Final answer:
None of the rotator cuff muscles listed (subscapularis, supraspinatus, infraspinatus, teres minor) primarily produce a frontal plane movement through concentric contraction, which is generally associated with abduction or adduction movements. However, the deltoid muscle, which is not listed, is a major contributor to arm abduction in the frontal plane.
Step-by-step explanation:
The question asks which rotator cuff muscle creates a frontal plane movement when it contracts concentrically. The rotator cuff muscles include the subscapularis, supraspinatus, infraspinatus, and teres minor. Each of these muscles aids in different movements of the arm at the shoulder joint. Of the listed options, the subscapularis is responsible for medially rotating the arm. However, this muscle's action does not directly result in a frontal plane movement (movement parallel to the long axis of the body), which is typically associated with muscles that affect abduction or adduction.
The deltoid muscle, not mentioned as an option in this question, plays a major role in abducting the arm in the frontal plane, and the supraspinatus assists, although the supraspinatus primarily acts in the first 15 degrees of abduction. The infraspinatus and teres minor both primarily provide lateral rotation of the arm, which is not a frontal plane movement. It seems there might be some confusion in the question, as none of the rotator cuff muscles primarily produce frontal plane movements through concentric contraction; they are more involved in rotational movements or initial phases of abduction.