Do I need an X-ray for my ankle sprain?

Not always. The Ottawa Ankle Rules determine who needs X-ray and reliably identify clinically significant fractures with about 99% sensitivity. An ankle X-ray is needed if there is bone tenderness at the posterior edge or tip of either malleolus, or if you cannot take four steps immediately after the injury and in the clinic. A foot X-ray is needed if there is tenderness at the base of the fifth metatarsal or over the navicular bone, or the same inability to weight-bear. If none of these apply, X-ray is not necessary and clinical management can begin right away. These rules have been validated across thousands of patients and substantially reduce unnecessary imaging.

What is the POLICE protocol and how is it different from RICE?

RICE (Rest, Ice, Compression, Elevation) is the older approach. POLICE replaces Rest with Protection and Optimal Loading — meaning early, pain-guided movement and gentle weight-bearing from day one, rather than complete rest. The evidence shows that early mobilisation with functional support (a brace or strapping) produces faster return to function than prolonged immobilisation in a plaster cast. Protection means using a brace, not avoiding all movement. Ice is still recommended for symptomatic relief in the first 48–72 hours. Compression and elevation remain useful for managing swelling. The overall message: keep moving within a protected, pain-guided range from day one.

How long before I can return to sport?

Return to sport depends on the grade of injury. Grade I sprains (ligament stretched but intact) typically allow return in 1–2 weeks with a brace. Grade II (partial tear) usually requires 2–6 weeks of rehabilitation. Grade III (complete rupture) typically takes 4–12 weeks, with gradual progression from basic mobility to sport-specific training. Criteria for return include: pain-free walking and jogging; single-leg hop performance at least 90% of the other side; balanced single-leg stance; and completion of sport-specific drills. A brace should be worn for all sport for at least 6 months after a significant sprain to prevent re-injury.

What is chronic ankle instability and how is it prevented?

Chronic ankle instability is the feeling that the ankle gives way repeatedly, usually during walking on uneven ground or changing direction. It affects roughly 30% of people who sprain their ankle without completing a proper rehabilitation programme. The underlying problem is proprioceptive deficit — the mechanoreceptors in the damaged ligament no longer send accurate position signals to the brain, so the ankle reacts slowly to instability. Rehabilitation with balance and proprioception exercises (single-leg stance, wobble board, sport-specific agility work) directly addresses this deficit. Without rehabilitation, re-injury is common. With it, the ankle can function well even after a grade III sprain.

What injuries can look like an ankle sprain but are actually more serious?

Several injuries present with ankle pain after inversion and are missed if only an ankle X-ray is reviewed. The most important: a Maisonneuve fracture (spiral break of the proximal fibula from a rotational mechanism — the ankle X-ray appears normal, but proximal fibula tenderness reveals the injury); a fifth metatarsal base avulsion (Jones fracture, tender just distal to the ankle); an osteochondral lesion of the talus (persistent pain without swelling weeks later); a syndesmosis or high ankle sprain (worse with rotation than inversion, slower recovery); peroneal tendon dislocation (snapping sensation along the outer ankle); and Achilles tendon rupture (palpable gap in the tendon, positive Thompson test). See your GP if pain persists beyond 6 weeks.

Ankle sprain — lateral ligament complex

Ankle sprain: Ottawa rules, POLICE protocol, and getting back to sport

By Dr HB Lo, FACRRM Reviewed 10 June 2026 9 min read

Ankle sprain — most commonly an inversion injury to the lateral ligament complex — is the most common acute musculoskeletal injury in Australian general practice. Severity is graded I to III based on whether the ligament is stretched, partially torn, or completely ruptured.

Apply the Ottawa Ankle Rules first to determine whether X-ray is needed, then use POLICE (Protection, Optimal Loading, Ice, Compression, Elevation) — early protected movement outperforms prolonged rest.

Proprioception and balance rehabilitation is the most important preventive step: without it, ~30% develop chronic instability or recurrent sprains.

What ankle sprain actually is

Ankle sprain is injury to the ligamentous structures of the ankle, most commonly the lateral ligament complex following an inversion mechanism — the foot rolls inward and the outer ankle is stressed. The anterior talofibular ligament (ATFL) is the weakest and tears first; with greater force, the calcaneofibular ligament (CFL) and then the posterior talofibular ligament (PTFL) are involved.

