Define nonstructural curve structural curve major curve minor curve full curve and fractional curve

Patients typically present with a combination of fixed and flexible spinal deformities. Side-bending radiographs are used to assess the flexibility of curves that comprise a spinal deformity.

• Curves that correct completely when the patient bends toward the convexity of the curve are termed nonstructural curves. Nonstructural curves permit the shoulders and pelvis to remain level to the ground and permit the head to remain centered in the midline above the pelvis. For this reason, nonstructural curves are also referred to as compensatory curves. Over time, compensatory curves may develop structural characteristics

• Curves that do not correct completely are termed structural curves

• The major curve is the curve with the largest Cobb measurement and is always a structural curve

• All other curves are termed minor curves and may be either structural or nonstructural, depending on classification criteria

• Curves in which both end vertebrae are tilted from the horizontal are termed full curves. Full curves and fractional curves are distinguished by assessing the angular displacement of the end vertebra of the curve

• Curves that have one end vertebra parallel to the ground are termed fractional curves

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