Ankle Sprain Still Hurts After Weeks or Months: What Could Have Been Missed?

Short answer: An ankle sprain can remain sore or swollen for some time, especially after a more substantial injury. However, pain that is not steadily improving, repeatedly returns with activity, causes giving way, or persists for weeks or months deserves reassessment. The explanation may be incomplete ligament recovery or insufficient rehabilitation, but it could also be a tendon injury, cartilage damage, a high ankle sprain, an unrecognised fracture, joint impingement, nerve irritation or a different condition. The next step should be based on the current symptoms, examination findings, previous treatment and the patient’s goals—not simply another generic course of rest, painkillers or the same exercises.

When persistent pain needs urgent or prompt assessment

Seek urgent or prompt medical assessment if any of the following occurs after an ankle injury:

• the ankle or foot is deformed, or you cannot bear weight;
• pain or swelling is severe, rapidly worsening or returning after initial improvement;
• there is marked tenderness directly over a bone, especially after a new twist or fall;
• the ankle locks, repeatedly catches or cannot move normally;
• the foot becomes cold, pale, blue, severely numb or suddenly weak;
• the ankle is hot and red, particularly with fever, a wound or feeling unwell;
• a person with diabetes or reduced sensation develops unexpected warmth, swelling, colour change, blistering or a wound;
• one calf becomes unexpectedly swollen or painful, especially with chest pain, faintness or breathlessness.

These features can indicate fracture, dislocation, infection, impaired circulation, nerve injury or a blood clot rather than a routine recovery. For a life-threatening emergency in Singapore, call SCDF 995.^[1]

How long should an ankle sprain take to improve?

There is no single normal recovery date. A mild sprain may settle relatively quickly, while a more significant ligament injury can require a longer period of protection, progressive loading and rehabilitation. Swelling can linger after pain and walking have improved. Return to running, court sport or heavy manual work generally requires more than being able to walk around the house.

The direction of recovery is often more useful than the calendar. Pain, swelling, movement, confidence and function should gradually improve. Reassessment becomes more important when progress has stopped, normal daily activities remain substantially restricted, the ankle repeatedly gives way, pain is focal over bone or tendon, or symptoms worsen whenever activity is resumed.

A label such as “grade 1” or “grade 2” does not tell the whole story. Recovery also depends on associated injuries, previous sprains, balance and strength, work or sport demands, health conditions, footwear, rehabilitation exposure and whether the original diagnosis was correct.

What could have been missed after an ankle sprain?

Persistent pain does not prove that something serious was missed. It does mean that the working diagnosis should be checked against the patient’s present pattern rather than assumed from the first day’s swelling and bruising.

1. The ligament has healed incompletely or the ankle remains unstable

The outer ankle ligaments are commonly injured when the foot rolls inward. Even after swelling settles, the ankle may remain weak, stiff or poorly controlled. Some patients have mechanical laxity; others mainly have impaired balance, delayed protective reactions or lack of confidence. Many have a mixture.

Clues include repeated rolling, giving way on uneven ground, apprehension during direction changes and recurrent swelling after activity. Chronic lateral ankle pain after a sprain can result from incomplete healing and recurrent instability.^[2] The solution is not always prolonged rest. It may require a graded programme addressing movement, strength, balance, task-specific control and appropriate bracing.

2. The injury involved the syndesmosis, or “high ankle sprain”

The syndesmosis connects the lower ends of the tibia and fibula above the ankle. It may be injured when the foot twists outward or the leg rotates over a planted foot. Pain can sit higher than a typical outer-ligament sprain and may be aggravated by twisting, stairs, pushing off or squeezing the lower leg.

High ankle sprains can take longer to recover and may need different protection or specialist input if unstable. A patient who was treated for a routine lateral sprain but remains unable to push off, rotate or return to sport should be reassessed for this pattern.

3. A fracture was not visible or not suspected initially

Small avulsion fractures, talar injuries and fractures in the foot can accompany a twisting injury. A stress injury may also develop or become more apparent later. Some fractures are difficult to see on an early X-ray, and an ankle-only image may not adequately show a painful area in the foot.

