Ankle Sprain
Protect It Briefly, Then Start Moving
General information from an emergency physician. It adds to your discharge papers and does not replace them or your own doctor. What this site is and isn’t
Key Takeaways:
- A sprain stretches or tears the ligaments that steady the ankle.
- For most mild or moderate sprains, early supported movement works better than long rest or a cast.
- Return if you are not improving by 5 to 7 days, cannot bear weight, or have pain far worse than expected.
About Your Diagnosis & ED Workup
Ligaments connect bones and help steady the ankle. Most ankle sprains affect the ligaments on the outside after the foot rolls inward. A high ankle sprain is a different injury. It can happen when the foot turns outward and may take longer to heal.
The Ottawa ankle and foot rules help a clinician decide when an x-ray is needed. They check where the bone hurts and whether the person can take four steps. The rules are very sensitive for an important fracture, but they do not diagnose ligament grade or every hidden bone, cartilage, or tendon injury. A normal x-ray does not mean that nothing is injured.
First Steps & Evidence-Based Home Care
Protect and load: days 0 to 10
Use the brace, wrap, or crutches in the discharge plan. For a typical mild or moderate sprain, put weight on the ankle as pain allows. Functional support and early loading work better than long immobilization. A severe Grade III sprain may need up to 10 days of immobilization, so do not override the individual plan.
Compression can help swelling. Ice is often used, but evidence for benefit during the early phase is uncertain.
Move and strengthen: start around days 1 to 3
When allowed by the discharge plan, begin gentle ankle motion and light resistance work in a pain-free range. Starting during days 1 to 3 can shorten recovery. Avoid forceful, unprotected inward rolling of the foot early because that repeats the common injury motion.
Add balance work when full loading is comfortable
Progress to single-leg balance and heel raises when standing fully on the ankle is comfortable. A structured balance program lowers the risk of another sprain. About five people need to train to prevent one repeat sprain. Home rehab works about as well as supervised physical therapy for many uncomplicated Grade I or II sprains, though athletes and people with severe injuries may benefit more from supervision.
Timeline & Expected Recovery Course
Recovery depends on the injury and treatment. In trials, people with Grade I sprains returned to normal stair climbing in about 5.5 days with a functional brace, compared with about 12 days with an elastic wrap. For Grade II sprains, the time was about 11.7 days with functional support, compared with about 28 days in a cast. These are study averages, not deadlines for one person.
Grade III sprains heal more slowly and vary more. No improvement by 5 to 7 days, or a recovery that stalls, needs reassessment for a hidden fracture, cartilage injury, tendon injury, or high ankle sprain.
Some people develop repeated sprains or lasting ankle instability. About 40% develop chronic ankle instability, which is why balance and strength work matter after pain improves.
Emergency Red Flags: When to Return Immediately
Return to the emergency department for any of these. This list is not exhaustive.
- No improvement by 5 to 7 days, or recovery that stalls, because another injury may have been missed.
- Ongoing inability to bear weight, increasing pain or swelling, a visible deformity, or new pain focused over ankle or foot bone, because a fracture or more severe injury may need another look.
- Pain far worse than the injury looks, pain above the ankle joint, or an outward-twisting injury, because these can point to a high ankle sprain that needs different care.
- New numbness or a cold or pale foot, because blood flow or nerve function may be affected.
- Signs of infection, because the diagnosis and treatment need reassessment.
Reviewed September 3, 2026