Comprehensive Osteopathic Medical Licensing Examination (COMLEX USA) Practice

What type of trauma is associated with lateral strain in cranial mechanics?

1. Compression from the sides

2. Parallelogram-like force

3. Uppercut motion

4. Shearing in vertical alignment

The correct answer is: Parallelogram-like force

Lateral strain in cranial mechanics is linked to a parallelogram-like force because this type of trauma involves a combination of shearing and twisting forces that result in a lateral displacement of the cranial bones. In osteopathic cranial manipulation, lateral strain occurs when the base of the skull moves in one direction while the parietal bones shift in the opposite direction, much like the angles of a parallelogram adjusting. This creates a distortion in the symmetry of the cranial structure without fundamentally altering the overall cranial shape. The forces that lead to lateral strain are not primarily compressive or shearing alone. Instead, they evoke a certain directional force that aligns with the parallelogram model, emphasizing a diagonal or angular shift. This understanding is critical when evaluating how cranial sutures might respond to specific traumatic forces and aids in diagnosing and treating cranial dysfunctions. By recognizing the nature of lateral strain as more complex than simple compression or shearing, clinicians can implement appropriate therapies to restore balance within the cranial system.