Final answer:
Kyphosis is the term for what is commonly referred to as humpback or hunchback, which is an excessive posterior curvature of the thoracic spine, often linked to conditions like osteoporosis.
Step-by-step explanation:
Kyphosis is also referred to as humpback or hunchback. It is characterized by an excessive posterior curvature of the thoracic region of the vertebral column. Conditions such as osteoporosis can lead to weakening and erosion of the anterior portions of the thoracic vertebrae, which can then result in the development of kyphosis. This condition can cause the upper back to have a noticeable arch, giving the appearance of a hump. Other disorders that affect spinal curvature include lordosis, an excessive anterior curvature of the lumbar region, commonly associated with obesity or late pregnancy, and scoliosis, which is an abnormal lateral curvature and twisting of the vertebral column.