Physiotherapy and balance training after an ankle sprain: what the evidence shows

Why so many sprains come back

An ankle sprain feels like a one-off. You roll the ankle, it swells, it hurts for a week or two, and then most of the pain fades and life moves on. The trouble is that, for a large share of people, the story does not actually end there. Studies of ankle-sprain outcomes find that recurrence is common — depending on the sport and population, somewhere between 12% and 47% of all reported sprains are re-injuries rather than first-time events — and that having sprained an ankle once is itself one of the strongest predictors of spraining it again [1]. In one analysis of military cadets, a prior sprain was associated with roughly 3.5 times the risk of a subsequent sprain compared with people who had never sprained that ankle [1].

That pattern is why rehabilitation after a sprain is worth taking seriously even when the injury feels minor. This piece summarises what the research says about physiotherapy-style rehabilitation — especially balance and neuromuscular ("proprioceptive") training — for reducing recurrent sprains and the longer-term problem of chronic ankle instability. The aim is not to tell you what to do; it is to lay out the evidence, with its real effect sizes and its real limitations, so you can have a sharper conversation with a regulated clinician.

What "chronic ankle instability" actually means

When a sprained ankle does not fully settle, the result clinicians describe is chronic ankle instability (CAI): a pattern of laxity and mechanical instability that interferes with activity, often accompanied by repeated episodes of the ankle "giving way," lingering feelings of unsteadiness, and further sprains [1]. It is thought to arise from a mix of physical changes — stretched or incompletely healed ligaments — and changes in the way the ankle senses position and reacts, the sensory-motor system that balance training targets.

CAI is common enough after a sprain to be a central concern rather than a rare complication. A synthesis of the epidemiology reports that up to 70% of people who sustain an acute lateral ankle sprain may go on to develop some features of CAI, and one prospective study found a 40% prevalence of CAI one year after a first-time sprain [1]. Those figures vary with how CAI is defined and measured, and the literature is candid that the definition itself is contested — but the headline is consistent: a meaningful fraction of sprains leave lasting deficits [1].

What the evidence shows for balance and neuromuscular training

The best-studied strategy for reducing repeat sprains is progressive balance and neuromuscular training — wobble-board work, single-leg balance drills, and controlled hop-and-land exercises that retrain the ankle's coordination and reaction.

A systematic review and meta-analysis by Schiftan and colleagues pooled seven moderate-to-high-quality randomised trials involving 3,726 participants from sporting populations [2]. For people with a previous ankle sprain, proprioceptive training significantly reduced the rate of subsequent sprains, with a relative risk of 0.64 (95% CI 0.51 to 0.81) — roughly a one-third reduction in recurrence [2]. A separate evidence-based review by Rivera and colleagues, drawing on the same body of trials, reported a very similar recurrence figure (RR 0.64, 95% CI 0.51 to 0.81) and translated it into a number-needed-to-treat of 13: about 13 people with a prior sprain would need to complete a training programme to prevent one additional sprain [3]. Pooled across all participants regardless of history, that review put the overall relative risk at 0.65 (95% CI 0.55 to 0.77), a 35% reduction, with a number-needed-to-treat of 17 [3].

The signal for recurrence — secondary prevention in people who have already been injured — is therefore reasonably consistent and points in a favourable direction of moderate size. The signal for primary prevention, in people with no history of sprain, is weaker. Schiftan's subgroup for participants without a prior sprain did reach statistical significance (RR 0.57, 95% CI 0.34 to 0.97), but the authors noted this pooled estimate came from two trials that were each individually non-significant, and they concluded that the evidence for primary prevention remains inconclusive [2]. Rivera's review reached the same place, reporting the widest confidence interval and the largest number-needed-to-treat (33) for the no-history group and cautioning that this estimate should be interpreted carefully [3]. In plain terms: the benefit is best supported in athletes and in people who have already sprained an ankle, and is least certain as a general injury-prevention measure for the previously uninjured.

Two limitations travel with these numbers and should not be dropped. First, the trials were conducted almost entirely in sporting populations — often younger, active people — so the estimates may not transfer cleanly to a sedentary adult or an older person after a household stumble. Second, the training programmes themselves were not standardised across trials; they varied in duration, frequency, and exercise type, which makes it hard to specify an exact "dose" from the evidence alone [3].

Early functional rehabilitation and bracing

Balance training is one piece of a broader rehabilitation approach. Two other threads in the evidence are worth summarising honestly.

