Shoulder

AC Joint Injury / Separation

Q: Do I need surgery for a Grade III separation?

Not necessarily. The majority of Grade III patients do well with conservative treatment. Surgery is considered after 3–6 months of failed non-operative care or in high-demand athletes with persistent functional limitation.

Q: Why does my shoulder still have a bump after treatment?

A residual cosmetic prominence is common with Grade II and III injuries even after full functional recovery. This does not indicate treatment failure and rarely requires intervention.

Q: Can I play sports with an AC separation?

Grade I–II injuries can often return to sport with padding when pain-free. Higher-grade injuries require more structured rehabilitation and medical clearance before contact activities.

Q: How long does it take to recover from an AC joint separation?

Recovery from a Grade I or II AC joint separation typically takes two to six weeks of relative rest, ice, and gentle range-of-motion exercises, followed by a gradual return to full activity. Grade III injuries treated non-surgically may require six to twelve weeks before return to sport, particularly contact sports. Surgically treated high-grade separations generally require three to four months of rehabilitation before full return to throwing or overhead activities. At MOS we use functional milestones — not just time — to clear patients for return to sport.

Q: What are the long-term risks if a Grade III AC separation is not treated surgically?

The majority of patients with Grade III AC separations do well with non-surgical treatment and can return to full activity. A small proportion experience persistent pain, weakness with overhead lifting, or late development of AC joint arthritis from the residual malalignment. The visible bump at the top of the shoulder (due to the displaced clavicle) is permanent in patients treated without surgery. Your MOS surgeon will discuss the likelihood of each outcome based on your activity demands, shoulder dominance, and the specific characteristics of your injury.

An AC joint separation — sometimes called a "separated shoulder" — is a disruption of the ligaments connecting the collarbone to the shoulder blade. It is among the most common shoulder injuries in contact athletes and cyclists. At Maryland Orthopedic Specialists, our sports medicine team accurately classifies every AC joint injury and provides targeted treatment — from conservative management of mild separations to surgical reconstruction of higher-grade injuries — with the goal of returning you to full activity as safely and efficiently as possible.

Ready to get started?

Schedule an appointment with a specialist experienced in treating ac joint injury / separation.

Schedule Now

or call (301) 515-0900

In-network with most major insurance plans. Same-day appointments available for acute injuries.

What is ac joint injury / separation?

The acromioclavicular (AC) joint is the articulation between the lateral end of the clavicle and the acromion process of the scapula. It is stabilized by the coracoclavicular ligaments. Injuries are common in sports and in cycling. Low grade injuries are self-limited.

The acromioclavicular (AC) joint is the articulation between the lateral end of the clavicle and the acromion process of the scapula. Two sets of ligaments maintain its integrity:

AC ligaments (anterior, posterior, superior, inferior): Provide horizontal stability; resist anteroposterior translation of the clavicle
Coracoclavicular (CC) ligaments — trapezoid (lateral) and conoid (medial): Provide vertical stability; resist superior displacement of the clavicle relative to the acromion

AC joint separations most commonly result from a direct fall onto the point of the shoulder (point-of-impact mechanism), forcing the acromion inferiorly while the clavicle maintains its position, progressively tearing these ligaments.

Rockwood Classification (Grades I–VI)

The Rockwood classification is the universally used grading system:

Rockwood Classification:

Grade I — AC ligament sprain; no displacement; managed non-operatively
Grade II — AC ligament torn, CC ligaments sprained; slight displacement (<25% CC widening); managed non-operatively
Grade III — AC and CC ligaments torn; 25–100% superior displacement; management controversial
Grade IV — Clavicle displaced posteriorly into trapezius; operative
Grade V — Severe superior displacement (100–300%); operative
Grade VI — Clavicle displaced inferiorly (subcoracoid); rare; operative

Grade III injuries are the most debated: outcomes of non-operative and operative management are roughly equivalent for most patients, and initial conservative management with delayed surgical decision-making is supported by current evidence.

Treatment options

Non-Operative (Grades I and II, Most Grade III)

- Sling immobilization for 1–2 weeks followed by progressive range-of-motion and strengthening exercises - Ice and NSAIDs for acute pain management - Physical therapy targeting scapular stabilization, rotator cuff strengthening, and AC joint protection - Return to sport typically within 2–6 weeks for Grade I–II; 6–12 weeks for Grade III managed conservatively

Surgical Procedure

AC Joint Reconstruction

Surgical reconstruction of the acromioclavicular joint for high-grade separations (grade III–V), restoring the normal relationship between the clavicle and acromion using ligament transfer, allograft, or synthetic augmentation.

Click for more Surgical Procedure

Distal Clavicle Excision

Arthroscopic removal of the distal 5–8 mm of the clavicle to eliminate bone-on-bone contact causing AC joint arthritis pain. Frequently performed alongside rotator cuff repair or other shoulder procedures at the same sitting.

Click for more

Frequently Asked Questions

Do I need surgery for a Grade III separation?

Not necessarily. The majority of Grade III patients do well with conservative treatment. Surgery is considered after 3–6 months of failed non-operative care or in high-demand athletes with persistent functional limitation.

Why does my shoulder still have a bump after treatment?

A residual cosmetic prominence is common with Grade II and III injuries even after full functional recovery. This does not indicate treatment failure and rarely requires intervention.

Can I play sports with an AC separation?

Grade I–II injuries can often return to sport with padding when pain-free. Higher-grade injuries require more structured rehabilitation and medical clearance before contact activities.

How long does it take to recover from an AC joint separation?

Recovery from a Grade I or II AC joint separation typically takes two to six weeks of relative rest, ice, and gentle range-of-motion exercises, followed by a gradual return to full activity. Grade III injuries treated non-surgically may require six to twelve weeks before return to sport, particularly contact sports. Surgically treated high-grade separations generally require three to four months of rehabilitation before full return to throwing or overhead activities. At MOS we use functional milestones — not just time — to clear patients for return to sport.

What are the long-term risks if a Grade III AC separation is not treated surgically?

The majority of patients with Grade III AC separations do well with non-surgical treatment and can return to full activity. A small proportion experience persistent pain, weakness with overhead lifting, or late development of AC joint arthritis from the residual malalignment. The visible bump at the top of the shoulder (due to the displaced clavicle) is permanent in patients treated without surgery. Your MOS surgeon will discuss the likelihood of each outcome based on your activity demands, shoulder dominance, and the specific characteristics of your injury.