Persistent focal bone tenderness, inability to progress weight bearing or pain that intensifies with impact should prompt reconsideration. Repeat X-rays, CT or MRI may be considered when the result would change protection, weight-bearing or referral decisions.

4. Cartilage and underlying bone were injured

A twist can injure the cartilage and bone of the talar dome. An osteochondral lesion may cause deep ankle pain, recurrent swelling, catching or locking. It may not appear on a routine early X-ray. MRI is often considered when these symptoms persist and the diagnosis would influence treatment; CT can provide detailed bone information in selected cases.

5. A peroneal tendon was irritated, torn or unstable

The peroneal tendons run behind the outer ankle bone. They can be overloaded or injured during a sprain. Pain behind the outer ankle, swelling along a tendon, weakness when turning the foot outward, or painful snapping can suggest a tendon problem. A tendon may occasionally move out of its normal groove after injury to the tissue that holds it in place.

Dynamic ultrasound can assess tendon movement in real time, while MRI may help evaluate a suspected tear or associated structures. Repeating balance exercises without recognising a mechanically unstable tendon may not address the problem.

6. Scar tissue or impingement is being pinched

Inflamed tissue or scar tissue can occupy space around the ankle after a sprain and become pinched during movement. Anterior impingement often causes pain at the front of the ankle during a deep squat, stairs or uphill walking. Pain can also occur on the outer side below the ankle. Examination should identify the painful movement and exclude instability, cartilage injury and tendon problems before treatment is selected.

7. Another tendon, joint or alignment problem is contributing

Persistent pain may arise from the Achilles, posterior tibial or other tendons; the subtalar joint below the ankle; pre-existing arthritis; or foot alignment that changes load. The initial sprain may have aggravated a previously silent problem. Pain location, footwear response, hindfoot movement, arch behaviour and activity pattern help separate these possibilities.

8. A nerve was stretched, compressed or sensitised

Burning, electric pain, tingling, numbness or unusual skin sensitivity is less typical of a simple ligament recovery. Swelling, direct trauma, scar tissue or a problem higher in the leg can irritate a nerve. Progressive weakness, foot drop or widespread numbness requires prompt neurological assessment.

9. The rehabilitation dose did not match the injury

Too little loading can leave the ankle stiff, weak and unprepared. Too much loading, especially repeated jumping or running before basic control has returned, can repeatedly flare symptoms. A programme can also fail when it is technically reasonable but does not match the patient’s job, sport, footwear, schedule or capacity to follow it.

Evidence-based ankle-sprain rehabilitation commonly includes progressive weight bearing, movement, strengthening, balance or neuromuscular work, and activity-specific progression; bracing and manual therapy may be appropriate in selected phases.^[3] Exercises should be progressed and adapted, not merely handed out once.

10. Pain has become more persistent even though tissues are no longer acutely injured

After a prolonged painful period, sleep disruption, fear of another sprain, reduced activity and increased nervous-system sensitivity can amplify symptoms and reduce confidence. This does not mean the pain is imagined. Structural and neurological causes should still be assessed. When serious or unstable pathology is not found, graded exposure, education and restoration of meaningful function may be more useful than repeatedly searching for a single damaged structure.

What should be checked at the reassessment?

The reassessment should begin with what has changed since the original injury. Useful questions include:

• How did the ankle twist, and was there a snap, pop or immediate swelling?
• Could you take four steps immediately afterwards, and can you now?
• Where is the pain: over a bone, in front of the ankle, behind the outer ankle, above the ankle or deep in the joint?
• Does the ankle swell, catch, lock, snap or give way?
• Are there burning sensations, tingling, numbness or weakness?
• Which treatments, braces and exercises have been tried, for how long, and what happened?
• Has activity been reduced too much or increased too quickly?
• What must the patient return to: desk work, standing, driving, manual work, running or pivoting sport?
• What result matters most: pain reduction, confidence, speed of return, avoiding medication or avoiding surgery?

