Which shoulder injury involves axial loading with internal rotation?

The injury characterized by axial loading combined with internal rotation of the shoulder is indeed related to a posterior dislocation. This mechanism typically occurs when a force is applied to the arm when it is in an internally rotated and adducted position, which can lead to the humeral head dislocating backward (posteriorly) out of the glenoid cavity.

In the context of shoulder mechanics, axial loading refers to an axial force applied along the length of the bone, which can result in various types of stress on the shoulder joint. When this is paired with internal rotation, it increases the likelihood of failure at the posterior aspect of the glenohumeral joint, causing the humeral head to dislocate posteriorly.

Understanding the biomechanics involved helps clarify why this type of injury manifests in scenarios like falls or direct blows that force the shoulder in that specific position. This also distinguishes it from other shoulder injuries, which have different mechanisms of injury and presentation.