Professional
Technical
IVT
Cobb angle
Standard radiographic measurement used to quantify the degree of spinal curvature in scoliosis.
Full Definition
A standardized method for measuring spinal curvature on anteroposterior radiographs, developed by Dr. John Robert Cobb. The measurement is taken by drawing lines parallel to the superior endplate of the upper end vertebra and the inferior endplate of the lower end vertebra of a curve, then measuring the angle between perpendicular lines drawn from these reference lines. Cobb angles greater than 10 degrees define scoliosis, with surgical intervention typically considered for curves exceeding 40-50 degrees.
Usage
Usage note: Always capitalize 'Cobb' as it is an eponym. Express measurements in degrees.
In Context
- "The Cobb angle measured 52 degrees at the thoracic curve apex." — radiology report
- "Post-operative radiographs showed correction of the Cobb angle to 18 degrees." — follow-up documentation
Also known as
Cobb measurement
Don't confuse with
Ferguson angle
lumbar lordosis angle