National Board of Chiropractic Examiners (NBCE) Practice Test

When a posterior ischium is corrected, the axis of rotation occurs through the ______________________.

1. Pelvis

2. Femur

3. Sacrum

4. Ischial tuberosity

The correct answer is: Ischial tuberosity

The ischial tuberosity serves as a significant anatomical landmark in the pelvis and the primary site of attachment for various ligaments and muscles. When a posterior ischium is corrected, the axis of rotation will occur through the ischial tuberosity because this structure provides a stable point for movement and adjustment during the correction process. The reason the ischial tuberosity is the axis of rotation is that correcting a posterior displacement involves realigning the ischium back into its normal position. This motion essentially pivots around the ischial tuberosity, allowing for effective correction of the ischial alignment with minimal disruption to the surrounding structures. In contrast, while the pelvis, femur, and sacrum play essential roles in overall movement and stability, they do not specifically serve as the axis for the correction of a posterior ischium. Correcting the ischium directly utilizes the ischial tuberosity for reference, making it the focal point for this rotational adjustment.