AC Joint Separation Symptoms

The symptoms of a separated shoulder track closely with the grade, which is useful, because it means what a patient notices in the first week says something real about what happened inside the joint. A shoulder that is sore at one specific point is a different injury from one carrying a visible bump, and the difference is which ligaments tore.

What symptoms cannot do is settle the grade on their own, and that is where patients get sent down the wrong path. Steven Struhl, MD has performed more than 200 AC joint reconstructions and sees regularly what happens when a complete separation is read as a mild one from a single X ray. He is board certified in orthopedic surgery and separately in sports medicine and has practiced in New York since 1991.

Early Symptoms After the Injury

In the first hours and days, most separations look broadly similar regardless of grade, which is part of the difficulty.

• Immediate Sharp Pain: pain at the top of the shoulder at the moment of impact.
• Point Tenderness: soreness located precisely over the joint rather than spread across the shoulder.
• Swelling: localized swelling at the top of the shoulder within the first hours.
• Pain With Arm Movement: discomfort lifting the arm or reaching across the body.
• Bruising: discoloration appearing over the following days in higher grade injuries.

Point tenderness is the most useful early clue, and it is what separates this injury from a simple bruise. A separated joint is sore at one precise spot at the top of the shoulder, directly over the joint line, rather than generally sore across the whole area. Pain that reproduces when reaching across the body toward the opposite shoulder points the same direction, since that motion compresses the acromioclavicular joint directly.

The pain is typically worst in the first two to three days and then begins to settle. What happens after that is what distinguishes the grades.

Symptoms of a Mild Separation, Grades 1 and 2

In a grade 1 the ligaments around the joint are stretched. In a grade 2 they tear while the ligaments below hold the collarbone in place.

• No Bump Or A Small One: grade 1 shows no deformity, grade 2 shows a modest prominence.
• Steady Improvement: symptoms ease noticeably week over week.
• Preserved Strength: overhead strength returns as pain settles.
• Localized Soreness: discomfort stays at the joint rather than radiating.

Grade 1 injuries commonly settle within two to three weeks. Grade 2 injuries take longer, often six weeks to three months, and frequently leave a small permanent step at the joint that is cosmetic rather than functional.

Symptoms of a Complete Separation, Grades 3 Through 6

Once both ligament systems fail, the collarbone loses its anchor and the symptoms change character rather than just degree.

• A Visible Bump: an obvious prominence at the top of the shoulder, often visible through a shirt.
• A Sagging Shoulder: the whole shoulder appears dropped relative to the elevated collarbone.
• Overhead Weakness: difficulty pressing, reaching, or carrying weight through the arm.
• Pain Across The Body: discomfort reaching toward the opposite shoulder, which loads the joint directly.
• A Sense Of Shifting: the feeling that something moves at the top of the shoulder under load.
• Sleep Disruption: difficulty lying on that side, common in grade 3 and above.

The sense of shifting deserves attention. It reflects instability rather than inflammation, and it is one of the findings most likely to indicate that non surgical treatment will not fully resolve the problem.

A visible bump is not proof of a separation on its own. A broken collarbone produces a similar prominence and the two are confused regularly on first examination. A separation is a ligament injury with the bone intact, a fracture is a break in the bone, and imaging distinguishes them immediately.

Late Symptoms Months After the Injury

Some patients feel reasonably well at six weeks and notice problems later, once they return to real demands on the shoulder.

• Aching With Load: discomfort that appears with carrying, pressing, or overhead work.
• Persistent Weakness: strength that never fully returns compared with the other side.
• A Bump That Remains: deformity that is permanent without reconstruction.
• Secondary AC Arthritis: joint surface wear developing over years after the original injury.

Aching in an injury that is years old is common, and it is not something a patient has to accept. Persistent symptoms in an old separation usually reflect either ongoing instability at the joint or arthritis that developed afterward, and both are treatable. Chronic reconstruction remains effective, and most patients in Dr. Struhl’s published outcomes study were chronic cases whose results matched the acute group.

Dr. Struhl treats persistent late symptoms as information rather than as something to wait out, noting that “it is our goal to establish tissue specific diagnosis early in the course of treatment, avoiding the weeks of therapy and repetitive injections that are typically given as initial treatment for orthopedic issues.” – Steven Struhl, MD, Board Certified Orthopedic and Sports Medicine Surgeon

When Symptoms Warrant a Second Look

• No Improvement By Six Weeks: symptoms that have not eased on the expected trajectory.
• A Bump With Weakness: visible deformity combined with difficulty overhead.
• Posterior Prominence: a bulge felt at the back of the shoulder rather than the top, which suggests a grade 4.
• Conflicting Advice: having been told different things by different clinicians.

The third one matters disproportionately. A grade 4 displaces backward rather than upward, so it can look unremarkable on a standard front to back X ray while the collarbone sits behind the acromion, and it requires reconstruction. The absence of a bump at the top of the shoulder does not rule out a significant injury, and neither does a normal looking film.

Schedule a Symptom Evaluation in New York City

Symptoms narrow the possibilities and do not settle the grade, which is why a shoulder that still hurts weeks after a fall deserves imaging rather than reassurance. Dr. Struhl evaluates AC joint injuries at his Manhattan and White Plains offices and reviews outside imaging for patients traveling from farther away. Contact Us at (212) 207-1990 in New York City or (914) 328-4111 in Westchester.