Clinical examination may include gait, alignment, swelling, bruising, precise bone and soft-tissue tenderness, ankle and subtalar movement, ligament stress tests, syndesmosis tests, tendon strength and movement, sensation, circulation, calf function and balance. Functional tests such as a single-leg heel raise, squat, hop, landing or direction change may be added only when safe and relevant to the patient’s goal.

No single test proves every diagnosis. A ligament stress test, for example, must be interpreted alongside symptoms, guarding, time since injury and the demands that trigger the problem.

When may X-ray, ultrasound, CT or MRI be considered?

Imaging is most useful when it answers a specific question and could change management. The American College of Radiology separates chronic ankle imaging according to suspected tendon abnormality, instability, cartilage lesion, impingement or pain of uncertain cause.^[4]

X-ray

X-rays may be considered when there is focal bone tenderness after injury, difficulty bearing weight, persistent pain, suspected arthritis, alignment concerns or possible impingement. Weight-bearing views may be useful for selected alignment or joint-space questions. A normal X-ray does not show every cartilage, tendon or ligament problem and may not exclude an occult fracture.

Ultrasound

Ultrasound can examine accessible tendons and selected ligaments. It can be particularly useful for a peroneal tendon that snaps or moves abnormally because the structure can be viewed during movement. It is operator dependent and does not assess every deep joint structure equally well.

CT

CT gives detailed information about bone, fracture healing, joint surfaces and selected impingement problems. It involves ionising radiation and is not the preferred test for every tendon or ligament question.

MRI

MRI may be considered when persistent symptoms suggest an osteochondral lesion, occult fracture, tendon injury, ligament problem, synovitis, impingement or another soft-tissue cause. It can be helpful before selected procedures or surgical referral. However, an MRI finding should match the patient’s pain and examination; old ligament changes may be present without being the current pain source.

If symptoms are improving as expected and examination does not suggest an associated injury, immediate advanced imaging may not alter treatment. Conversely, a normal early X-ray should not be used to dismiss persistent focal pain, locking or progressive loss of function.

Treatment after an ankle sprain has failed to improve

The treatment should match the reason for persistence. “Try harder” is not an adequate plan when the diagnosis, dosage or goal may be wrong.

Protection, bracing and activity modification

A brace, tape, supportive footwear or temporary reduction in load can help selected ligament injuries and instability. A boot or restricted weight bearing may be required for some fractures, high ankle sprains or substantial tendon injuries. Protection should have a defined purpose and review point; unnecessary prolonged immobilisation can increase stiffness and weakness.

Medication and symptom control

Simple pain relief or anti-inflammatory medicine may be considered when medically appropriate. Choice depends on health conditions, allergies, other medicines and duration of use. Medication can make movement or sleep more manageable, but it does not restore balance, stabilise a tendon, repair cartilage or prove that return to sport is safe.

Revised physiotherapy and graded rehabilitation

A second course of physiotherapy should not automatically repeat the first. The programme may need to address a missing component such as ankle dorsiflexion, calf capacity, peroneal strength, single-leg control, rapid reactions, landing, running tolerance or confidence. Load can be adjusted to avoid the cycle of complete rest followed by an abrupt return.

Manual therapy or other passive modalities may temporarily improve pain or movement for selected patients. They are usually most useful when linked to a functional progression. Passive treatment alone cannot restore the capacity needed for prolonged standing, uneven-ground walking or pivoting sport.

Injections

An injection is not a general solution for an ankle that still hurts. It may be considered for a clearly identified joint, synovial or impingement-related pain source after the diagnosis and alternatives are discussed. Injection around a tendon requires particular care because of tissue risks. Pain relief from an injection does not automatically mean the ankle is ready for unrestricted load.

Platelet-rich plasma and other biologic or emerging procedures are promoted for some ligament, tendon and cartilage conditions, but evidence, preparation methods and regulatory status vary. They should not be presented as proven upgrades simply because standard rehabilitation has been frustrating.

