What it is

Lateral ligament injuries are among the most common sports-related injuries seen by physiotherapists. They are thought to be suffered by men and women at the same rates.

A lateral ankle sprain is an overstretch or tear of the ligaments on the outside of the ankle, most often the anterior talofibular ligament and, with greater force, the calcaneofibular ligament. These are referred to as “inversion sprains”

The usual mechanism is the foot rolling in while the ankle is pointed down due to a sudden twist or impact. Other causes include injury from activities such as walking on uneven ground or sudden changes in direction. Pain, discolouration from bruising, and swelling appear around the outside of the ankle bone, and weight-bearing becomes uncomfortable.

People recognise the sequence: a sharp twist, immediate pain, swelling over hours, and difficulty pushing off or changing direction. Mild sprains typically resolve quickly; however, persistent stiffness and poor balance can lead to recurring symptoms.

Left unmanaged, a first sprain can set the stage for repeated episodes and a sense of giving way. Inadequate rehabilitation can lead to residual symptoms after a lateral ankle sprain, affecting 55% to 72% of patients at 6 weeks to 18 months. Ligaments and the surrounding muscles respond to a structured plan. Early protection, followed by progressive strength and balance training initiated at Spinal and Sports Care, helps restore stability and confidence.

What happens when it occurs

The ligament fibres on the lateral side are stretched beyond their capacity. Small tears trigger swelling, bleeding and pain that inhibit the peroneal muscles, which generally protect the joint. Early movement in a protected range, compression, and balance work shorten recovery. Care should also be taken to avoid missing less common causes of ankle pain, such as small fractures around the ankle and foot, and straining or rupture of the muscles surrounding the ankle.

Common causes and risk factors

  • Sudden change of direction, landing from a jump
  • Landing on uneven surfaces or on another player’s foot
  • Prior ankle sprain, reduced balance, weak evertor muscles
  • Cavus or supinated foot posture, worn or unstable footwear

Who is most affected

Field and court athletes, runners on uneven terrain, and anyone returning to sports after a time off.

Typical symptoms

  • Pain and tenderness on the outside of the ankle / behind the fibula
  • Swelling and bruising
  • Difficulty in bearing weight
  • Pain with push-off, cutting, and landing
  • A feeling of instability or weakness, especially on uneven ground
  • An audible “pop” or click heard at the time of injury

When to seek care

While some ankle sprains may be mild, a medical evaluation is essential to confirm the diagnosis, rule out other potential injuries such as fractures, and determine the appropriate treatment, particularly for more severe injuries.

Seek assessment if you cannot take four pain-limited steps, have bony tenderness around the ankle or base of the fifth metatarsal (outside of your foot), or if swelling and pain do not improve over the first week. At Spinal and Sports Care, we believe that there is no such thing as a “simple ankle sprain”, so early diagnosis and intervention are essential.

How we diagnose

History and examination, including key tests such as the anterior drawer test and talar tilt test. We screen for associated injury to the peroneal tendons, base of the fifth metatarsal, and osteochondral lesions. Imaging is used when a fracture is suspected or when instability persists, and clinicians are guided by the “Ottawa rules”.

The "Ottawa rules" are a universally accepted clinical decision-making tool used by healthcare professionals to determine if a patient with ankle or foot pain requires an X-ray to diagnose a bone fracture. The rules help avoid unnecessary imaging by providing specific criteria for bony tenderness and inability to bear weight, which can indicate a fracture and thus warrant an X-ray.

Sprains are Categorised into three grades:

  • Grade 1 (Mild): Minimal stretching and slight tearing of ligament fibres, with little swelling or bruising and no instability.
  • Grade 2 (Moderate): More significant tearing, but not a complete rupture, leading to moderate pain, swelling, and instability.
  • Grade 3 (Severe): A complete rupture of the ligament, causing severe pain, swelling, bruising, and significant ankle instability

Management

  • Protection and relative rest, compression, elevation in the first 48 to 72 hours. Ice can be used for analgesic benefit.
  • Early range within pain limits, then progressive strength for the peroneals and calf
  • Rehabilitation: Balance and perturbation training to restore joint position sense
  • Functional bracing or taping during the early return phase
  • Surgery is rarely required unless instability persists despite structured rehabilitation

Rehabilitation milestones

Phase 1, days 0 to 5: control pain and swelling, protected weight bearing, gentle range.

Phase 2, weeks 1 to 3: progressive banded eversion, heel raises, balance in single-leg stance.

Phase 3, weeks 3 to 6: hopping drills, change of direction, acceleration and deceleration tasks.

Phase 4, weeks 6 to 10: unrestricted training with brace or tape as needed, then match play.

Readiness to progress

  • Next-morning pain no higher than 2 out of 10
  • Eversion strength and single-leg heel raise endurance are within 90% of the strength and endurance of the other side.
  • Balance targets met and pain-free lateral hop and figure-of-eight runs

Prevention

  • Maintain peroneal strength
  • Complete a balance program after every sprain
  • Use a lace-up brace for the first games back
  • Check landing and cutting technique

Australia snapshot

  • Ankle sprains are a common occurrence in netball and are a leading cause of injury in football codes.
  • Without structured rehabilitation, about one quarter develop persistent symptoms or instability.
  • Community and elite netball, rugby league, rugby union, and football supply most lateral sprains

Latest insights

Early, protected movement beats prolonged immobilisation for grade I to II sprains.

Balance and eversion strength reduce recurrence more than rest.

Bracing during the return to play for 3-6 months lowers the risk of re-injury while strength and control catch up.

Frequently Asked Questions

Timeframes depend on the grade and your starting capacity. Mild injuries often settle within weeks when loading is matched to tolerance. Moderate injuries take longer to recover from, as strength and control are rebuilt. Severe injuries or those with instability need a longer block and closer supervision. Progress is criteria-based and does rely on the patient attending treatment and remaining compliant with their rehabilitation plan.

Yes, if pain during activity stays at or below 3 out of 10 and does not worsen the next morning. Reduce volume and intensity, maintain a tidy technique, and avoid movements that exacerbate symptoms.

Imaging is based on a universal criterion, known as the “Ottawa rules’, which guide a clinician’s decision-making for imaging. Imaging helps when red flags are present, progress stalls after two weeks, or instability or a tear is suspected. Your clinician will advise on whether an X-ray, ultrasound, or MRI is most suitable for your condition based on your presentation.

Use a brace or tape during the early return or on uneven ground. Remove it for controlled strength and balance work so that muscles can relearn their job. A period of 3 months is usually indicated by research to protect the ankle ligaments during their initial phase of healing and ligament remodelling after injury.

Ice helps early when swelling and pain dominate. Heat helps later when stiffness is the main issue. Both have their advantages and disadvantages, with new research indicating that cold may actually slow down the healing response. Speak to your clinician for guidance.

When next‑morning pain is 2 out of 10 or less, strength is within 90% of the other side, and you pass the functional test for this condition, such as single‑leg hops, figure‑of‑eight runs, or step‑downs. This depends on the severity or grade of the injury and the patient’s compliance in completing their rehabilitation.

Cut the next session’s volume by 20 to 30 per cent, keep strength work, and retest the following day. Progress again when baseline settles. Your clinician will guide you. 

They can unload sensitive tissue early. Keep them while strength and control improve, then review fit and need. These are typically not required.

Most people continue working on tasks and making standing adjustments. Drive when you can load and move the ankle safely and brake firmly without pain. Your clinician will guide you.