The first is early functional treatment — controlled movement, progressive weight-bearing, and supported activity rather than prolonged rigid immobilisation after an acute sprain. This idea has broad clinical acceptance, but the evidence base has a notable wrinkle: the widely cited Cochrane review that originally compared immobilisation with functional treatment was formally withdrawn in 2013 because it had become substantially out of date, so it can no longer be read as a current source [6]. That does not make early functional care wrong — contemporary clinical guidelines continue to support it (below) — but it is a reason to lean on newer guideline syntheses rather than the older headline finding.

The second is external support — bracing or taping. Here one comparative trial is directly informative. Janssen and colleagues ran a three-arm randomised controlled trial in 384 athletes (aged 18 to 70) who had recently sprained an ankle, comparing an eight-week neuromuscular training programme, a semi-rigid brace worn during sport for a year, and the two combined [5]. Over 12 months, self-reported recurrence was 27% in the training group, 15% in the brace group, and 19% in the combined group; the brace group had a significantly lower recurrence rate than training alone (relative risk 0.53, 95% CI 0.29 to 0.97), while the combined group's advantage over training did not reach significance (RR 0.71, 95% CI 0.41 to 1.23) [5]. The authors' conclusion was specific: bracing was superior to neuromuscular training for reducing the incidence — but not the severity — of self-reported recurrent sprains after usual care [5].

That single trial is a useful counterweight to the assumption that exercise is automatically the strongest option, but it should be read as one study's finding in one athletic population over one year, not as a universal ranking. Bracing and training are often framed as complementary rather than competing — external support during high-risk activity while the ankle's own control is retrained — and the trial's combined arm still cut recurrence substantially relative to training alone [5].

Limitations worth taking seriously

Several features of this literature should keep everyone's confidence measured:

• Population. The strongest evidence comes from athletes and physically active people. Effect sizes derived from sporting cohorts may overstate — or simply not describe — what happens in non-athletic or older adults [2][3].
• Prior injury matters. Benefit is clearest for recurrence in people who have already been injured; primary prevention in the never-injured rests on thin, individually non-significant trials [2][3].
• Unstandardised programmes. "Balance training" and "neuromuscular training" span many protocols at different doses, so the trials do not pin down an exact prescription [3].
• Outcome measurement. Much of the recurrence data is self-reported, and definitions of chronic ankle instability differ between studies, which widens the uncertainty around any single number [1][5].
• Aging or withdrawn evidence. Some foundational syntheses — including the original Cochrane immobilisation-versus-function review — are now withdrawn or superseded, so current guidance rests on newer sources [6].

What the guidelines conclude

The most authoritative synthesis is the 2021 revision of the clinical practice guideline on lateral ankle ligament sprains published in the Journal of Orthopaedic & Sports Physical Therapy by the Academy of Orthopaedic Physical Therapy [4]. It deliberately addresses both first-time sprains and established chronic ankle instability, and it makes recommendations aimed at preventing both first-time and recurrent injury, alongside recommendations for treating acute, post-acute, and chronically unstable ankles [4]. In broad strokes, the guideline supports exercise-based rehabilitation — including balance and coordination training — as part of managing sprains and reducing the risk of recurrence, and supports supported, progressive return to activity rather than prolonged rest [4]. For the specific graded strength of each recommendation, the full guideline is the primary reference and is cited below.

What this means for you

Put together, the evidence supports a measured, encouraging summary rather than a promise. After an ankle sprain — particularly if you are active or have sprained the ankle before — structured balance and neuromuscular training is the best-supported way we currently have to lower the odds of another sprain, with meta-analyses pointing to roughly a one-third reduction in recurrence in sporting populations [2][3]. External support such as bracing has its own supportive evidence, and in at least one head-to-head trial it reduced recurrences at least as much as training did [5]. At the same time, most of this evidence comes from athletes, the benefit for preventing a first sprain is uncertain, the exact training recipe is not standardised, and none of these measures is a guarantee against re-injury [2][3][5].

What the research averages cannot do is tell you how badly your ankle was injured, whether ligaments or other structures are involved, how much loading is safe right now, or how to build and progress a programme around your work, sport, and history. Those are judgements that require a hands-on assessment by a licensed, regulated health professional — a physiotherapist, physician, or comparable clinician — who can examine your ankle directly, confirm what is going on, and tailor and adjust a plan for you. Use this summary to ask better questions; let a qualified professional individualise the care.