Surgical opinion

Surgical assessment may be appropriate for selected patients with recurrent mechanical instability, an unstable syndesmosis injury, significant tendon tear or displacement, symptomatic loose body or cartilage lesion, non-healing fracture, or persistent structural impingement after appropriate non-surgical care. The proposed procedure, likely benefit, risks, rehabilitation period and fit with the patient’s priorities should be clear.

Which next step fits the patient’s situation?

“I have already completed physiotherapy, but the ankle still hurts”

Review what physiotherapy actually addressed and whether the diagnosis was reconsidered when progress stalled. Persistent focal tendon pain, snapping, locking, deep swelling or bone tenderness may justify targeted imaging. If the main deficits remain strength, balance or load tolerance, a revised and more task-specific programme may still be appropriate.

“I need to return to work next week”

The first question is whether the required walking, standing, climbing, driving or carrying is safe. Short-term bracing, supportive footwear, shorter activity blocks or modified duties may help. A suspected fracture, unstable high ankle sprain or significant tendon injury may require protection despite the deadline. No assessment can guarantee recovery within a week, but it can help define safe interim duties and a staged return.

“I need to return to football, basketball or running”

Low pain at rest is not enough. Return decisions may consider swelling response, range of motion, calf and ankle strength, balance, hopping, landing, cutting, fatigue and confidence. A brace may reduce risk in selected situations, but it should not conceal unresolved pain or substitute for rehabilitation.

“I am not keen on exercise and prefer a passive treatment”

Your preferences should be discussed openly. A brace, footwear adjustment, medication or selected hands-on treatment may reduce symptoms. If weakness, poor balance or reduced load capacity is contributing, some active rehabilitation is usually needed to change those deficits. The programme can be kept focused, tolerable and tied to the activities you value rather than becoming an extensive generic routine.

“My X-ray was normal, so I want an MRI”

MRI may be reasonable when the current history and examination suggest cartilage, occult bone, tendon, ligament or impingement pathology and the result would change care. Ultrasound may be more useful for a dynamically snapping tendon, while CT may better answer a detailed bone question. The choice should follow the suspected diagnosis, not a hierarchy in which MRI is automatically “better.”

“I want an injection because painkillers and exercises did not work”

Failure of previous care is a reason to reassess the pain source before choosing a procedure. An injection may help a selected inflammatory joint or impingement problem, but it is not appropriate for every ligament, fracture, cartilage or tendon condition. Ask what structure will be targeted, what benefit is realistic, what risks apply and what rehabilitation is still required afterwards.

“My scan shows a ligament tear, and I am worried I need surgery”

A scan finding alone does not determine treatment. The decision also depends on mechanical stability, repeated giving way, pain location, functional limitations, associated injuries and response to an appropriate rehabilitation programme. Some patients improve without surgery; others with persistent structural instability may benefit from a specialist opinion.

How should improvement be measured?

Useful measures should reflect the patient’s goal and may include:

• walking and standing tolerance;
• pain location and swelling after a standard amount of activity;
• ankle movement and calf strength;
• frequency of giving way, snapping, catching or locking;
• single-leg balance and confidence on uneven ground;
• ability to climb stairs, drive or complete job tasks;
• running, hopping, landing and direction-change capacity when relevant;
• healing on follow-up imaging when the injury requires it.

A plan should include a review point and an alternative if progress stalls. Worsening bone pain, new inability to bear weight, recurrent locking, tendon displacement, increasing numbness, marked heat or redness requires reassessment rather than simply increasing exercise.

Integrated doctor and physiotherapy management

The Pain Relief Clinic has in-house physiotherapists who can work with the licensed medical doctor for integrated management. This can help coordinate reassessment of the working diagnosis, decisions about imaging or protection, symptom-control options, progressive rehabilitation and return-to-work or sport planning.

