The muscle most commonly involved in a rotator cuff injury is the supraspinatus.

Name: The muscle most commonly involved in a rotator cuff injury is the supraspinatus.
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The supraspinatus muscle is the most frequently involved in rotator cuff injuries due to its critical role in shoulder movement and its vulnerable position beneath the acromion, making it susceptible to impingement and tears.

The Muscle Most Commonly Involved in a Rotator Cuff Injury