College of Massage Therapists of British Columbia (CMTBC) Practice Exam

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Which range of motion is classified as side flexion in the thoracic spine?

10-20 degrees
20-40 degrees
30-50 degrees
40-60 degrees

The correct answer is: 20-40 degrees

Side flexion, also known as lateral flexion, refers to the movement in which the spine bends to the side, allowing the thoracic spine to flex laterally. In the thoracic spine, the range of side flexion can vary based on individual anatomy and mobility, but typical estimations place it generally within the range of 20 to 40 degrees for normal, functional movement. The specific range of 20-40 degrees is considered a normative or functional range for lateral flexion in the thoracic spine. This range allows for adequate movement while also ensuring stability within the thoracic region, where the ribs provide structural support. Understanding the biomechanics of thoracic side flexion is vital, as it aids in assessing not only the motion capabilities of an individual but also informs clinical decisions regarding treatment or therapeutic interventions for restriction or discomfort in this area.