sprain.
Recognised complications include:
- Chronic ankle instability. Mechanical laxity combines with impaired proprioception, so the ankle loses its ability to react quickly to uneven ground.
- Recurrent sprains. Each episode adds cumulative damage to the joint surfaces.
- Osteochondral lesions. Injury to the cartilage of the talus, which often accounts for pain that persists well beyond the expected healing period.
- Peroneal tendon injury. Damage to the tendons that dynamically stabilise the outer ankle.
- Post-traumatic ankle arthritis. Uncommon after a single sprain, but repeated injury and altered joint mechanics can produce degenerative change over time.
- Nerve irritation. Injury to the superficial peroneal nerve can cause sensory disturbance or ongoing discomfort.
- Persistent swelling and restricted motion. Related to incomplete resolution of the original soft tissue injury.
The functional and emotional burden is real, and patients frequently describe anxiety about re-injury during ordinary activities such as walking on grass or descending stairs, frustration after treatment rounds that did not resolve the problem, and the loss of activities they value. If this describes your experience, it is a recognised clinical pattern, not something unusual.
How Do You Prevent An Ankle Sprain?
Prevention centres on restoring what the injury took away and then protecting it.
- Complete the rehabilitation programme. This is widely regarded as one of the most effective ways to reduce the risk of another sprain. A sprain that is rehabilitated only until the pain stops may leave a proprioceptive deficit, increasing the risk of subsequent sprains.
- Proprioceptive and balance training. Single-leg stance work, wobble board training and progressive agility drills retrain neuromuscular control.
- Peroneal and calf strengthening. Resistance band eversion work, heel and toe raises, and calf strengthening restore dynamic support to the outer ankle.
- Bracing or taping during high-risk activity. Functional bracing has good evidence for both first-time and repeat injury prevention in athletes, and is often recommended during high-risk sport for six to twelve months after a sprain.
- Appropriate footwear. Shoes suited to the surface and activity, with adequate heel counter support.
- Warm-up and gradual progression. Prepare the calves, Achilles tendon and ankles before activity, and increase training volume or intensity gradually rather than in jumps.
Conclusion
An ankle sprain is among the most common injuries treated in Singapore, and also among the most frequently undertreated. Whether you are dealing with a first-time injury or a pattern of recurrent instability that has not resolved, a structured assessment can establish the grade, identify any associated cartilage or tendon injury, and set out a clear path back to full activity. The consistent message across the clinical evidence is that complete rehabilitation, particularly the proprioceptive phase, does more to determine the long-term outcome of an ankle sprain than the severity of the initial injury.
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Frequently Asked Questions (FAQs)
Can I walk on a sprained ankle?
For a mild Grade I sprain, walking with some discomfort is generally acceptable, and early weight-bearing as tolerated is encouraged. If you cannot bear weight without significant pain, or cannot take four steps, seek medical assessment rather than pushing through, as this may indicate a fracture or a higher-grade injury.
How do I know if my ankle sprain is serious?
Warning signs include inability to bear weight, rapid or severe swelling, visible deformity, and numbness in the foot. Pain that has not improved within five days, or a sense that the ankle is giving way, also warrants assessment. Clinical examination combined with imaging determines the grade and identifies associated injuries.
What is the difference between a sprain and a fracture?
A sprain involves ligament damage, while a fracture is a break in the bone. Both cause pain, swelling and difficulty walking, which is why the two can be difficult to distinguish on symptoms alone. The Ottawa Ankle Rules help clinicians decide when an X-ray is warranted.
Can ankle sprains heal on their own without treatment?
Grade I sprains often settle with rest and basic self-care. However, without structured rehabilitation, even a mild sprain can leave residual weakness and impaired proprioception. Grade II and III sprains consistently benefit from guided physiotherapy to support complete recovery.
How long does it take to recover from an ankle sprain?
Grade I sprains typically resolve within 1 to 4 weeks, Grade II sprains within 3 to 6 weeks, and Grade III sprains within 6 weeks to several months. Where surgery is required for chronic instability, return to sport is usually around three to four months post-operatively. Return to sport is guided by functional testing rather than calendar dates.
How can I prevent ankle sprains from recurring?
Completing a full rehabilitation programme after any sprain, including the proprioceptive phase, is the most effective prevention strategy. Appropriate footwear, ankle bracing during high-risk activity, and maintaining peroneal muscle strength all reduce re-injury risk.
Do I need surgery for an ankle sprain?
Most patients do not. Surgery is generally considered only when there is recurrent instability, high-grade or complete tears, giving-way episodes persist after three to six months of structured rehabilitation, when imaging confirms ligament insufficiency, or when there is a syndesmotic injury with separation of the leg bones. Acute surgical repair is not recommended for a first-time sprain.