Chronic ankle instability

What it is

After an ankle sprain the ligaments heal, often with some residual laxity. What frequently does not recover is the sensory function: the mechanoreceptors in the ligaments that tell the brain where the ankle is, and the speed of the peroneal muscle response that would catch a roll.

The result is an ankle that feels untrustworthy and gives way from progressively smaller provocations. Around forty per cent of people who sprain an ankle end up here, and the reason is almost always the same - rehabilitation stopped when the pain stopped, months before the balance deficit had.

What it feels like

• The ankle giving way on uneven ground, kerbs, grass or in the dark
• A general feeling of not being able to trust it
• Repeated sprains from increasingly trivial things
• Aching after activity, and sometimes a persistent tenderness at the front of the ankle
• Noticeably worse single-leg balance on that side

What causes it

Most people have more than one of these at once, and they feed each other. Read the list looking for the two or three that sound like your week rather than for the one true answer — the ones that describe you are the ones worth acting on.

Lost proprioception

The damaged ligaments carry position sensors. Their loss means the brain is working with worse information, so corrections are late and inaccurate - and this does not recover without specific training.

Delayed peroneal reaction time

The peroneal muscles on the outside of the leg are the active restraint against rolling. Their reaction time is measurably slower after a sprain, and a late correction is the same as no correction.

Rehabilitation stopping at pain resolution

This is the central failure. Pain settles in two to three weeks; the balance deficit lasts six months or more. Almost nobody continues past the first, which is why the second is so common.

Residual ligament laxity

Healed ligaments are often slightly longer and looser than before. This contributes, though it is consistently found to be less important than the sensory and reaction deficits.

Reduced ankle dorsiflexion

Nearly universal after a sprain and rarely addressed. A stiff ankle changes how the foot lands and reduces the margin available to recover from a roll.

Weak hips

Single-leg stability is a hip task as much as an ankle one. Weak glute medius means the whole leg is poorly controlled, and the ankle is left to rescue a situation that started higher up.

Each subsequent sprain

Every episode adds laxity and further degrades the sensing. The threshold falls each time, which is why the interval between sprains shortens.

Reliance on tape and braces

Both work and both are useful, but used indefinitely instead of retraining they let the underlying deficit persist permanently.

Fatigue and poor light

Most giving-way episodes happen late in an activity or in conditions where visual input is reduced - both situations where a poor sensing system has least to fall back on.

Who tends to get it

• Anyone who has sprained the same ankle more than once
• Court and field sport players
• People who never did balance work after their original sprain, which is most people
• Anyone with generalised joint hypermobility
• Older adults, in whom giving way becomes a fall rather than a stumble

What makes it worse, and what settles it

The qFIT routine for this

Ready-made routineAnkle Stability & Sprain Recovery

qFIT already has this one built. It runs massage first, then stretching, then strength — the order that works on a body that is already sore — and every activity in it carries the reason it is there.

The button below opens your Checklist with this routine already selected, so instead of your whole list you land on just its Categories, Targets and Exercises, each with its checkbox, ready to tick as you work through them.

Have more than one problem? Tick yours under My Problems on My Profile and your Checklist's Routine list gains Recommended for my problems — every routine for the problems you picked, merged into one. Your picks stay private; that filter is the only thing they feed.

Get it checked if…

Inability to weight-bear for four steps after a sprain - Ottawa rules, image for fracture

And whatever the body part: chest pain or unusual breathlessness on exertion; a fever alongside the pain; unexplained weight loss; pain that is constant and unrelated to how you move; new numbness, weakness or loss of bladder or bowel control; or one calf that is swollen, warm and painful. Any of those, stop and get assessed.

How it usually goes

Balance training is genuinely effective here - programmes continued for six to twelve weeks substantially reduce recurrence and improve reported stability, and the benefit continues to build with longer training. The one thing that makes it fail is stopping early, which is exactly what happened after the original sprain. Persistent pain, catching, locking or swelling as well as instability suggests something structural inside the joint and is worth having assessed.

Prevalence basis: Sports injury surveillance

Others the same routine covers

These share the Ankle Stability & Sprain Recovery routine, so the work is the same. If one of them also sounds like you, that is a reason to expect more from it, not less.

This is general information, not a diagnosis, and it cannot examine you. If it matches you, use it to ask better questions of a clinician rather than to replace one.