Which of the following is NOT listed as a mechanism causing intervertebral subluxation?

The correct answer highlights that lifestyle choices are not traditionally classified as a mechanism causing intervertebral subluxation according to Palmer Chiropractic Theory. The primary focus of this theory is on structural and physiological factors contributing to spinal misalignments.

Trauma, such as falls or accidents, is widely recognized as a direct cause of subluxation due to its immediate physical impact on the vertebral structures. Intervertebral disc (IVD) degeneration is another significant factor, as the degeneration of discs can lead to instability and misalignment of the vertebrae. Congenital factors are also acknowledged, since some individuals may have anatomical anomalies or structural predispositions from birth that influence spinal alignment.

In contrast, while lifestyle choices can affect overall health and may indirectly impact spinal health, they are not considered a direct mechanical cause of intervertebral subluxation in the core concepts of Palmer Chiropractic Theory. This distinction helps to delineate between the immediate physical causes of subluxation and those broader factors that may play a more indirect role in a person's overall musculoskeletal health.