What helps against chronic ankle instability?

Photo of a man's feet walking through autumn leaves

Strength and coordination exercises help in the treatment of chronic ankle instability. But surgery is sometimes a good idea too. People who already start rehabilitation exercises two to three weeks after surgery will probably become active again sooner than people who only start later on.

People who have a sprained ankle might develop chronic ankle instability. It is considered to be chronic if the ankle joint still gives way too easily six months after the first sprain, or if the ankle is sprained again within six months of the first sprain. Unstable ankle joints can easily be twisted again. The joint remains unstable in about 10 to 20 out of 100 people who have a severe ankle sprain.

This kind of instability can develop if the ankle ligaments are overstretched or torn, and grow back together too loosely (mechanical instability).

The interactions between the bones in the ankle and the surrounding ligaments and muscles may have changed too. Our bodies have an awareness of their own movement and location, known as proprioception. This also helps to coordinate the movements of the joints, stabilize them using reflexes, and keep the body balanced. So if an ankle feels permanently unstable, this might not only be caused by overstretched ligaments, but also by a problem with proprioception or resulting problems with muscle coordination.

What are the treatment options?

There are various treatment options for chronic ankle instability. Conservative treatment is tried first. This involves doing physical therapy (physiotherapy) to strengthen the joint, and possibly wearing a removable ankle brace or splint to stabilize it.

Common forms of physical therapy include neuromuscular training and proprioceptive training. The two kinds of training are similar. They are both designed to improve strength, stability, balance and coordination in the ankle joint. The exercises include, for example, foot movements, standing on one leg, weight shifts, and strength training. Research has shown that neuromuscular training can actually improve the stability and the movement of the ankle in the first few weeks. Experts recommend doing the exercises three of four times a week for about 20 to 30 minutes – for a period of at least 4 to 6 weeks. This can also reduce the risk of spraining the ankle again.

If the joint remains unstable despite this training because the ligaments are too loose, surgery may be considered. One option is to shorten and tighten the ankle ligaments. Another option is to take a tendon out of the lower leg and use it as an outer ligament on the ankle. Tendons and ligaments are made from similar tissue.

How can you get fit again after surgery?

This instability often affects muscle coordination. For this reason, exercises are always an important part of rehabilitation after surgery. Wearing an ankle brace during this time also helps. It provides external support for the joint. The pressure it puts on the joint can help you to regain a good sense of muscle coordination too.

People probably benefit from starting movement, strength and coordination exercises two to three weeks after surgery at the latest. These exercises can also be learned as part of a medically prescribed physical therapy program. Studies suggest that people who do this become active again sooner than those keep their foot still for six weeks and don't do any exercises during that time. The study participants who had started doing exercises and strength training earlier were able to go back to work about one to two weeks sooner. They were also able to do sports again about three weeks sooner. But there were no advantages after about two years: The stability and flexibility of participants' ankle joints was the same in both groups.

De Vries JS, Krips R, Sierevelt IN et al. Interventions for treating chronic ankle instability. Cochrane Database Syst Rev 2011; (8): CD004124.

Tang F, Xiang M, Yin S et al. Meta-analysis of the dosage of balance training on ankle function and dynamic balance ability in patients with chronic ankle instability. BMC Musculoskelet Disord 2024; 25(1): 689.

Vuurberg G, Hoorntje A, Wink LM et al. Diagnosis, treatment and prevention of ankle sprains: update of an evidence-based clinical guideline. Br J Sports Med 2018; 52(15): 956.

Wang F, Guan Y, Bamber Z et al. Preventive interventions for lateral ankle sprains: A systematic review and meta-analysis. Clin Rehabil 2023; 37(5): 585–602.

Yin Y, Wang J, Lin Q et al. Effect of proprioceptive neuromuscular facilitation on patients with chronic ankle instability: A systematic review and meta-analysis. PLoS One 2025; 20(1): e0311355.

IQWiG health information is written with the aim of helping people understand the advantages and disadvantages of the main treatment options and health care services.

Because IQWiG is a German institute, some of the information provided here is specific to the German health care system. The suitability of any of the described options in an individual case can be determined by talking to a doctor. informedhealth.org can provide support for talks with doctors and other medical professionals, but cannot replace them. We do not offer individual consultations.

Our information is based on the results of good-quality studies. It is written by a team of health care professionals, scientists and editors, and reviewed by external experts. You can find a detailed description of how our health information is produced and updated in our methods.

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Updated on June 17, 2026

Next planned update: 2029

Publisher:

Institute for Quality and Efficiency in Health Care (IQWiG, Germany)

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