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Which curvature of the vertebral column is not classified as an abnormal curvature?

  1. Kyphosis

  2. Lordosis

  3. Scoliosis

  4. Spondylosis

The correct answer is: Spondylosis

The curvature of the vertebral column that is not classified as an abnormal curvature is spondylosis. Spondylosis refers to a degenerative condition of the spine, which involves wear and tear of the intervertebral discs and the vertebrae. This condition can cause changes in the structure of the spine but does not specifically refer to alterations in the normal curvature pattern of the spine like kyphosis, lordosis, and scoliosis. Kyphosis is characterized by an exaggerated forward rounding of the back, lordosis describes an excessive inward curve of the lumbar region, and scoliosis refers to an abnormal lateral curvature of the spine. All these conditions are recognized as abnormal curvatures because they deviate from the typical alignment and curvature of a healthy spine. In contrast, spondylosis itself does not represent a specific curvature but rather a degenerative change, thereby making it the correct response in this context.