What Causes Glenohumeral Internal Rotation Deficit (GIRD)?

Shoulder stiffness can be frustrating, especially when it starts affecting activities you normally do without thinking. Whether you are an athlete, someone who performs repetitive overhead movements, or simply trying to stay active, losing shoulder mobility can impact your performance and comfort.

You may notice difficulty reaching behind your back, decreased throwing ability, or discomfort during certain movements. Understanding what causes glenohumeral internal rotation deficit, often called GIRD, can help you address the problem before it leads to more significant shoulder issues.

What Is Glenohumeral Internal Rotation Deficit (GIRD)?

Glenohumeral internal rotation deficit is a condition where the shoulder loses internal rotation range of motion compared to the opposite shoulder. Internal rotation is the movement that allows you to rotate your arm inward, such as reaching behind your back.

GIRD is most commonly seen in athletes who perform repetitive overhead motions, including baseball players, tennis players, swimmers, and volleyball players.

What Causes Glenohumeral Internal Rotation Deficit?

Several factors can contribute to GIRD, including:

Repetitive Overhead Activities

Repeated throwing or overhead motions place significant stress on the shoulder. Over time, these movements can cause adaptive changes in the muscles and connective tissues surrounding the joint.

Posterior Shoulder Tightness

Tightness in the muscles and soft tissues at the back of the shoulder is one of the most common causes of GIRD. This tightness can limit normal shoulder motion and alter movement mechanics.

Capsular Tightness

The shoulder joint is surrounded by a capsule of connective tissue. Repetitive stress may cause the posterior portion of the capsule to tighten, restricting internal rotation.

Muscle Imbalances

Weakness or imbalance between the shoulder stabilizers and larger movement muscles can contribute to abnormal shoulder mechanics.

Poor Movement Patterns

Improper throwing mechanics or repetitive movement errors may increase stress on the shoulder and contribute to mobility restrictions over time.

What Are the Symptoms of GIRD?

Common symptoms may include:

• Loss of shoulder internal rotation

• Difficulty reaching behind the back

• Shoulder tightness

• Reduced athletic performance

• Shoulder pain during overhead activities

• Feeling of stiffness during movement

In some cases, symptoms develop gradually and may be overlooked until they begin affecting performance or daily activities.

Who Is Most at Risk for GIRD?

GIRD is most commonly associated with athletes who perform repetitive overhead movements, including:

• Baseball pitchers

• Softball players

• Tennis players

• Volleyball players

• Swimmers

However, non-athletes who perform repetitive overhead work may also develop shoulder mobility restrictions.

Can GIRD Lead to Other Shoulder Problems?

Yes. When shoulder motion becomes restricted, the body often compensates with altered movement patterns. Over time, this may increase stress on other structures within the shoulder.

This can contribute to conditions such as shoulder impingement, rotator cuff irritation, and instability. Similar movement dysfunction can also be seen in conditions like glenohumeral dislocation, where shoulder stability becomes a significant concern.

How Is GIRD Treated?

Treatment typically focuses on restoring shoulder mobility and improving movement mechanics.

Stretching and Mobility Exercises

Targeted exercises help improve internal rotation and reduce soft tissue restrictions.

Strengthening the Shoulder

Improving strength in the rotator cuff and scapular stabilizers supports better shoulder function.

Correcting Movement Patterns

Addressing faulty movement mechanics can reduce stress on the shoulder and improve performance.

Activity Modification

Temporary adjustments to activity levels may help reduce irritation and allow recovery.

Can Physical Therapy Help GIRD?

Yes. Physical therapy is often one of the most effective conservative treatments for GIRD. Treatment focuses on restoring mobility, improving strength, and correcting movement patterns that contribute to the condition.

This approach is similar to managing conditions like dorsal scapular neuropathy, where shoulder blade function and movement quality play an important role in recovery.

Why Early Treatment Matters

Ignoring shoulder mobility restrictions can increase the risk of developing additional shoulder problems. Early intervention can help restore normal movement and reduce unnecessary stress on the joint.

The sooner mobility deficits are addressed, the easier it may be to maintain healthy shoulder function and prevent future complications.

Restore Healthy Shoulder Movement

If you are experiencing shoulder stiffness, limited mobility, or symptoms of glenohumeral internal rotation deficit, contact Altair Integrative Wellness in Wasilla, AK to schedule an evaluation. A thorough assessment can help identify contributing factors and guide an appropriate treatment plan to improve shoulder mobility and function.

Altair Integrative Wellness

892 E Usa Cir Ste 108

Wasilla, AK 99654

Phone: +1 907-357-1818