Part of Ankle sprain
Grades of ankle sprain: what grade 1, 2 and 3 change
Warning signs, and when to get help
What are the grades of ankle sprain?
Three numbers for one ligament injury. They are points on a scale, not three separate injuries, and that is the first thing to get straight. The United States athletic training profession describes the grading as a spectrum running from no meaningful structural damage at the mild end to a complete rupture of the ligament structures at the severe end (Kaminski and colleagues, 2013).
Grade 1 sits at the mild end. Grade 3 sits at the severe end. Grade 2, the partial tear, is the middle of that same spectrum, which is why two people with a grade 2 can have quite different ankles.
The ligaments in question sit on the outside of the ankle, below and just in front of the bony bump, and they are the ones that get stretched when the foot rolls inward. That is the injury this page is about, and the ankle sprain program covers it in full.
Two injuries get mixed up with the grading scale and neither is on it. One is a sprain of the ligament that joins the two shin bones just above the joint, a high ankle sprain, which is a different structure and has its own course. The other is a broken bone, which is an ankle fracture and not a sprain of any grade. If your ankle was broken, or you have had ankle surgery, the plan from your surgical team and physio comes first and nothing on this page replaces it.
Does the grade change what you should do?
Here is where the published sources argue with each other in public, and almost nobody says so.
OrthoInfo, the patient site of the American Academy of Orthopaedic Surgeons, puts it plainly: after the examination your doctor determines the grade in order to help develop a treatment plan. On its own that makes the grade sound like the hinge the whole plan turns on.
The US physical therapy guideline does not treat it that way. When it sets out what a clinician should take into account in judging how an acute sprain is likely to go, it names eleven things: your age, your body mass index, how you cope with pain, whether you report the ankle feeling unstable, whether you have sprained it before, whether you can put weight on it, whether weight bearing hurts, how far the ankle bends upward, tenderness at the inner side of the joint line, your balance, and whether you can jump and land. The grade of the sprain is not among them. The same guideline says the evidence on what injury severity does to the course of a sprain is conflicting, and it reports that 50 to 85 percent of people say they have fully recovered at about three years regardless of how severe the sprain was (Martin and colleagues, 2021). The systematic review that figure traces back to gives a lower bottom end for the same thing, 36 percent, and both numbers are set out with their documents on sprained ankle recovery time. The clause that matters here is the one about severity, and it belongs to the guideline's own sentence.
Two reputable sources disagree, and flattening that would be dishonest. It is not permission to ignore the number either. Nothing published shows the grade to be clinically irrelevant, and a clinician may well use it in deciding whether you need a boot for a week or crutches for three days. Our reading of the two documents, offered as a reading rather than as something either of them states: the grade matters less for your exercises and your timeline than the number makes it sound, and more for the first week or so of protection. Where it does change a decision, the decision is a clinician's.
One study has tested the question directly, and its own authors are careful with it. In 65 adolescents aged 12 to 17, grouped by grade and measured at three points up to 15 weeks, there was no interaction between severity and time on the side to side differences they recorded, with one measure showing a severity effect and another not (Meškauskas and colleagues, 2026). Those authors say the severity analysis was not planned in advance, the study had limited power for it, and the findings should be treated as a question for future work. It is an adolescent population, so it does not speak for adults either. It points the same way as the guideline without proving anything.
Where severity does change the first 10 days
One recommendation in the guideline is written around severity. It is about protection, not exercise. Immobilization, meaning anything from a semi-rigid brace up to a below-knee cast, may be indicated for up to 10 days in the more severe injuries (Martin and colleagues, 2021). Read the verb as well as the number. The guideline writes this one as something that may be indicated, not as something that should be done, which is a weaker instruction than the ones it gives for loading and for exercise. After those 10 days, functional treatment takes over.
The older athletic training statement is firmer about grade 3 than the 2021 guideline is, and in the opposite direction: it says a grade 3 sprain should be immobilized for at least 10 days in a rigid stirrup brace or a below-knee cast, and controlled therapeutic exercise started after that (Kaminski and colleagues, 2013). So the two documents do not agree about whether 10 days is a ceiling or a floor. That is one more reason the decision belongs to whoever examines your ankle rather than to a web page.
The guideline also reports where that came from. Its own evidence update says the authors of the Dutch ankle sprain guideline concluded, from 3 randomized trials with 694 participants between them, that a short period of immobilization of 10 days or less with a plaster cast or a rigid support can add something in the treatment of grade 3 sprains (Martin and colleagues, 2021). So the one place the grade clearly earns its keep in the guidelines is the decision about a boot or a cast in the first week and a half, and it is a decision a clinician makes, not one to make from a web page.
Everything after that is the same program whatever the number. The guideline writes one therapeutic exercise recommendation covering protected movement, stretching, neuromuscular training, posture work and balance training, tailored to the severity of the injury alongside the impairments found, your preferences, how you learn and what gets in your way (Martin and colleagues, 2021). Tailored is not the same as different. The staged version of that program is on the ankle sprain program, and the balance half of it is set out on ankle proprioception exercises.
