What it is

An AC joint sprain is an injury to the ligaments between the clavicle and acromion. It follows a fall onto the shoulder or a direct blow. Sprains range from mild to severe, with visible step deformity in higher grades.

Most recover with protection and staged rehabilitation. Surgery is reserved for high-grade injuries or persistent symptoms that do not respond to conservative treatment.

What happens when it occurs

Ligaments are strained or torn. Swelling and pain limit elevation and pressing. Protection and gradual loading restore stability and strength.

Common causes and risk factors

  • Falls in cycling and field sports
  • Direct blows in contact codes
  • Heavy pressing in the gym without a gradual buildup

Who is most affected

Field and court athletes, cyclists, and tradespeople with overhead tasks.

Typical symptoms

  • Point tenderness over the AC joint
  • Pain with cross-body reach and pressing
  • Visible step in higher grades

When to seek care

Immediate care after a heavy fall. Ongoing review if pain persists or deformity is marked.

How we diagnose

Clinical tests and X-rays with comparison views, in some cases. Grading guides management.

Management

  • Short period in a sling for comfort
  • Range exercises within tolerance
  • Strength for the cuff and scapula, then pressing progressions
  • Surgical reconstruction for selected high-grade injuries

Rehabilitation milestones

Phase 1 weeks 0 to 2: pain control, sling for comfort, gentle range.

Phase 2 weeks 2 to 6: range restoration, light strength, avoid heavy pressing.

Phase 3 weeks 6 to 12: progressive strength, return to work drills.

Phase 4 months 3 to 6: pressing, contact skills, and sport testing.

Readiness to progress

  • Pain trended down during pressing and cross-body reach
  • Strength symmetry within 90 per cent
  • Confidence in contact drills without the next day increase

Prevention

  • Progress, pressing volume and angles carefully
  • Protect the shoulder during falls where possible
  • Keep the cuff and scapula strong year-round

Australia snapshot

  • Common in football codes and cycling incidents
  • Most managed without surgery
  • Public and private services provide imaging and rehabilitation

Latest insights

Graded exposure to pressing restores trust in the joint.

Most AC sprains do not require surgery when rehabilitation is appropriately performed.

Frequently Asked Questions

Use it for comfort in the first days. Begin gentle range as pain allows.

Start with light pulls and presses in friendly angles. Increase load as pain allows.

The step often remains in higher grades, but pain and function improve.

Yes, after strength, range, and contact skills testing.

Only for high-grade injuries or persistent pain and instability.

On the opposite side, with the arm supported.