Etiology — what causes it
Combination of mechanical insufficiency (ligamentous laxity after recurrent sprains) and functional insufficiency (proprioceptive deficits, delayed peroneal reaction time, altered neuromuscular control). Both contribute to the recurrence pattern.
Epidemiology — who gets it
Up to 70% of those with an initial ankle sprain develop some degree of chronic instability (Hertel & Corbett, J Athl Train). More common in athletes who return to sport without completing proprioceptive rehab.
Clinical signs
Anterior drawer and talar tilt may show laxity. Star Excursion Balance Test (SEBT) and Y-Balance Test asymmetries. Single-leg balance deficits. Strength testing of evertors and dorsiflexors.
Symptoms
Recurrent ankle sprains, subjective sense of giving way, fear of certain movements, often on uneven terrain or during cutting. May include persistent pain or swelling.
Best evidence for chiropractic treatment
Balance and reactive control training is the cornerstone (Hertel & Corbett, J Athl Train). Progressive perturbation training, plyometrics, and sport-specific tasks restore function. Bracing during sport reduces recurrence. Surgical stabilization (Brostrom procedure) is appropriate when structured rehab fails.
When to seek emergency care
Some symptoms need urgent medical attention — not a chiropractic visit. Call 911 or go to the nearest emergency department for: progressive limb weakness, loss of bowel or bladder control, saddle anesthesia (numbness in the groin/inner thighs), severe unrelenting pain unrelieved by position, signs of fracture after significant trauma, chest pain, stroke-like symptoms (face drooping, arm weakness, speech changes), or any rapidly worsening or unusual symptom.
Bottom line
Chronic ankle instability is largely a neuromuscular control issue. Balance, reactive training, and progressive loading restore confidence — surgery is for refractory mechanical cases.