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Ankle Sprain
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In one pass Miss a step, or land on someone's foot, and the sole suddenly rolls inward, with a sharp pain on the outside of the ankle.
Educational content, not medical advice — consult a clinician.
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Chapter 1
What happens in a rolled ankle
Miss a step, or land on someone's foot, and the sole suddenly rolls inward, with a sharp pain on the outside of the ankle. This is the most common ankle sprain, the lateral sprain, and it is also one of the most common injuries in sport.
The ankle is not one joint but several working together: one between the shin bone and the talus, another below the talus, and a connection between the lower ends of the two lower-leg bones. A lateral sprain typically happens when the rearfoot rolls in too far while the lower leg is turned outward. That roll strains the ligaments on the outside of the ankle, which hold the bones in the right place. Ligaments are like short cords: a mild sprain stretches the fibers, and a severe one tears some or all of them.
If you cannot walk on the foot at all after the injury, or the bony bumps on either side of the ankle hurt when pressed, see a doctor first; you may need an X-ray to rule out a fracture.
The ankle is not one joint but several working together: one between the shin bone and the talus, another below the talus, and a connection between the lower ends of the two lower-leg bones. A lateral sprain typically happens when the rearfoot rolls in too far while the lower leg is turned outward. That roll strains the ligaments on the outside of the ankle, which hold the bones in the right place. Ligaments are like short cords: a mild sprain stretches the fibers, and a severe one tears some or all of them.
If you cannot walk on the foot at all after the injury, or the bony bumps on either side of the ankle hurt when pressed, see a doctor first; you may need an X-ray to rule out a fracture.
Chapter 2
No pain is not the same as healed
A week or two after a sprain, the swelling is down and walking no longer hurts, so many people assume it has healed. But pain fading and the ligament healing run on two different clocks.
A systematic review pooling randomized trials that measured ligament looseness found that ankle laxity improved gradually over 6 weeks to 1 year, and that ligament healing took at least 6 weeks to 3 months. At 6 months, 3% to 31% of people still had a positive anterior drawer test (a clinician pushes on the ankle and it is still loose); up to a year after the injury, 7% to 42% still felt the ankle was unstable.
What these numbers say: the pain is long gone while the cords are still slowly rebuilding. Going straight back to running and jumping as if nothing happened, during that window, is exactly when the next sprain comes most easily.
A systematic review pooling randomized trials that measured ligament looseness found that ankle laxity improved gradually over 6 weeks to 1 year, and that ligament healing took at least 6 weeks to 3 months. At 6 months, 3% to 31% of people still had a positive anterior drawer test (a clinician pushes on the ankle and it is still loose); up to a year after the injury, 7% to 42% still felt the ankle was unstable.
What these numbers say: the pain is long gone while the cords are still slowly rebuilding. Going straight back to running and jumping as if nothing happened, during that window, is exactly when the next sprain comes most easily.
Chapter 3
Why one sprain invites the next
The most common predisposition to a sprain is a previous sprain. Why?
An ankle that keeps giving way has two possible sources, and they often occur together. One is mechanical: the ligament heals loose, and the bones move beyond their normal range. The other is functional: the bones and ligaments look fine, but proprioception and neuromuscular control have fallen short.
Proprioception is the body knowing where a joint is without looking. Standing steady depends on the brain combining position signals from the eyes, the vestibular system of the inner ear (the organ that senses head position and movement), and the joints and muscles, and constantly re-weighting them. The ligaments and tissues around the ankle are themselves position reporters. After an injury that signal can get worse, and so does the body's ability to sense the ankle starting to roll and correct it.
That is why waiting for the swelling to go down is not enough: what was injured is not only the cords but also the wiring that reports position, and that wiring needs to be trained back on purpose.
An ankle that keeps giving way has two possible sources, and they often occur together. One is mechanical: the ligament heals loose, and the bones move beyond their normal range. The other is functional: the bones and ligaments look fine, but proprioception and neuromuscular control have fallen short.
Proprioception is the body knowing where a joint is without looking. Standing steady depends on the brain combining position signals from the eyes, the vestibular system of the inner ear (the organ that senses head position and movement), and the joints and muscles, and constantly re-weighting them. The ligaments and tissues around the ankle are themselves position reporters. After an injury that signal can get worse, and so does the body's ability to sense the ankle starting to roll and correct it.
That is why waiting for the swelling to go down is not enough: what was injured is not only the cords but also the wiring that reports position, and that wiring needs to be trained back on purpose.
Chapter 4
Move early, train balance, brace when needed
An overview that compared more than forty systematic reviews side by side reads in two parts.
Right after the sprain (easing pain and swelling, restoring function): the evidence is strong for early mobilization and for non-steroidal anti-inflammatory drugs (such as ibuprofen), moderate for exercise and manual therapy, and insufficient for ultrasound therapy. Early mobilization means moving the ankle and putting weight on it as soon as you can tolerate it, rather than keeping it immobilized for a long time.
Preventing the next sprain: the evidence is strong for bracing and moderate for neuromuscular training (balance work, standing on one leg, standing on unstable surfaces). A sprain damages the wiring that reports the ankle's position, and balance training is aimed at exactly that wiring.
What these share: none of them is waiting. Early mobilization and balance training both get the ankle moving and training within what it can tolerate.
Right after the sprain (easing pain and swelling, restoring function): the evidence is strong for early mobilization and for non-steroidal anti-inflammatory drugs (such as ibuprofen), moderate for exercise and manual therapy, and insufficient for ultrasound therapy. Early mobilization means moving the ankle and putting weight on it as soon as you can tolerate it, rather than keeping it immobilized for a long time.
