AC Joint Pain – Acromioclavicular Joint Sprain

AC joint pain physiotherapy assessing acromioclavicular joint after shoulder separation — AC joint assessment checks pain, alignment and function.

AC joint pain physiotherapy can help if the top of your shoulder feels sore, sharp, swollen, or unstable after a fall, tackle, bike crash, or heavy lifting. An AC joint sprain is often called a shoulder separation. It is different from a shoulder dislocation.

This guide explains what the acromioclavicular joint does, how injuries happen, when to get checked, and what rehabilitation often involves. It also outlines recovery checkpoints for work, gym, and sport.

Quick Guide: AC Joint Pain

Common cause: a fall or direct impact onto the point of the shoulder.
Common symptom: pain at the end of the collarbone.
Key movement: pain reaching across the body, pressing, or lifting overhead.
Next step: get assessed if pain is severe, unstable, or not settling.

If your symptoms spread beyond the top of the shoulder, read our shoulder pain guide. Related shoulder conditions include rotator cuff tear, shoulder bursitis, shoulder impingement, and sports injuries.

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When Should You Get AC Joint Pain Checked Urgently?

Get medical or physiotherapy advice sooner if the injury followed a fall, collision, or heavy impact. This is more important when pain is severe or the shoulder shape has changed.

Severe pain after a fall, tackle, or bike crash
Obvious deformity, a large “step”, or rapid swelling
Numbness, tingling, or weakness down the arm
Inability to lift the arm at all
Concern for fracture or dislocation

What Is the AC Joint?

The AC joint sits at the top of your shoulder, where the clavicle, or collarbone, meets the acromion, which is part of the shoulder blade. It helps your arm move overhead and across your body. It also transfers force from your arm into your trunk.

Several ligaments support the joint. If they stretch or tear, the joint can become painful or unstable. A higher-grade injury may create a visible bump on the top of the shoulder.

How Do AC Joint Injuries Happen?

Most AC joint sprains happen after a direct blow to the point of the shoulder. Common examples include a bike crash, a fall onto the side of the shoulder, or a tackle. Another mechanism is falling onto an outstretched hand, where force travels up the arm and stresses the AC joint.

What Are the Common Symptoms of an AC Joint Sprain?

AC joint symptoms usually sit close to the top of the shoulder. They often feel worse with pressing, lifting, cross-body reach, or contact through the shoulder.

Pain at the top of the shoulder
Pain at the end of the collarbone
Pain with lifting, pushing, or pressing
Pain reaching across the body, such as for a seatbelt
Swelling or bruising after trauma
A visible bump or “step” in higher-grade injuries

AC Joint Pain vs Shoulder Dislocation

An AC joint sprain affects the joint between the collarbone and shoulder blade. A shoulder dislocation usually means the ball of the upper arm bone has come out of the shoulder socket.

Both can follow trauma. However, they need different assessment and management plans. If the shoulder looks out of place, feels unstable, or cannot move normally, seek urgent review.

How Are AC Joint Injuries Graded?

Clinicians often describe AC joint injuries by grade, or type. Lower grades usually involve a sprain of the AC ligaments with the joint mostly aligned. Higher grades involve more ligament disruption and can include the coracoclavicular ligaments.

Your symptoms and goals still matter. A small bump can settle well with the right plan. However, some people struggle if they return to heavy pressing, lifting, or contact sport too early.

How Is AC Joint Pain Diagnosed?

A physiotherapist will ask how the injury happened, what movements trigger pain, and what activities you need to return to. The assessment may include shoulder range of motion, strength, cross-body movement, and joint stability checks.

Imaging may help after trauma. X-rays can check alignment and rule out fracture. Your clinician may recommend further imaging if they suspect another shoulder injury, such as a rotator cuff tear or shoulder dislocation.

What Can Physiotherapy Do for AC Joint Pain?

AC joint pain physiotherapy usually follows a staged plan. First, you protect the joint and settle pain. Next, you restore comfortable movement. Then you rebuild shoulder strength and load tolerance for work, gym, or sport.

Your physiotherapist may help with:

Pain management and activity modification
Shoulder and shoulder-blade control drills
Progressive deltoid, rotator cuff, and scapular strengthening
Advice about braces, strapping, and training load
Return-to-work, gym, pressing, and contact sport planning

If you suspect ligament damage, it may also help to read about a ligament tear and how loading often progresses after soft tissue injury.

Early Management You Can Start Today

Early management should reduce irritation without fully stopping safe movement. Stay within comfort and avoid testing the injury repeatedly.

Reduce heavy pressing, dips, push-ups, and overhead lifting for a short period.
Keep gentle shoulder movement going within comfort.
Use ice or heat if it helps your symptoms.
Support the arm if walking or hanging the arm increases pain.
Avoid contact sport until the shoulder is assessed and load tested.

