Understanding Anterior Shoulder Instability: The Basics

The shoulder is one of the most mobile joints in the body, allowing us to reach, lift, and rotate with ease [1].

However, this flexibility comes at a cost – shoulder instability. One of the most common forms is anterior shoulder instability [2, 3]. This condition often affects active individuals and athletes but can also occur in anyone after a traumatic injury. If left untreated, it can lead to repeated dislocations, pain, and long-term joint problems [4].

— Learn more about Shoulder Instability 101: The Basics —

What Is Anterior Shoulder Instability?

Anterior shoulder instability occurs when the head of the humerus (upper arm bone) moves out of its socket toward the front of the shoulder. This usually happens after:

• A traumatic injury, such as a fall or collision
• A forceful overhead movement, like throwing or tackling
• Damage to stabilizing structures, such as the labrum, ligaments, or joint capsule

People often describe the sensation as the shoulder “slipping out” or feeling loose, especially during overhead or external rotation movements.

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Causes

The most common cause is a traumatic injury, such as falling on an outstretched arm or a collision in contact sports. Other contributing factors include:

• Previous shoulder dislocations
• Damage to the ligaments, labrum, or joint capsule
• Participation in overhead or throwing sports (e.g., baseball, volleyball)
• Joint laxity or hypermobility [3]

 — Learn more about Understanding Multidirectional Shoulder Instability —

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How is it diagnosed?

Common Symptoms

People with anterior shoulder instability often experience:

• Shoulder dislocations (the arm pops out to the front)
• A feeling of looseness or “giving way” in the joint
• Pain during overhead movements
• Weakness and limited range of motion
• Fear or anxiety of dislocation when reaching overhead or throwing

Common tests

A doctor will assess your symptoms and medical history and perform a detailed physical exam. This, combined with imaging tests, helps confirm the diagnosis. Imaging tests may include:

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Treatment Options

Management of anterior shoulder instability requires individualized, patient-centered care guided by risk stratification and shared decision-making.

Non-Operative

Treatment almost always begins with a course of non-operative management, typically involving a brief period of immobilization followed by structured physical therapy.

The focus is on restoring range of motion, rotator cuff and periscapular strength, and proprioceptive control.

For many patients, these non-operative measures are enough to return to desired activities with a relatively pain-free shoulder.
However, non-operative treatment is associated with a high risk of recurrent instability, particularly in young, active males and certain athletes.

Operative Treatment

Surgery may be recommended for patients at high risk of recurrence, such as young males, contact or collision athletes, or those with significant bony injuries[3].

Common surgical procedures include:

• Arthroscopic Bankart Repair – Effective for most patients with soft tissue injuries and/or small bony injuries
• Latarjet Procedure (or other bone augmentation procedures) – Indicated for patients with substantial glenoid bone loss, failed prior stabilization, or very high risk of recurrent instability

Shared decision-making is essential, weighing the risks and benefits of each approach, your goals as a patient, and the likelihood of recurrence. Early surgical intervention may be considered for young, active patients or those with high-risk features, while non-operative management may be reasonable for low-risk individuals.

Recovery from Instability Surgery

After surgery, most patients can expect a structured recovery process focused on regaining shoulder movement, strength, and function. Early on, the arm may be placed in a sling for comfort and protection, but gentle movement exercises often begin soon after to prevent stiffness and promote healing.

Adhering to the recommended rehabilitation program is critical –

patients who consistently perform their exercises tend to recover motion and experience less pain compared to those who do not follow their rehab plan.

By 3 to 6 months after surgery, most patients regain their pre-surgery range of motion and strength, though some may take longer, especially if they had multiple dislocations or naturally loose joints.

By 4 to 8 months, about three-quarters of patients return to their baseline shoulder movement and strength, and nearly all recover baseline strength. However, some may still notice mild weakness or stiffness, especially with certain movements[3, 5].

Returning to sports or high-level activities is a gradual process. Decisions are based on meeting specific strength and function goals, not just time since surgery. Functional tests and strength comparisons to the non-surgical shoulder help guide this decision. Psychological readiness – feeling confident and prepared to return to activity – is also important, as patients who feel ready tend to have better outcomes and a lower risk of re-injury.

It’s normal to have high expectations for a full recovery, but it’s important to understand that some patients may experience occasional pain or mild limitations, especially during demanding activities. Open communication with the care team and following the rehabilitation plan closely are key to achieving the best possible outcome.

Expert Contributor

Dr. Neil Thomas, PGY4 Orthopedic Surgery Resident at the Northern Ontario School of Medicine

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References Cited