What is the risk of progression of the various types of hemivertebra

• Fully segmented. There are two extra growth plates on one side of the spine. Unbalanced growth occurs, producing a scoliosis that worsens at a rate of 1 to 2° per year. Two fully segmented hemivertebra on the same side of the spine produce a more rapid deterioration (about 3° per year).

• Semisegmented. One border is synostosed to its neighbor, producing a balanced number of growth plates on either side. The hemivertebra produces a tilting of the spine, and a slowly progressive curvature may occur.

• Nonsegmented. No growth plates are associated with this type of hemivertebra, and a progressive deformity does not occur.

• Incarcerated. The vertebral bodies above and below accommodate the hemivertebra, and little or no deformity is produced. The growth plates tend to be narrow with little growth potential. This form of hemivertebra causes little or no deformity.

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