Load Decision: Should You Keep Training?

Green light: gentle movement that settles quickly and does not increase next-day pain.
Amber light: light pulling, rowing, or lower-body training with shoulder support if comfortable.
Red light: heavy pressing, dips, contact drills, or exercises that sharpen top-of-shoulder pain.

Exercises and Strengthening for AC Joint Pain

Most people benefit from targeted shoulder strengthening once the initial pain settles. Start light and progress slowly. Exercise choice should match the injury grade, pain level, work needs, and sport goals.

AC joint sprain rehab with resisted shoulder external rotation exercise — Light resistance helps rebuild shoulder control.

For a safe starting point, see our shoulder exercises page. Progress to gym-based strengthening only when your shoulder tolerates daily activity and light resistance.

How Long Does an AC Joint Sprain Take to Recover?

Recovery time varies. Many mild sprains improve over a few weeks with good load management. Higher-grade injuries often take longer, especially when work involves lifting or sport involves contact, falls, or heavy pressing.

Recovery Stage	Main Goal	Progress Check
Early phase	Settle pain and protect the joint	Less pain with daily movement
Movement phase	Restore shoulder range and control	Comfortable reach and light lifting
Strength phase	Build pressing, pulling, and overhead capacity	Good strength without flare-up
Return phase	Return to work, gym, or sport demands	Task-specific confidence and tolerance

Returning to Gym and Work

Return to lifting works best when you rebuild the basics first. Start with pain-free range, then light resistance, then controlled pressing patterns. Leave max-strength testing until later.

If your job is physical, your plan should include work-specific training. That may include lifting mechanics, overhead tolerance, and endurance work so your shoulder can handle longer shifts.

Returning to Sport After an AC Joint Injury

A staged return can reduce setbacks. Your physiotherapist will usually look for clear checkpoints rather than relying on time alone.

Comfortable full range of motion, or close to full
Good shoulder-blade control under fatigue
Strength close to the uninjured side for key movements
Sport-specific tolerance, such as throwing, tackling prep, falls training, or pressing
Confidence with contact or impact tasks where relevant

For broader support with field and court demands, see sports physiotherapy.

Can a Shoulder Support Help?

Some people find that reducing load across the shoulder girdle helps in the early phase, especially during desk work or light activity. A support is not a stand-alone fix, but it may help you manage irritation while you rebuild strength. Relevant shoulder supports appear in the product section below.

When Is Surgery Considered?

Some higher-grade injuries or persistent instability may need an orthopaedic review. Surgery is not required for everyone. A clinician will weigh injury grade, work demands, sport type, cosmetic concerns, and your symptoms over time.

If surgery occurs, rehabilitation still matters. Post-operative physiotherapy focuses on regaining movement, restoring strength, and progressing back to work or sport in a structured way. You can also read more about post-operative shoulder physiotherapy.

How Can You Reduce Future AC Joint Flare-Ups?

Build shoulder and upper back strength gradually.
Improve shoulder-blade control during pressing and overhead activity.
Increase pressing volume slowly.
Keep contact sport return planned and progressive.
Stop early if pain sharply increases at the top of the shoulder.

AC joint injury rehab progressing controlled shoulder pressing exercise — Return to pressing should progress gradually.

Frequently Asked Questions

What is an AC joint sprain?

An AC joint sprain is an injury to the ligaments at the top of the shoulder, where the collarbone meets the shoulder blade. It is often called a shoulder separation. Severity ranges from mild ligament stretch to higher-grade joint disruption.

How do I know if I need an X-ray for AC joint pain?

An X-ray may be recommended after a significant fall, tackle, bike crash, visible deformity, severe pain, or concern for fracture. A clinician can guide whether imaging is needed based on your symptoms and injury mechanism.

Can physiotherapy help AC joint pain?

Physiotherapy may help by guiding early protection, restoring shoulder movement, and progressing strength and control. The goal is to help the joint tolerate work, gym, and sport loads safely.

How long does an AC joint sprain take to improve?

Recovery depends on injury grade and activity demands. Many mild sprains improve over weeks. Higher-grade injuries may take longer, especially for heavy lifting, overhead work, or contact sport.

When can I return to sport after an AC joint injury?

Return to sport usually follows pain reduction, near-full movement, restored strength, and sport-specific tolerance. Your physiotherapist can test readiness and guide a staged return to reduce setbacks.

What to Do Next

If you suspect an AC joint sprain, book an assessment. A physiotherapist can assess the likely injury grade, screen for other shoulder injuries, and build a plan that matches your sport, work, and timeline goals.