Rotator Cuff and Shoulder Joint

A 58-year-old male carpenter from Delhi presents with a 3-month history of progressive right shoulder pain and weakness. He reports difficulty lifting objects overhead and pain when reaching behind his back. On examination, he has positive "drop arm" sign and "lag sign." Passive range of motion is preserved. MRI shows a full-thickness tear of the supraspinatus tendon with mild retraction. What is the most likely anatomical consequence of this injury?

A 42-year-old female physiotherapist from Mumbai reports chronic left shoulder pain for 8 months with difficulty reaching behind her back to fasten her bra. She has no history of trauma. On examination, the "lift-off test" (Gerber's test) is positive, and she cannot internally rotate the shoulder against resistance. Passive internal rotation is full. What is the most likely rotator cuff muscle involved?

Which rotator cuff muscle is responsible for external rotation of the shoulder and is most commonly injured in overhead throwing athletes?

The rotator cuff is composed of four muscles. Which of the following is NOT a rotator cuff muscle?