Ankle sprains are among the most common injuries for athletes and non-athletes alike. Here's how sprains are graded, what else can get hurt, what physical therapy should include, and why good rehab matters for preventing chronic ankle instability.
What is a lateral ankle sprain?
The most frequent type of ankle sprain is an inversion sprain, also called a lateral ankle sprain. It happens when you step down without enough stability in the weight-bearing leg, so the leg rolls outward while the foot turns inward. That motion places excessive stress on the lateral ligaments, which support the outside of the ankle.
Severity can range from mild overstretching to a complete ligament rupture.
Ankle sprain grades I to III
| Grade | Ligament injury | Common symptoms |
|---|---|---|
| Grade I | Microscopic ligament injury without full stretching | Mild swelling, slight tenderness, minimal functional limitations |
| Grade II | Partial (macroscopic) stretching of the ligament, but no full tear | Moderate swelling, bruising, pain, and noticeable loss of ankle stability, range of motion, and efficient walking mechanics |
| Grade III | Complete rupture of the ligament | Significant swelling, extensive bruising, severe tenderness and pain, and major limitations, especially with weight-bearing and walking |
A grade I sprain typically recovers in about 2 weeks.
Other injuries that can come with an ankle sprain
A lateral ankle sprain doesn't only affect ligaments. The same mechanism of injury can also damage muscles, bones, and joints of the lower leg and foot. Severe ankle sprains can lead to ankle fractures and muscle strains or tears. Depending on severity, treatment may include crutches, immobilization, or surgery.
That's why it's important to see a healthcare provider early. They can determine the full extent of the injury and guide the right plan of care.
Ankle sprain treatment and rehab
Initial treatment varies with severity, but physical therapy is a key part of recovery for most ankle sprains. The goal is to restore movement, strength, stability, and confidence. A complete physical therapy plan should focus on:
- Decreasing pain and swelling
- Improving ankle range of motion
- Restoring gait mechanics
- Increasing load tolerance
- Strengthening the muscles of the foot, ankle, and lower leg
Rehab should progress gradually and be tailored to the demands of your daily activity, work, or sport. For more on managing swelling, see Should I ice it?
Chronic ankle instability is preventable
Most ankle sprains recover well, but some people develop chronic ankle instability: repeated sprains, persistent weakness, or a feeling that the ankle is "giving out." Some studies estimate that up to 20% of patients experience chronic ankle instability after an ankle sprain.
That makes early, progressive physical therapy crucial. Proper rehab treats the current injury and reduces the risk of future sprains and long-term instability.
Pain isn't the best measure of progress
Pain is not the best metric for judging your ankle rehab. To return to full performance and lower your risk of reinjury, you need adequate:
- Strength
- Range of motion
- Neuromuscular control
Consistent, well-structured rehabilitation is the key to long-term ankle health.
Rolled your ankle? Our physical therapists can assess the injury and guide your rehab back to full strength.
book a sessionthe takeaway
Most ankle sprains recover well with the right rehab. Judge progress by strength, range of motion, and control, not pain alone, to lower your risk of chronic instability.
Frequently asked questions
What are the grades of an ankle sprain?
Grade I is a microscopic ligament injury without full stretching. Grade II is partial stretching of the ligament without a full tear. Grade III is a complete rupture of the ligament.
How long does a mild ankle sprain take to heal?
A grade I sprain typically recovers in about 2 weeks.
Should I see a provider for an ankle sprain?
Yes, early. The same mechanism can injure muscles, bones, and joints, and severe sprains can lead to fractures or muscle tears. A healthcare provider can determine the full extent of the injury and guide your plan of care.
What is chronic ankle instability?
It's a long-term problem marked by repeated sprains, persistent weakness, or a feeling that the ankle is "giving out." Some studies estimate it affects up to 20% of patients after an ankle sprain.
How do I know my ankle is ready for sport?
Don't go by pain alone. You need adequate strength, range of motion, and neuromuscular control to return to full performance and reduce your risk of reinjury.
References
Martin, R.L., Davenport, T.E., Paulseth, S., Wukich, D.K., Godges, J.J. Ankle Stability and Movement Coordination Impairments: Ankle Ligament Sprains. Journal of Orthopedic and Sports Physical Therapy. J Orthop Sports Phys Ther 2013;43(9):A1-A40. doi:10.2519/jospt.2013.0305
Al-Mohrej OA, Al-Kenani NS. Chronic ankle instability: Current perspectives. Avicenna J Med. 2016;6(4):103–108. doi:10.4103/2231-0770.191446