Why you cannot grade your own ankle
The grading is a judgement about how much of a ligament is intact, and the test for that is someone else holding your foot and feeling how far the joint moves and where it stops.
Three things get in the way on day one. Swelling fills the space the examiner is trying to feel. Pain makes the muscles guard, which stiffens a joint that may in fact be loose. And the ankle has several structures packed into the same small area, so pain in the general region does not locate the injury.
The usual answer to that is to wait a few days. The International Ankle Consortium consensus puts stability testing of the ligament at the front of the outer ankle at 4 to 6 days after the injury (Delahunt and colleagues, 2018). A delayed examination is not someone fobbing you off. It is the examination being done at the point where it can tell you something.
Imaging does not fill the gap either. The athletic training position statement states that imaging studies which assess ligament integrity are of questionable value in an acute ankle injury, because treatment decisions and outcomes are not usually influenced by what they show (Kaminski and colleagues, 2013). X-rays are a different question: those are about bone, they are decided by the Ottawa ankle rules, and that decision is urgent rather than academic. The rules and the signs that trigger them are on the ankle sprain program and on can you walk on a sprained ankle.
There is no self-administered severity test. If you have seen a chart that promises to grade your ankle from how it looks or how much it hurts, nothing in the documents behind this page supports it.
Does more bruising mean a worse sprain?
It feels as though it must, and that is the trap.
Bruising is blood that has leaked from small torn vessels, and it tracks downward with gravity, which is why it so often shows up a day or two late, well below the sore spot, and sometimes across the whole foot and into the toes. How bad an ankle looks in the first day or two is a poor guide to how badly the ligament is damaged, which is the same reason the examination that does grade it is usually delayed.
None of the sources behind this page gives a way of reading severity from the skin, and the guideline list of prognostic factors says nothing about bruise size (Martin and colleagues, 2021). What the first day does tell you is whether anything needs an X-ray, which is a different and more urgent question.
Two kinds of bruising need acting on, not measuring. Swelling or bruising that is very large, or pain that is severe and getting worse, is a same-day call. So is bruising with the ankle looking out of shape, a crack heard at the time, or a foot that is numb, cold, pale or blue, which is an emergency. The warning list at the foot of this page gives both in full.
Is a grade 3 ankle sprain the same as a torn ligament?
Yes. At grade 3 the ligament is torn through, which is what the words complete rupture mean in the grading scale (Kaminski and colleagues, 2013).
What people usually mean by the question is whether a torn ligament has to be repaired, and the answer there is normally no. The same position statement records that grade 3 sprains are often managed with functional rehabilitation, exactly as grades 1 and 2 are. The guidelines do not send a first-time lateral sprain to a surgeon, whatever the grade. A surgical opinion comes into it for the ankle that still gives way long after a thorough exercise program, which is the subject of chronic ankle instability.
A torn ligament is also not a broken bone. They can happen together, and the signs that mean a fracture needs ruling out are in the warning list. If you are in a boot or a cast because something was broken, ankle fracture rehabilitation is the page for that, and your own team's protocol outranks it.
What the grade does not tell you about how long it will take
This is the question hiding behind most searches for the grades, and the number is a poor answer to it.
OrthoInfo does give a severity-linked figure. Read it carefully, because it describes a treatment program and not a healing time: the three-phase program it sets out may take only 2 weeks for minor sprains, or up to 6 to 12 weeks for more severe injuries. Against that, the guideline reports conflicting evidence on the role of injury severity in the clinical course, and a systematic review of 31 studies found a long tail of symptoms that does not sort itself by grade (Martin and colleagues, 2021; van Rijn and colleagues, 2008).
The grade-banded tables of weeks that circulate online, the ones that give one range for a grade 1 and another for a grade 3, do not come from any document behind this page. What the readable evidence does support is set out on sprained ankle recovery time, including the ranges, where each one comes from, and the two published figures for full recovery that do not agree with each other.
The other thing the grade does not predict is whether it happens again, and that is the outcome with the best evidence attached to it. What lowers the odds is on how to prevent ankle sprains, and it is the same answer for all three numbers.
Related exercise programs
Warning signs
Get emergency help now
- Emergency: the ankle or foot looks deformed or out of place, you heard a crack when you were injured, or the foot is numb, tingling, cold, pale or blue. Go to an emergency department straight away, and do not drive yourself.
Get help today
- Same day: you could not take 4 steps right after the injury and still cannot, or the back edge or tip of either ankle bone is tender to press. Keep your weight off that foot as much as you can, leave the exercises out, and get it checked for a fracture the same day. These are part of the Ottawa ankle rules, explained on the ankle sprain page.
- Same day: the pain is in the middle of your foot, and the bony bump halfway along the outer edge of the foot or the bony bump on the inner side of the midfoot is tender to press. Keep your weight off that foot as much as you can, leave the exercises out, and get it checked for a fracture the same day, even if you can still walk on it.
- Same day: you felt a pop or snap at the back of your heel or lower calf, or it felt as if someone kicked you there, even if you can still walk and push off. Stop, take the weight off that leg carefully, and go to an urgent care center or emergency department the same day, as this can be a torn Achilles tendon rather than a sprain.
