Infraspinatus

The infraspinatus is one of the four rotator cuff muscles. Its job is to assist with shoulder movement and stabilizing the glenohumeral joint. The muscle is triangular and thick with tendinous fibers. It is attached to the scapula (shoulder blade) and the humerus bone. The muscle belly is easy to palpate, identify, and massage.

Common problems with infraspinatus:

  • Pain deep in the front of the shoulder
  • Pain radiating from the front and outside of the arm, down into the hand
  • Pain in the back of the neck to the base of the skull
  • Upper back pain at the inside (medial border of the scapula) edge of the shoulder blade
  • Weakness/stiffness in shoulder and arm

Do you feel pain when combing your hair, brushing your teeth, or reaching behind for a bra strap? Is it painful to sleep on the affected side? One of your rotator cuff muscles could be the culprit. Here are some activities that can cause trouble for the infraspinatus:
  • Painting
  • Swimming
  • Keeping arms raised for a long period of time
  • Driving with hands on top of the steering wheel for long periods of time
  • Typing at a computer with extended arms
  • Baseball, tennis, football
  • Strength training

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