Cobb angle
Pronunciation: kob ANG-gul
The standard radiographic measurement used to quantify the degree of spinal curvature in scoliosis patients.
Full Definition
The Cobb angle is the gold standard measurement for quantifying scoliosis severity on standing posteroanterior spinal radiographs. Named after orthopedic surgeon John Robert Cobb, the measurement is taken between the most tilted vertebrae at the top and bottom of the curve (end vertebrae). Lines are drawn along the superior endplate of the upper end vertebra and the inferior endplate of the lower end vertebra; the angle between perpendicular lines to these endplates constitutes the Cobb angle. Curves measuring 10-25 degrees are considered mild, 25-40 degrees moderate, and greater than 40 degrees severe.
Usage
Usage note: Capitalize 'Cobb' as it's named after a person. Always expressed in degrees.
In Context
- "The patient's thoracic curve measured 35 degrees by Cobb angle measurement on standing radiographs." — radiology report
- "Bracing is typically recommended for skeletally immature patients with Cobb angles between 20-40 degrees." — treatment guideline