- Same day: the pain is severe and getting worse, or the swelling or bruising is very large. Get medical advice the same day.
- Same day: the ankle or foot is hot, red and swollen, or you have a fever or feel unwell. Get medical help the same day, and go to an emergency department if you feel very unwell. If you have a very high or very low temperature, shivering you cannot control, you are breathing very fast or finding it hard to breathe, you are confused or your speech is slurred, your skin, lips or tongue look blue, gray, pale or blotchy (on brown or black skin this can be easier to see on the palms of the hands or soles of the feet), or you have a rash that does not fade when you press it, call emergency services, as this can be sepsis.
- Same day: a calf or thigh that is newly swollen or getting more swollen, warm, tender, red or darker than usual, has swollen veins that are sore to touch, or has a throbbing or cramping pain that does not fit your injury or condition, or that feels different from normal muscle soreness after exercise. This can be a sign of a blood clot (deep vein thrombosis), especially after surgery, an injury, time in a cast or boot, a long trip or a spell of being much less mobile than usual. Get medical advice the same day. If you are also short of breath or have chest pain, call emergency services.
Book an appointment
- Within a week or two: the ankle keeps giving way or rolling over, even on flat ground, weeks or months after the sprain. This is not an emergency, but book an assessment with a physio or doctor in the next week or two.
Common questions
What grade ankle sprain do I have?
Nobody can tell you from the outside, including you. The grade describes the state of a ligament you cannot see, and the examination that tests it is a hands-on one. It is also often repeated: the International Ankle Consortium advises that stability testing of the ligament at the front of the outer ankle is best done 4 to 6 days after the injury rather than on day one, when swelling and guarding get in the way (Delahunt and colleagues, 2018). So the useful question on day one is not which grade this is, but whether anything needs an X-ray, and the warning list on this page gives the signs that mean yes.
Does the grade change my treatment?
Less than most people expect, and in one specific way. The US physical therapy guideline writes a single therapeutic exercise recommendation for every severity, tailored to the injury, to what the examination finds, and to what you need and prefer. Where severity does come in is early protection: a stiffer brace or a below-knee cast is allowed for up to 10 days in the more severe injuries, after which functional treatment starts (Martin and colleagues, 2021). The staged program itself is the same one, and it is on the ankle sprain program.
Does more bruising mean a worse sprain?
Not reliably. Bruising tells you that small blood vessels were torn and that gravity has moved the blood downward, which is why it often appears a day or two later and can travel into the foot and toes. None of the documents behind this page offers a way to read severity off the skin, and the guideline list of things that bear on how an ankle will do contains no mention of how much bruising there is (Martin and colleagues, 2021). Big swelling and bruising do belong in the warning list for a different reason: swelling or bruising that is very large, or pain that is severe and getting worse, needs medical advice the same day.
Is a grade 3 ankle sprain the same as a torn ligament?
Yes, that is what the words mean: at grade 3 the ligament is torn through rather than stretched or partly torn. It does not follow that it needs an operation. The United States athletic training profession position statement notes that grade 3 sprains, like grades 1 and 2, are often managed with functional rehabilitation (Kaminski and colleagues, 2013), and a surgical opinion is normally kept for an ankle that keeps giving way long after a thorough exercise program, which is covered on chronic ankle instability.
References
- Martin RL, Davenport TE, Fraser JJ, et al. Ankle Stability and Movement Coordination Impairments: Lateral Ankle Ligament Sprains Revision 2021. Journal of Orthopaedic and Sports Physical Therapy. 2021;51(4):CPG1-CPG80. https://doi.org/10.2519/jospt.2021.0302
- Kaminski TW, Hertel J, Amendola N, et al. National Athletic Trainers' Association position statement: conservative management and prevention of ankle sprains in athletes. Journal of Athletic Training. 2013;48(4):528-545. https://doi.org/10.4085/1062-6050-48.4.02
- Delahunt E, Bleakley CM, Bossard DS, et al. Clinical assessment of acute lateral ankle sprain injuries (ROAST): 2019 consensus statement and recommendations of the International Ankle Consortium. British Journal of Sports Medicine. 2018;52(20):1304-1310. https://doi.org/10.1136/bjsports-2017-098885
- van Rijn RM, van Os AG, Bernsen RM, Luijsterburg PA, Koes BW, Bierma-Zeinstra SM. What is the clinical course of acute ankle sprains? A systematic literature review. The American Journal of Medicine. 2008;121(4):324-331.e6. https://doi.org/10.1016/j.amjmed.2007.11.018
- American Academy of Orthopaedic Surgeons. Sprained Ankle. OrthoInfo. https://www.orthoinfo.org/bodypart/foot-ankle/sprained-ankle/
- Meškauskas M, Rutkauskas S, Misiūnienė M, et al. Association between injury severity and recovery of objective functional measures following adolescent lateral ankle sprain: a secondary cohort analysis. Frontiers in Sports and Active Living. 2026;8:1966025. https://doi.org/10.3389/fspor.2026.1966025
Written and checked by the PocketPhysio editorial team. Last updated 2026-11-06.
This page is general education, not a diagnosis or a personal treatment plan. See a physiotherapist or doctor for advice about your own situation.