AC Joint Sprains: Recovering from a Fall on the Shoulder

You put your arm out, or maybe you didn't have time to, and now there's a sharp, specific pain sitting right at the top of your shoulder, exactly where your collarbone meets your shoulder blade.

That's usually the sign of an AC joint sprain, one of the most common injuries we see at Vital Performance Care after a fall, a bike accident, or a hard hit in contact sports.

AC joint injury physiotherapy focuses on exactly that spot, and the good news is that most of these injuries respond well to the right approach.

As we tell our patients early on, this heals with time and gentle, controlled movement, so let's walk through what's actually happening in your shoulder and how recovery unfolds.

What Is an AC Joint Sprain?

Your acromioclavicular, or AC, joint is where your collarbone meets the tip of your shoulder blade. It's held together by a set of ligaments that keep the joint stable during everyday movement and impact.

A fall directly onto the shoulder, or onto an outstretched hand that transmits force upward, can stretch or tear those ligaments, which is what produces that specific point of tenderness right at the top of the shoulder. You can get a complete shoulder rehab with our shoulder foundation program. 

Understanding the Grades of AC Joint Sprains

Not all AC joint sprains are the same, and knowing the difference helps explain why your recovery plan looks the way it does.

• Grade I involves mild stretching of the ligaments with no visible deformity. Pain is usually manageable, and movement is only mildly restricted.
• Grade II involves a partial tear, often with a small, noticeable bump at the joint and more pronounced pain with overhead or cross-body movement.
• Grade III involves a complete tear of the main supporting ligaments, creating a more visible step deformity at the shoulder. Most Grade III sprains still heal well with physiotherapy, though a small number are referred for a surgical opinion depending on activity demands.
• Grades IV to VI are rare and involve more significant displacement of the collarbone. These typically require a surgeon's assessment before physiotherapy becomes the main focus.

The vast majority of AC joint sprains we see fall into Grades I through III, and nearly all of them recover well without surgery.

AC Joint Injury Physiotherapy: What Treatment Looks Like

Good AC joint injury physiotherapy moves through four broad stages, each building on the one before it, rather than throwing every treatment at the joint all at once.

Pain Management

The first priority is simply making the joint comfortable enough to function day to day.

This usually means a short period of sling support for comfort, activity modification to avoid movements that provoke sharp pain, such as reaching across the body or overhead, and protective taping that offloads stress from the healing ligaments while still letting you move your arm through daily tasks.

Inflammation Management

Alongside pain control, the early days focus on calming the acute inflammatory response at the joint.

Ice application, applied on a regular schedule rather than just when it hurts, helps limit swelling in that first week. Gentle soft tissue work also comes in here, easing the surrounding muscles that tend to tighten up as they guard the injured joint, which in turn helps swelling and discomfort settle faster.

Mobility and Range of Motion

Once acute pain and swelling are under control, the focus shifts to restoring motion without loading the joint itself.

Pendulum exercises are typically the starting point, since gravity does the work of moving your arm while your muscles stay relaxed.

From there, gentle active-assisted movement is added gradually, expanding your range as tolerated without forcing through pain.

Strengthening and Return to Function

The final stage rebuilds the muscular support system around the joint. Isometric flexion and abduction exercises are usually introduced first, letting you activate your shoulder muscles safely before adding any dynamic movement.

From there, deltoid and scapular strengthening takes over, and this is often the phase that makes the biggest practical difference, since strong scapular control is what lets you return to lifting, sport, or overhead work with confidence.

What to Expect During Recovery

Timelines vary by grade, but a general pattern holds true across most AC joint sprains. The table below gives a general sense of how recovery tends to unfold, though your physiotherapist will adjust these timelines based on how your joint responds.

Grade	Initial Protection Phase	Mobility & Light Activity	Return to Full Activity or Sport
Grade I	3 to 5 days	1 to 2 weeks	2 to 4 weeks
Grade II	1 to 2 weeks	3 to 4 weeks	4 to 6 weeks
Grade III	2 to 3 weeks	5 to 6 weeks	8 to 12 weeks
Grades IV to VI	Surgeon-directed	Guided by surgical protocol	Often 4 to 6 months

These ranges are general guideposts rather than guarantees. Your age, activity level, and how closely you follow your rehab program all influence where you fall within, or even outside, these windows.

Getting Back to Full Activity Safely

The biggest mistake we see is returning to contact sports or heavy lifting the moment pain disappears, before the joint has actually regained its strength and stability. A few things help protect you on the way back:

• Confirm full, pain-free range of motion before adding load or resistance.
• Rebuild scapular and deltoid strength before returning to overhead or contact activities.
• Use protective taping or padding during the early return-to-sport phase, especially for contact sports.
• Progress gradually rather than jumping straight back into pre-injury training volume.

Move Forward With Confidence

An AC joint sprain can feel alarming in the moment, especially with that visible bump some people notice, but the outlook for a full recovery is genuinely good for most people.

At Vital Performance Care in Calgary, our physiotherapy team builds a recovery plan around your specific grade of injury and your goals, whether that's getting back to sport, work, or simply reaching overhead without pain again.

Reach out to book an assessment and let's get your shoulder back to full strength.