Why Recurrent Ankle Sprains Happen and How to Stop Them

A single ankle sprain roughly doubles the odds of spraining that same ankle again, and about one in five people who suffer an acute ankle sprain go on to develop chronic ankle instability, a pattern of repeated giving way and recurrent injury that can persist for years or even decades.¹ The reason is not simply bad luck or weak ankles. The first sprain sets off a cascade of structural, neurological, and biomechanical changes that, if left unaddressed, essentially prime the ankle for another injury.

Why a Sprained Ankle Keeps Spraining

The lateral ankle ligaments, particularly the anterior talofibular ligament (ATFL), are the structures most commonly torn in an inversion sprain. When they heal, they often heal in a lengthened or scarred state, leaving the joint mechanically looser than before. That looseness alone can allow the talus bone to shift more than it should during activities like cutting, jumping, or simply walking on uneven ground. But mechanical laxity is only part of the story.

Alongside the structural damage, the injury disrupts the nerve receptors embedded in the ligament tissue. These receptors are responsible for telling your brain exactly where your ankle is in space. When they are damaged, your brain receives slower or less accurate information about ankle position, and the reflexive muscle contractions that would normally prevent your ankle from rolling inward arrive too late or not at all. Researchers have found that people with chronic ankle instability have measurably less accurate position sense, particularly near the end range of inversion, which is exactly the vulnerable position that precedes a sprain.² That same study also found lower eversion muscle strength in the instability group, meaning the muscles that actively resist the ankle rolling inward were weaker as well.

This creates a feedback loop. The loose joint is harder to control, the sensory system sends poorer signals, the protective muscles respond inadequately, and the ankle gives way again, potentially stretching the ligaments even further. Each new sprain can deepen every layer of the problem.

How Gait Changes After Repeated Sprains

People with chronic ankle instability do not walk or run the way people with healthy ankles do, and the differences are visible in motion-capture research. Compared to people who sprained their ankle once and recovered fully, the chronic instability group tends to land with the ankle tilted more toward inversion and with reduced dorsiflexion during both walking and jogging.³ In plain terms, the foot meets the ground already tilted toward the “danger zone” rather than in a neutral or slightly outward-tilted position.

Running makes this pattern even more concerning. One study of female runners found that those with chronic instability contacted the ground with roughly six degrees of ankle inversion, while those who had recovered from a previous sprain actually landed in a few degrees of eversion. That difference, about nine degrees at initial contact, is substantial when you consider how quickly force builds during a running stride.⁴ Landing inverted during the swing-to-stance transition puts the ankle in an open-packed position where the bones are least congruent and ligaments bear the most stress.

These gait deviations are not something people choose or are aware of. They reflect unconscious motor strategies that develop after injury. Some researchers have also observed that the neuromuscular system in people with chronic instability adapts differently to repeated challenges. In healthy individuals, the co-contraction between the muscles on opposite sides of the ankle decreases with practice as the nervous system becomes more efficient. In people with chronic instability, that normal adaptation does not occur, suggesting the nervous system remains in a kind of guarded, inefficient state.⁵

The Osteoarthritis Risk Nobody Talks About

Most people think of a sprained ankle as a short-term nuisance. What tends to get overlooked is that repeated sprains can lead to permanent joint damage. Up to about 80% of ankle osteoarthritis is post-traumatic, meaning it develops after injury rather than from aging or wear-and-tear alone. Histories of single and recurrent ankle sprains are among the most common causes.⁶

The mechanism is straightforward. Each time the ankle gives way, the joint surfaces can slam together abnormally, creating small areas of cartilage damage called chondral lesions. Over time, these accumulate. Research using arthroscopy in patients with prolonged lateral ankle instability has confirmed that patient age, the degree of talar tilt, and the alignment of the ankle are all risk factors for severe cartilage damage.⁷ In other words, the longer instability persists untreated and the more the ankle tilts during episodes, the worse the eventual cartilage destruction.

