How to measure flexicurve?

How to measure flexicurve?

To calculate the flexicurve kyphosis index, the apex kyphosis height (B) is divided by the length of the entire thoracic curve (X) and then multiplied by 100 (B/X × 100). The flexicurve angle or theta (θ) is calculated using lines drawn perpendicular to the short sides of the triangle inscribed by the thoracic curve.

What is a flexicurve ruler?

Flexicurve ruler is a strip of flexible metal covered in plastic. It is a flexible curved ruler which is ideal for drawing or measuring curved patterns or curved shapes on pattern or fabric.

What is Flexi curve made of?

The flexicurve consists of a flexible metal ruler covered in plastic that can be molded to the back of the individual in order to replicate the shape of the spine.

How do you measure lumbar lordosis with a flexible ruler?

Flexible ruler (Flexicurve) is used to determine the degree of thoracic kyphosis and lumbar lordosis. This is done by the use of θ=4 Arctang 2H/L equation to convert the collected data to degree. In the equation the L lett er is the length of two obtained spinous process to the nearest millimeter.

What is Kyphotic index?

The kyphotic index uses a 60 cm flexicurve ruler, which can be bent in one plane and retain its shape, thus providing a mold of the spinal curve. The mold is traced onto paper and the height of the thoracic spine is determined by drawing a line perpendicular to the apex of the curve.

What is curve radius?

In differential geometry, the radius of curvature, R, is the reciprocal of the curvature. For a curve, it equals the radius of the circular arc which best approximates the curve at that point. For surfaces, the radius of curvature is the radius of a circle that best fits a normal section or combinations thereof.

What do you mean by degree of curve?

curve
Definition of degree of curve : a measure of the sharpness of curvature, for U.S. railroads usually being the angle subtended at the center of curvature by a chord 100 ft. long and for highways by an arc 100 ft.

What is used to draw irregular curves?

The large compass is used to draw circles or parts of circles, called arcs. Irregular curves (not circles or arcs) are drawn with special plastic instruments that are made in many different shapes. The most common of these instruments is called the French curve.

Are flexi rulers accurate?

This study showed that the two methods of flexible ruler measurements (mid pint and deep point as H value) are statistically different from each other. Hence it revealed that the deep point method is closed to X-ray method of lordosis measurements.