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Cobb angle measurement of a scoliosis; concave side on the left; convex side on the right Vertebra and curves of the vertebral column Cobb angle is a common measure to classify scoliosis. The greater the angle, the more serious is the disease but the smaller is the number of patients.
Scoliosis affects 2–3% of the United States population, or about five to nine million cases. [4] A scoliosis (spinal column curve) of 10° or less affects 1.5–3% of individuals. [100] The age of onset is usually between 10 years and 15 years (but can occur younger) in children and adolescents, making up to 85% of those diagnosed.
The Scoliosis Research Society has proposed a range of 40° and 60° as measured between the upper endplate of Th12 and the upper endplate of S1. [18] Individual studies, although using other reference points, have found normal ranges up to approximately 85°. [18] It is generally more pronounced in females. [18]
Kyphosis (from Greek κυφός (kyphos) 'hump') is an abnormally excessive convex curvature of the spine as it occurs in the thoracic and sacral regions. [1] [2] Abnormal inward concave lordotic curving of the cervical and lumbar regions of the spine is called lordosis.
The term convex is often referred to as convex down or concave upward, and the term concave is often referred as concave down or convex upward. [ 3 ] [ 4 ] [ 5 ] If the term "convex" is used without an "up" or "down" keyword, then it refers strictly to a cup shaped graph ∪ {\displaystyle \cup } .
A function f is concave over a convex set if and only if the function −f is a convex function over the set. The sum of two concave functions is itself concave and so is the pointwise minimum of two concave functions, i.e. the set of concave functions on a given domain form a semifield.
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Kyphoscoliosis describes an abnormal curvature of the spine in both the coronal and sagittal planes. It is a combination of kyphosis and scoliosis.This musculoskeletal disorder often leads to other issues in patients, such as under-ventilation of lungs, pulmonary hypertension, difficulty in performing day-to-day activities, and psychological issues emanating from anxiety about acceptance among ...