This is a genuinely important point for anyone who has been brushing off recurring sprains. Unlike ligaments, cartilage does not heal well on its own, and once enough of it is gone, you are looking at degenerative arthritis in a weight-bearing joint. The ankle does not get the surgical replacement options that the hip and knee do, so prevention matters enormously here.

What Actually Works for Rehabilitation

The good news is that the recurrent-sprain cycle responds well to targeted rehabilitation, and you do not necessarily need expensive equipment to get started. The evidence points to a few key pillars.

Balance and Neuromuscular Training

Balance training is the single most studied and consistently supported intervention for reducing recurrent ankle sprains. It retrains the proprioceptive system, rebuilds the reflexive muscle patterns that protect the ankle, and has been shown to be effective both for preventing first-time sprains in at-risk athletes and for reducing recurrence in people who have already been injured.⁸ That study found that while both resistance training and balance training improved strength and dynamic balance, balance training also produced better results on functional hop tests and on patient-reported measures of pain, sports participation, and quality of life.

Practical balance exercises start simple: standing on one foot with eyes open, progressing to eyes closed, then to unstable surfaces like a foam pad or wobble board. From there, sport-specific progressions add cutting, hopping, and reactive movements. The key is consistency over weeks, not intensity in a single session.

Joint Mobilization and Dorsiflexion Recovery

Restricted dorsiflexion is a hallmark of chronic ankle instability. When the ankle cannot flex upward adequately, the body compensates in ways that increase inversion stress. Manual therapy techniques targeting the posterior glide of the talus have shown measurable improvements in range of motion, dynamic balance, and self-reported function. A randomized controlled trial found that joint mobilization produced improvements in dorsiflexion range of motion and balance measures that persisted at six months of follow-up.⁹ Separate research confirmed that both ankle joint mobilization and calf soft tissue massage can produce immediate gains in dorsiflexion.¹⁰

A two-week course of joint mobilizations targeting posterior talar glide also improved self-reported function and reach distances in all directions of a standard balance test, and those improvements lasted at least one week after the treatment period ended.¹¹ Mobilization is typically performed by a physiotherapist, but self-mobilization techniques with a resistance band can supplement clinic visits.

When Surgery Becomes the Conversation

Surgery is generally reserved for people who have tried thorough rehabilitation for several months and still experience instability. The most common procedure is the modified Broström repair, which tightens and reattaches the stretched or torn lateral ligaments using the body’s own tissue. This approach carries a success rate in the range of 85% to 95% and preserves normal ankle and subtalar motion, which means a quicker return to function and less stiffness than more invasive alternatives.¹²

The alternative category involves reconstructing the ligaments using tendon grafts, either from the patient’s own body or from donor tissue. These procedures are typically reserved for revision cases, very large patients, or situations where the native ligament tissue is too degraded to repair. While graft reconstructions can provide a stronger initial construct, they come with trade-offs: more stiffness, longer recovery, greater risk of nerve injury, and gait patterns that deviate more from normal than those seen after Broström repair.¹³

One thing worth knowing: surgical success still depends heavily on post-operative rehabilitation. The surgery addresses the mechanical looseness, but the proprioceptive and neuromuscular deficits still need to be retrained afterward.

The Subtalar Joint Problem

If you have been doing all the right rehabilitation work and still cannot shake the feeling of instability, the problem might not be where you think it is. The subtalar joint, which sits below the true ankle joint and is responsible for the side-to-side rocking motion of the hindfoot, can also become unstable after inversion injuries. Most subtalar ligament injuries occur alongside damage to the ankle joint above, so they are easy to miss on initial evaluation. Patients with subtalar instability typically report the same giving-way symptoms and recurrent sprain history as those with standard ankle instability, which makes clinical differentiation difficult.¹⁴

If standard ankle rehabilitation is not producing results, it is worth asking a clinician to evaluate the subtalar joint specifically, as the treatment approach can differ.

Do High-Top Shoes Actually Help?

