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The Cobb angle is named after the American orthopedic surgeon John Robert Cobb (1903–1967). It was originally used to measure coronal plane deformity on radiographs with antero-posterior projection for the classification of scoliosis. [9]
Immature patients who present with Cobb angles greater than 30 degrees should be braced. However, these are guidelines and not every patient will fit into this table. For example, an immature patient with a 17-degree Cobb angle and significant thoracic rotation or flatback could be considered for nighttime bracing.
The standard method for assessing the curvature quantitatively is measuring the Cobb angle, which is the angle between two lines, drawn perpendicular to the upper endplate of the uppermost vertebra involved and the lower endplate of the lowest vertebra involved. For people with two curves, Cobb angles are followed for both curves.
Cobb Angle - (3 x Risser Sign) Progression Factor = ──────────────────────────────── Chronological Age From: Lonstein JE, Carlson JM (1984). "The prediction of curve progression in untreated idiopathic scoliosis during growth".
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.
John Robert Cobb (1903–1967), was an American orthopedic surgeon [1] who invented the eponymous Cobb angle, the preferred method of measuring the degree of scoliosis and post-traumatic kyphosis. Education
Three important angles used in his analysis are: 1. Saddle Angle - Na, S, Ar 2. Articular Angle - S-Ar-Go, 3. Gonial Angle - Ar-Go-Me. In a patient who has a clockwise growth pattern, the sum of 3 angles will be higher than 396 degrees. The ratio of posterior height (S-Go) to Anterior Height (N-Me) is 56% to 44%.
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