Physical Therapy Assistant Practice Exam

When measuring cervical lateral flexion, where should the axis of the goniometer be placed?

1. Over the external auditory meatus

2. Over the spinous process of C7 vertebra

3. Over the shoulder

4. Over the temporal bone

The correct answer is: Over the spinous process of C7 vertebra

The axis of the goniometer used to measure cervical lateral flexion should be placed over the spinous process of the C7 vertebra. This positioning is critical because the C7 vertebra, also known as the vertebra prominens, has a prominent spinous process that is easily palpable and serves as a reliable anatomical landmark. Placing the axis here ensures accurate measurement of the range of motion as the head tilts laterally, reflecting the actual movement occurring at the cervical spine. Proper alignment is essential to obtain a valid measurement. In lateral flexion, the movement primarily occurs in the cervical region, and the C7 vertebra is strategically located where the cervical spine transitions into the thoracic spine. By centering the goniometer over the C7 spinous process, it allows for a clear reference point that correlates directly with the motion being measured, enhancing the precision of the assessment. Other locations mentioned, such as the external auditory meatus or the temporal bone, while relevant anatomical landmarks, do not correspond as directly to the motion of cervical lateral flexion as the C7 vertebra does. In contrast, the shoulder may infer involvement from the upper limbs but does not represent the cervical movement itself. Thus, the C7 spin