It is the most common acute musculoskeletal injury in Australian general practice and sport. Netball, basketball, AFL, football, and soccer all carry high ankle sprain rates. Prior ankle sprain is the strongest single risk factor for re-injury — approximately 30% of people who sprain an ankle without completing rehabilitation develop chronic instability.

The JOSPT 2021 Clinical Practice Guideline on Ankle Stability and Movement Coordination Impairments provides the current evidence basis for management. Two key messages dominate: the Ottawa Ankle Rules reliably triage who needs X-ray (sparing many unnecessary scans), and early mobilisation with functional support — not plaster immobilisation — produces better outcomes.

Medial ankle sprain (deltoid ligament, eversion mechanism) accounts for approximately 5% of ankle sprains and is frequently associated with an avulsion fracture; plain X-ray is important. High ankle sprain (syndesmosis, external rotation mechanism) accounts for approximately 10% and has a different, slower recovery trajectory.

A. Core clinical — the AU general-practice framework

Assessing severity — grades I, II, III

Grade	Pathology	Clinical features	Recovery
I	Microscopic tear / ligament stretch	Mild swelling; minimal pain; weight-bearing maintained; no instability	1–2 weeks
II	Partial tear	Moderate swelling; ecchymosis; difficulty weight-bearing; mild instability	2–6 weeks
III	Complete rupture	Severe swelling; ecchymosis; unable to weight-bear; positive anterior drawer or talar tilt	4–12 weeks

Clinically, grade III is often underestimated acutely because severe muscle guarding limits examination accuracy in the first 24–72 hours.

History

Establish the mechanism: inversion with plantarflexion (typical lateral ligament complex); eversion (medial, suspect fracture); rotational force (syndesmosis — high ankle sprain, worse with rotating the foot rather than inverting it). Ask whether the patient weight-bore immediately after the injury. A pop or tear sensation suggests grade III. Enquire about prior ankle sprains on the same side — prior injury is the dominant risk factor for current injury.

Examination

Inspect for location of swelling (anterior talofibular region versus proximal fibula versus base of fifth metatarsal), ecchymosis, and deformity. Palpate systematically: posterior edges and tips of both malleoli; base of the fifth metatarsal (avulsion fracture); navicular; proximal fibula (Maisonneuve fracture if high-energy mechanism or rotational component); Achilles tendon (palpable gap = rupture; positive Thompson calf-squeeze test). Assess active and passive range of motion, and observe weight-bearing in clinic.

Special tests: anterior drawer (tests ATFL — anterior displacement of the talus in the mortise); talar tilt (tests CFL — inversion stress); squeeze test of the distal tibia-fibula interosseous membrane (syndesmosis); external rotation stress test (syndesmosis); Thompson test (Achilles).

Ottawa Ankle Rules — triage for imaging

The Ottawa Ankle Rules (Stiell 1992) provide a validated, high-sensitivity clinical decision rule for identifying clinically significant ankle and midfoot fractures. Sensitivity is approximately 99% for relevant fractures, reducing unnecessary X-rays by approximately 30%.

Ankle X-ray is indicated if ankle pain is present AND any of: bone tenderness at the posterior edge or tip of the lateral malleolus; bone tenderness at the posterior edge or tip of the medial malleolus; or inability to weight-bear four steps immediately after injury AND in the clinic.

Foot X-ray is indicated if midfoot pain is present AND any of: bone tenderness at the base of the fifth metatarsal; bone tenderness over the navicular; or the same inability to weight-bear criterion.

Absence of all these criteria makes clinically significant fracture very unlikely, and imaging can be deferred.

MRI is reserved for persistent symptoms at 6 weeks despite appropriate management, suspected osteochondral lesion of the talus, or equivocal plain films with ongoing clinical concern.