Preventing the next sprain: the evidence is strong for bracing and moderate for neuromuscular training (balance work, standing on one leg, standing on unstable surfaces). A sprain damages the wiring that reports the ankle's position, and balance training is aimed at exactly that wiring.
What these share: none of them is waiting. Early mobilization and balance training both get the ankle moving and training within what it can tolerate.
Chapter 5
X-ray or not, and when to see a doctor
Many people's first instinct after a sprain is to get an X-ray, for fear of a fracture. Clinicians use a simple rule based on a physical exam, the Ottawa ankle rules, to decide who needs one: they mainly check whether the back edge or tip of the bony bumps on either side of the ankle (the malleoli), or a few bones in the middle of the foot, hurt when pressed, and whether you can walk a few steps on your own after the injury. A systematic review pooling many studies found that the rules had a sensitivity (the share of people with a real fracture whom the rules flag for an X-ray) of almost 100% for ankle and mid-foot fractures, and that using them should cut unnecessary X-rays by 30% to 40%. In other words, when a clinician examines you and judges an X-ray unnecessary, the chance of an actual fracture is low.
See a doctor in person promptly, rather than treating it as an ordinary sprain at home, if:
you cannot bear weight on the foot at all after the injurythe ankle or foot looks clearly deformedthe foot or toes are numb, cold, pale or bluishweeks later it still keeps giving way or the pain is not steadily easing
This site provides general education and advice. It does not replace a physician's diagnosis and treatment.
See a doctor in person promptly, rather than treating it as an ordinary sprain at home, if:
you cannot bear weight on the foot at all after the injurythe ankle or foot looks clearly deformedthe foot or toes are numb, cold, pale or bluishweeks later it still keeps giving way or the pain is not steadily easing
This site provides general education and advice. It does not replace a physician's diagnosis and treatment.
References · 6
- Hertel, J. (2002). Functional anatomy, pathomechanics, and pathophysiology of lateral ankle instability. Journal of Athletic Training, 37(4), 364-375. Lateral ankle sprains are among the most common sports injuries; the ankle functions as a complex of talocrural, subtalar and inferior tibiofibular joints; lateral sprains typically occur with excessive rearfoot supination on an externally rotated lower leg. The most common predisposition to a sprain is a previous sprain. Chronic instability may be mechanical (pathologic laxity, arthrokinematic change, synovial irritation, degeneration), functional (insufficient proprioception and neuromuscular control) or most likely both. The abstract does not name a specific ligament. pubmed.ncbi.nlm.nih.gov/12937557
- Hubbard, T. J., & Hicks-Little, C. A. (2008). Ankle ligament healing after an acute ankle sprain: an evidence-based approach. Journal of Athletic Training, 43(5), 523-529. Systematic review of 7 RCTs measuring laxity: ankle laxity improved over 6 weeks to 1 year; ligament healing took at least 6 weeks to 3 months; positive anterior drawer persisted in 3-31% at 6 months; felt instability in 7-42% up to 1 year. 10.4085/1062-6050-43.5.523
- Bronstein, A. M. (2016). Multisensory integration in balance control. Handbook of Clinical Neurology, 137, 57-66. Review of how visual, proprioceptive, and vestibular inputs interact and are reweighted in upright postural control. 10.1016/B978-0-444-63437-5.00004-2
- Doherty, C., Bleakley, C., Delahunt, E., & Holden, S. (2017). Treatment and prevention of acute and recurrent ankle sprain: an overview of systematic reviews with meta-analysis. British Journal of Sports Medicine, 51(2), 113-125. 46 reviews (mean AMSTAR 6.5/11). Acute sprain, pain/swelling/function: strong evidence for NSAIDs and early mobilisation, moderate for exercise and manual therapy, conflicting for surgery and acupuncture, insufficient for ultrasound. Preventing recurrence: strong evidence for bracing, moderate for neuromuscular training. 10.1136/bjsports-2016-096178
- Bachmann, L. M., Kolb, E., Koller, M. T., Steurer, J., & ter Riet, G. (2003). Accuracy of Ottawa ankle rules to exclude fractures of the ankle and mid-foot: systematic review. BMJ, 326(7386), 417. 27 studies, 15,581 patients. Pooled negative likelihood ratio 0.08 for ankle and mid-foot (0.07 in children); at 15% fracture prevalence, a negative rule leaves under 1.4% probability of fracture. Sensitivity almost 100%, modest specificity; use should cut unnecessary radiographs by 30-40%. 10.1136/bmj.326.7386.417
- Stiell, I. G., Greenberg, G. H., McKnight, R. D., Nair, R. C., McDowell, I., & Worthington, J. R. (1992). A study to develop clinical decision rules for the use of radiography in acute ankle injuries. Annals of Emergency Medicine, 21(4), 384-390. The derivation study of the Ottawa ankle rules (prospective, 2 university emergency departments, 750 adults with acute blunt ankle injury). All 70 significant malleolar fractures were in people with pain near the malleoli who were aged 55 or older, had bone tenderness at the posterior edge or tip of either malleolus, or could not bear weight both immediately after the injury and in the emergency department (100% sensitive, 40.1% specific, 36.0% fewer ankle radiographs); all 32 midfoot fractures were in people with midfoot pain and bone tenderness at the base of the fifth metatarsal, the cuboid or the navicular (abstract, PMID 1554175). The refined rules were validated in Stiell 1993, JAMA: sensitivity 1.0 for malleolar and midfoot fractures, with an estimated 34% fewer ankle and 30% fewer foot radiographs (abstract, PMID 8433468). 10.1016/s0196-0644(05)82656-3