INFRASPINATUS

• Origin

Infraspinous fossa of the scapula

• Insertion

Greater tubercle of the humerus

• Agonist(s)

- Teres minor

- Teres major

- Deltoid

• Antagonist(s)

- Subscapularis

• Function

Lateral rotation of the humerus, shoulder joint stabilization

TRIGGER POINT(S)

• Location

Trigger points can be found near the scapular spine, particularly in the mid to lower portion of the muscle.

• Pain Referral Pattern

Pain often refers to the back of the shoulder and upper arm.

It can cause deep, achy pain in the shoulder joint, particularly with arm movement, and may extend down the back of the arm toward the elbow.

• Potential Causes

• Overuse or repetitive activities involving arm movement, such as throwing, lifting, or reaching.

• Poor posture, especially with rounded shoulders.

• Trauma or injury to the shoulder or upper arm.

• Muscle imbalances between the infraspinatus and other shoulder muscles.

• Prevention Tips

• Use proper techniques during activities involving arm movement to avoid overloading the infraspinatus.

• Incorporate regular stretching and strengthening exercises for the shoulder and upper back muscles.

• Maintain good posture and shoulder alignment, especially during upper body activities.

• Gradually increase workout intensity to avoid sudden strain.

• Ensure balanced strength training to avoid muscle imbalances.