B. Evidence for POLICE, early mobilisation, and rehabilitation

Why POLICE replaced RICE

Classic RICE (Rest, Ice, Compression, Elevation) emphasised rest. The evidence now supports early, pain-guided weight-bearing and progressive loading as superior to complete rest. The JOSPT 2021 guideline and the eTG acute soft tissue injuries chapter both support POLICE (Protection, Optimal Loading, Ice, Compression, Elevation):

Protection: use a functional brace, not avoidance of all movement
Optimal Loading: pain-guided early movement and weight-bearing from day one
Ice: symptom relief — 15–20 minutes, up to four times daily, for the first 48–72 hours
Compression: elastic bandage or compression sleeve to manage swelling
Elevation: limb above heart level when possible, especially in the first 48 hours

The Cochrane review on early mobilisation versus immobilisation in ankle sprain (Kerkhoffs et al.) demonstrated faster return to normal function with early mobilisation and semi-rigid functional bracing compared with plaster cast — a finding now embedded in all current guidelines.

Functional support — bracing over casting

For grade II–III sprains, JOSPT 2021 recommends:

Grade II: semi-rigid brace or aircast for 4–6 weeks
Grade III: semi-rigid or rigid brace / walking boot for 1–3 weeks, transitioning to semi-rigid; physiotherapy-supervised rehabilitation

Avoid prolonged plaster cast immobilisation. Acute Grade III managed non-operatively with functional rehabilitation produces outcomes equivalent to surgery in most patients; surgery is reserved for elite athletes with associated ligamentous injuries requiring early return to competition.

Analgesia

Paracetamol first-line for pain control. NSAIDs (ibuprofen, naproxen, diclofenac) provide effective short-course analgesia — eTG and AMH support a 5–7 day course. Topical NSAIDs (diclofenac gel) are an OTC option for localised pain. There is ongoing debate about whether systemic NSAIDs might slightly impair ligament healing in the very early phase; current guideline consensus supports short-course use for meaningful pain control in acute sprains.

Proprioception training — the most important long-term step

The mechanoreceptors in the lateral ligament complex are disrupted by the tear. Without targeted rehabilitation, the ankle’s proprioceptive system remains deficient — the brain receives delayed or imprecise position signals, and the ankle reacts slowly to instability. JOSPT 2021 provides strong evidence that balance and proprioception training (single-leg stance, wobble board, BOSU balance trainer, Y-balance assessment, sport-specific agility) substantially reduces re-injury rates and the development of chronic ankle instability.

C. Rehabilitation phases and return-to-sport framework

Phase-by-phase rehabilitation

Phase 1 (days 0–7): POLICE — protected weight-bearing, ice, compression, elevation; gentle pain-free range of motion exercises starting from day 1 (ankle alphabet, circumduction, dorsi/plantarflexion).

Phase 2 (1–3 weeks): progressive range of motion; strengthening — calf raises, tibialis anterior activation, foot intrinsic exercises; proprioception begins — single-leg stance on flat surface.

Phase 3 (3–6 weeks): balance and proprioception on unstable surfaces (wobble board, BOSU); progressive resistance exercises; jogging when pain-free on flat ground; sport-specific low-intensity drills.

Phase 4 (6–12 weeks): sport-specific agility, cutting, jumping; return-to-sport criteria assessment; brace for sport.

Return-to-sport criteria

JOSPT 2021 criteria:

Pain-free walking and jogging on flat and uneven ground
Single-leg hop test performance ≥90% of the contralateral side
Y-balance test performance restored compared to contralateral side
Successful completion of sport-specific drills

A semi-rigid brace should be worn for all sport for at least 6 months after a grade II–III sprain. This is a primary prevention strategy for re-injury, supported by the Sports Medicine Australia guidelines.

Physiotherapy referral

Physiotherapy is strongly recommended for grade II–III sprains and for any patient with symptoms beyond 2 weeks. The Australian Physiotherapy Association lists practitioners. Exercise physiology input under a GP Management Plan provides structured rehabilitation for patients without easy physio access.

D. Australian operations

MBS and referral pathways

Standard GP consultation items (23, 36, 44) cover assessment and follow-up. Ankle X-ray (item 57506) and MRI ankle (items 63197/63199, specialist-requested for selected indications) are Medicare-rebatable.

