COMLEX USA Practice Exam 2025 – The All-in-One Guide to Master the Comprehensive Osteopathic Medical Licensing Exam

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In a Right on Left sacral torsion, which sulcus is typically deep?

Left

In a Right on Left sacral torsion, the left sulcus is typically deep because of the mechanics involved in the torsion. In this sacral dysfunction, rotation occurs around the oblique axes that are oriented from the left sacral sulcus to the right inferior lateral angle. As the sacrum rotates, the left side becomes compressed and results in a deepening of the left sulcus. Conversely, the right sulcus is raised as the right inferior lateral angle moves forward.

This pattern is a hallmark of Right on Left sacral torsion, which can often be appreciated during a physical examination. The asymmetry is a key feature in diagnosing the type of torsion based on palpatory findings. Recognizing these anatomical and biomechanical relationships is crucial for accurately diagnosing and treating sacral torsion issues in an osteopathic context.

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