The belief that high-top shoes prevent ankle sprains is deeply ingrained, particularly in basketball culture. The evidence is more nuanced than most people expect. A lab study found that high-top shoes reduced the amount and rate of ankle inversion compared to low-tops under controlled loading conditions, cutting inversion displacement by about four and a half degrees.¹⁵ That sounds promising, but when researchers tracked basketball players during an actual season, the injury rates between high-tops, low-tops, and high-tops with inflatable air chambers were not significantly different.¹⁶

The disconnect likely comes from the difference between controlled lab forces and the chaotic, unpredictable forces of real sport. A shoe collar can slow down ankle inversion, but during a high-speed cut or an awkward landing on another player’s foot, the forces involved overwhelm what any shoe can provide. External ankle braces, particularly semi-rigid or lace-up designs, have a stronger evidence base for reducing recurrence in people with a history of sprains. The combination of external support and neuromuscular training appears to be more effective than either alone.

The Foot Muscles You Have Probably Never Thought About

An emerging area of research looks at the small intrinsic muscles of the foot, the ones that control toe spread, arch stiffness, and fine adjustments of foot position during weight bearing. In people with chronic ankle instability, the activity of one of these muscles, the abductor digiti minimi on the outer edge of the foot, is reduced during landing tasks. Lower scores on ankle instability questionnaires correlated with less activity in that muscle, suggesting it plays a role in dynamic ankle stability that has been underappreciated.¹⁷

Another study in young handball players found structural differences in the intrinsic foot muscles of those with chronic instability compared to healthy controls, with measurable differences in the size of muscles like the abductor hallucis and the flexor hallucis brevis.¹⁸ Whether these differences are a cause or a consequence of instability is still being worked out, but strengthening the foot’s intrinsic musculature with exercises like towel curls, short-foot exercises, and barefoot balance work is increasingly being integrated into rehabilitation programs.

Returning to Sport Without Re-Spraining

One reason recurrence rates stay so high is that many people return to sport before their ankle is actually ready. The frustrating reality is that pain resolution is not the same as functional recovery. Your ankle can feel fine during daily life but still lack the strength, reaction speed, and proprioceptive accuracy to handle the demands of cutting, jumping, and rapid direction changes.

An international consensus panel developed a framework called PAASS for guiding return-to-sport decisions after lateral ankle sprains. It maps sixteen assessment items across five domains:¹⁹

Pain: during sport and in the 24 hours following activity
Ankle impairments: range of motion, muscle strength, endurance, and power
Athlete perception: confidence in the ankle, perceived stability, and psychological readiness
Sensorimotor control: proprioception and dynamic balance
Sport/functional performance: hopping, jumping, agility drills, sport-specific movements, and the ability to complete a full training session

Notably, the psychological dimension is part of the formal framework. Fear of re-injury and lack of confidence in the ankle are real barriers to safe return, not just in the head but in how they alter movement patterns. An athlete who does not trust their ankle tends to stiffen up and avoid loading it symmetrically, which can paradoxically increase injury risk.²⁰ Despite the existence of frameworks like PAASS, a systematic review found that no published studies had actually used a formal criteria-based return-to-sport process for lateral ankle sprain patients, indicating a significant gap between what experts recommend and what happens in practice.²¹

Adolescents and Growing Ankles

Recurrent ankle sprains are not just an adult problem. In pediatric and adolescent populations, ankle sprains dominate the literature on low-energy lateral ankle injuries, largely because of their high recurrence rate in this age group.²² One complicating factor in adolescents is that the growth plates near the ankle are still open, which can make it harder to distinguish a sprain from a growth plate fracture on initial evaluation. A missed growth plate injury treated as a simple sprain can lead to ongoing problems.

The rehabilitation principles are the same for adolescents as for adults: restore range of motion, rebuild proprioception through balance training, strengthen the eversion muscles, and progress through sport-specific tasks before returning to full activity. What differs is that younger patients are often less compliant with exercise programs and more eager to return to play, which sets them up for the same recurrence cycle. Parents and coaches play an outsized role in ensuring rehabilitation is actually completed rather than abandoned once the pain fades.