Etiology — what causes it

Inversion injury most commonly damaging the anterior talofibular ligament (ATFL) and sometimes the calcaneofibular ligament (CFL). Posterior talofibular ligament is rarely injured. Predisposing factors include prior sprain, reduced proprioception, and certain footwear.

Epidemiology — who gets it

Most common athletic injury — incidence roughly 7 per 1,000 person-years in sport. Up to 70% of sprained ankles develop chronic ankle instability or recurrent sprains (Hertel, J Athl Train).

Clinical signs

Anterior drawer test, talar tilt, ATFL palpation tenderness, swelling. Ottawa Ankle Rules to assess need for X-ray (high sensitivity for clinically significant fracture).

Symptoms

Lateral ankle pain after inversion injury, swelling, bruising, difficulty weight-bearing. Mechanical symptoms (giving way) in chronic cases.

Best evidence for chiropractic treatment

JOSPT 2021 CPG (Martin et al.) supports early mobilization (not prolonged immobilization), early functional rehabilitation including proprioceptive training (wobble boards, balance work), and progressive loading. Bracing reduces recurrence in the short term. Surgery is rare for acute sprains and reserved for chronic ankle instability failing structured conservative care.

Subtypes

  • Grade I. Stretching of ATFL; no laxity, minimal swelling.
  • Grade II. Partial tear; mild laxity, moderate swelling and bruising.
  • Grade III. Complete tear; significant laxity, marked swelling and inability to weight-bear.

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

Early mobilization and proprioceptive training are the cornerstones. Casting and prolonged rest are out — movement, balance, and progressive loading move ankles forward.