The GP Chronic Condition Management Plan (items 965 and 967, replacing GPMP/TCA from 1 July 2025) funds up to 5 allied health sessions per year — physiotherapy, podiatry, and exercise physiology are all relevant for ankle rehabilitation and chronic instability. Aboriginal and Torres Strait Islander patients accessing the ATSI Health Assessment (item 715) can receive care coordination for musculoskeletal conditions.

Telehealth consultation items (91890, 91891) are available for follow-up reviews in remote and rural areas where physiotherapy access is limited.

Workers’ compensation and sport insurance

Ankle sprains occurring at work or during organised sport may be covered by workers’ compensation or sports injury insurance. Document the mechanism, grade, time off work, and treatment plan clearly. Provide a certificate of incapacity specifying expected time frame and any restrictions.

For Remote and rural settings: access to physiotherapy may be limited. The Australian Physiotherapy Association telehealth directory and exercise physiology via telehealth can support rehabilitation remotely. Sports Medicine Australia resources are freely available online.

Consumer resources

HealthDirect — Ankle sprain and Better Health Channel provide clear patient education. Sports Medicine Australia has public resources on ankle taping and bracing. The Royal Children’s Hospital Melbourne CPG is useful for paediatric presentations.

E. Special populations

Adolescents and children: the ligaments in young people are relatively stronger than the growth plates — what presents clinically as an ankle sprain in a child may be a Salter-Harris fracture of the distal fibular physis. If there is point tenderness over the physis (the growth plate is just proximal to the posterior edge of the lateral malleolus), X-ray and paediatric or orthopaedic review is warranted even if the Ottawa criteria are not met. Apply the Ottawa rules cautiously in children under 5.

Older adults: ankle sprain in older adults requires attention to falls risk and balance. The combination of proprioceptive deficit from the sprain, existing balance impairment, and potential frailty creates a falls risk. A falls risk assessment (see the falls-in-older-adults page) should accompany the ankle management. Physiotherapy rehabilitation addressing balance is particularly important. Comorbidities — peripheral neuropathy (diabetes), reduced bone density (osteoporosis), anticoagulation — all affect management.

Diabetes: peripheral neuropathy reduces proprioceptive feedback and impairs recognition of ankle instability. Healing may be slower. Monitor carefully for skin breakdown under any brace or bandage. Charcot neuroarthropathy (neuropathic joint destruction) is rare but can present with painless ankle swelling after trivial trauma in longstanding diabetes — low threshold for X-ray and specialist review.

Pregnant patients: ankle sprain is more common in pregnancy due to ligamentous laxity from relaxin. Management is the same — Ottawa rules apply, POLICE applies, avoid prolonged NSAIDs particularly in the third trimester. Physiotherapy rehabilitation within safe exercise parameters for pregnancy.

Elite and recreational athletes: return-to-sport pressure should not override rehabilitation completion. A graded rehabilitation protocol followed fully produces better long-term outcomes than premature return. Document return-to-sport timing discussions in the medical record. Sport-specific bracing (lace-up brace, semi-rigid ankle brace) for at least 6 months provides meaningful re-injury prevention as documented in JOSPT 2021.

When to escalate

Immediate ED referral: Ottawa-positive ankle with inability to weight-bear and significant mechanism; suspected Maisonneuve fracture (proximal fibula tenderness with ankle injury); suspected Achilles tendon rupture (positive Thompson test, palpable gap); suspected neurovascular compromise; severe pain disproportionate to mechanism (compartment syndrome).

Urgent or semi-urgent orthopaedic or sports medicine referral: Ottawa-positive injury with equivocal or complex imaging findings; suspected syndesmosis injury (high ankle sprain — external rotation mechanism, positive squeeze test, slow to recover); osteochondral lesion of the talus (persistent pain at 6 weeks); grade III in a young athlete requiring precise return-to-sport timeline; peroneal tendon dislocation or rupture.

Routine physiotherapy referral: all grade II–III sprains; persistent symptoms at 2 weeks; any patient at high risk of chronic instability (prior sprains, young athlete, high sport-demand).

Orthopaedic specialist: chronic ankle instability with recurrent giving-way despite 3+ months of physiotherapy-led rehabilitation; consideration of lateral ligament reconstruction (Brostrom-Gould procedure) for persistent instability.