Integrated care can be particularly useful when previous treatment has failed, when a scan needs to be matched to the examination, or when the safe rehabilitation dose is uncertain. Physiotherapists practising in Singapore should be appropriately registered.^[5]

Insurance referrals and supporting paperwork

The clinic can assist with clinically appropriate referrals and supporting paperwork for insurance claims. Coverage, required documents, pre-authorisation and reimbursement depend on the patient’s policy and insurer. A referral, form or medical report does not guarantee approval or payment.

Before imaging, physiotherapy or a procedure, patients may wish to ask their insurer whether a doctor’s referral, panel provider, pre-authorisation, itemised invoice, imaging report or medical report is required.

Frequently asked questions

Is it normal for a sprained ankle to hurt after several weeks?

Some pain or swelling can persist after a substantial sprain, particularly with activity. It should generally show a trend towards improvement. Stalled progress, focal bone or tendon pain, giving way, locking, neurological symptoms or repeated swelling warrants reassessment.

Why does my ankle hurt again when I start running?

The ankle may not yet have the strength, movement, balance or impact tolerance required for running. Other possibilities include instability, tendon injury, cartilage damage, impingement or an occult bone problem. The location and timing of pain help guide assessment.

Can an ankle fracture be missed on the first X-ray?

Some subtle, occult or stress injuries may not be apparent initially. Persistent focal bone tenderness or inability to progress weight bearing may lead to repeat X-rays, CT or MRI, depending on the suspected injury and how the result would change care.

Do I need MRI if my ankle sprain has not healed?

Not automatically. MRI may be useful for selected cartilage, occult bone, tendon, ligament or impingement questions. Ultrasound or CT may be more appropriate for other questions. Clinical reassessment should determine which test, if any, is likely to change treatment.

Can a chronic ankle sprain still improve with physiotherapy?

Many patients can improve when rehabilitation addresses the specific movement, strength, balance and task deficits. A programme that has failed should be reviewed rather than simply repeated. Structural instability, significant tendon injury or another diagnosis may require additional management.

Does persistent swelling mean the ligament is still torn?

No. Swelling can persist for several reasons and does not reveal ligament status by itself. Its location, triggers, associated pain and examination findings matter. Heat, redness, calf swelling or systemic illness requires prompt assessment.

Will an ankle brace weaken my ankle?

A brace can provide useful short-term protection or reduce recurrent sprain risk in selected activities. It is commonly combined with rehabilitation rather than used as the only long-term strategy. Fit, skin comfort, circulation and the reason for bracing should be reviewed.

Arrange an assessment for persistent ankle pain in Singapore

If an ankle sprain is not steadily improving, keeps swelling, gives way, catches or remains painful despite previous treatment, an assessment can review the original injury, present examination, functional goals and whether different rehabilitation, imaging, protection, medication, a procedure or specialist referral may be appropriate.

The Pain Relief Clinic
350 Orchard Road, #10-00 Shaw House
Singapore 238868
Telephone: +65 9068 9605

Not every investigation or treatment discussed on this page is required, offered or recommended by the clinic. Availability and permissible use of tests, medicines, devices, injections and emerging treatments in Singapore may change with evolving Ministry of Health, Health Sciences Authority and Singapore Medical Council requirements. Individual decisions require clinical assessment and should follow current Singapore regulations and professional guidance.

References

1. Singapore Civil Defence Force. Emergency Medical Services.
2. American Orthopaedic Foot & Ankle Society. Chronic Lateral Ankle Pain.
3. Martin RL, Davenport TE, Fraser JJ, et al. Ankle Stability and Movement Coordination Impairments: Lateral Ankle Ligament Sprains Revision 2021. Journal of Orthopaedic & Sports Physical Therapy.
4. American College of Radiology. ACR Appropriateness Criteria: Chronic Ankle Pain.
5. Allied Health Professions Council Singapore. Search the register.

Disclaimer: This information is provided for general reference only and should be used in consultation with your licensed medical doctor. It is not a diagnosis or a substitute for personalised medical advice. Seek urgent care for severe, rapidly worsening or warning-feature symptoms.

Reviewed by Dr Terence Tan — 13 September 2026