Etiology — what causes it
Mechanical overload of a joint ligament beyond its yield point. Mechanism varies by joint — inversion for lateral ankle, valgus for MCL, hyperextension for finger PIP collateral. Graded I–II–III based on extent of tearing and resulting laxity.
Epidemiology — who gets it
Among the most common athletic injuries. Lateral ankle is by far the most common; MCL knee, finger PIP, and AC joint sprains are also frequent in sport.
Clinical signs
Joint-specific stress testing, palpation tenderness, swelling, and assessment of laxity vs symmetric side. Imaging in selected cases to rule out fracture or assess higher-grade injury.
Symptoms
Sudden pain at the injury site, swelling, sometimes bruising, difficulty using the joint. Mechanical symptoms in higher-grade injuries.
Best evidence for chiropractic treatment
Early protected mobilization rather than prolonged immobilization, graded loading, proprioceptive training, and progressive return to sport-specific demands. Bracing during return to sport reduces recurrence in selected cases (e.g., lateral ankle).
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
Most acute ligamentous sprains heal well with graded loading and proprioceptive work. Prolonged immobilization is out — controlled movement is in.