What this article is and is not

This is general health information drawn from current Australian and international guidelines — JOSPT 2021, eTG, Sports Medicine Australia, RCH Melbourne — and the Ottawa Ankle Rules evidence base. It is not personal medical advice and does not create a doctor–patient relationship. Decisions about X-ray, specialist referral, and return to sport are made with your GP and treating clinicians based on your specific injury and circumstances.

Patient-facing resources: HealthDirect — Ankle sprain, Better Health Channel, Australian Physiotherapy Association, Sports Medicine Australia.

Sources cited

Frequently asked questions

Do I need an X-ray for my ankle sprain?

Not always. The Ottawa Ankle Rules determine who needs X-ray and reliably identify clinically significant fractures with about 99% sensitivity. An ankle X-ray is needed if there is bone tenderness at the posterior edge or tip of either malleolus, or if you cannot take four steps immediately after the injury and in the clinic. A foot X-ray is needed if there is tenderness at the base of the fifth metatarsal or over the navicular bone, or the same inability to weight-bear. If none of these apply, X-ray is not necessary and clinical management can begin right away. These rules have been validated across thousands of patients and substantially reduce unnecessary imaging.
What is the POLICE protocol and how is it different from RICE?

RICE (Rest, Ice, Compression, Elevation) is the older approach. POLICE replaces Rest with Protection and Optimal Loading — meaning early, pain-guided movement and gentle weight-bearing from day one, rather than complete rest. The evidence shows that early mobilisation with functional support (a brace or strapping) produces faster return to function than prolonged immobilisation in a plaster cast. Protection means using a brace, not avoiding all movement. Ice is still recommended for symptomatic relief in the first 48–72 hours. Compression and elevation remain useful for managing swelling. The overall message: keep moving within a protected, pain-guided range from day one.
How long before I can return to sport?

Return to sport depends on the grade of injury. Grade I sprains (ligament stretched but intact) typically allow return in 1–2 weeks with a brace. Grade II (partial tear) usually requires 2–6 weeks of rehabilitation. Grade III (complete rupture) typically takes 4–12 weeks, with gradual progression from basic mobility to sport-specific training. Criteria for return include: pain-free walking and jogging; single-leg hop performance at least 90% of the other side; balanced single-leg stance; and completion of sport-specific drills. A brace should be worn for all sport for at least 6 months after a significant sprain to prevent re-injury.
What is chronic ankle instability and how is it prevented?

Chronic ankle instability is the feeling that the ankle gives way repeatedly, usually during walking on uneven ground or changing direction. It affects roughly 30% of people who sprain their ankle without completing a proper rehabilitation programme. The underlying problem is proprioceptive deficit — the mechanoreceptors in the damaged ligament no longer send accurate position signals to the brain, so the ankle reacts slowly to instability. Rehabilitation with balance and proprioception exercises (single-leg stance, wobble board, sport-specific agility work) directly addresses this deficit. Without rehabilitation, re-injury is common. With it, the ankle can function well even after a grade III sprain.
What injuries can look like an ankle sprain but are actually more serious?

Several injuries present with ankle pain after inversion and are missed if only an ankle X-ray is reviewed. The most important: a Maisonneuve fracture (spiral break of the proximal fibula from a rotational mechanism — the ankle X-ray appears normal, but proximal fibula tenderness reveals the injury); a fifth metatarsal base avulsion (Jones fracture, tender just distal to the ankle); an osteochondral lesion of the talus (persistent pain without swelling weeks later); a syndesmosis or high ankle sprain (worse with rotation than inversion, slower recovery); peroneal tendon dislocation (snapping sensation along the outer ankle); and Achilles tendon rupture (palpable gap in the tendon, positive Thompson test). See your GP if pain persists beyond 6 weeks.

Source quality

Sources grouped by evidence tier. AU primary tier first; international where AU is silent or lagging; named-author reconstruction where guidelines have not yet caught up. How tiers work.

T1 AU primary 8 sources
T2 International primary 1 source
- JOSPT 2021 — Ankle Stability and Movement Coordination Impairments Clinical Practice Guideline
T3 Named-author reconstruction 1 source
- Stiell IG et al. — Ottawa Ankle Rules (Ann Emerg Med 1992 / JAMA 1993)