Which curve magnitudes and types are more likely to progress in spinal deformities?

The correct choice indicates that spinal deformities with a magnitude greater than 30 degrees, particularly those that present as single thoracic and double curves, are more likely to progress. Research has shown that curves of this magnitude are typically associated with a higher risk of clinical progression.

Single thoracic curves, for example, can significantly impact spinal mechanics, potentially leading to increased deformity over time. Similarly, double curves, or those that involve both a thoracic and lumbar region, can also exacerbate the overall spinal dysmorphism, heightening the risk of deterioration.

The reason this particular range and type of curves are emphasized is due to the biomechanical stresses placed on the spine as well as the tendency of these curves to continue to adapt and change as the body grows and matures, particularly during periods of rapid growth. In contrast, smaller curves (under 20 degrees) are generally considered stable and are less likely to show significant progression.

Curves between 25 to 30 degrees do raise some concerns about progression, particularly in younger patients, but they are not as definitively associated with progression as those greater than 30 degrees. Similarly, thoracolumbar curves above 35 degrees may indeed present with more serious complications but are more specific and