TWI617290B - A method applying spinal related geometry to evaluate the severity of scoliosis - Google Patents

Abstract

X-ray examination of scoliosis remains the current tool for diagnosing and assessing severity. Currently assessing the severity of the scoliosis, the most common method is the Cobb’s angle, and it also affects the way the treatment is performed. However, the Cobb's angle is still controversial regardless of whether the same tester has measured multiple times at different times or the results of different testers' measurements on the same X-ray film. In addition, the meaning of the angle is more difficult to explain to patients or family members.

This invention uses the concept of a triangular center of the heart, using the line of the midpoint of the spine to draw the degree of scoliosis of a particular section. This method can display the lateral curvature of the spine, which is shown in one section, and does not need to be calculated by Cobb's angle to determine the "bending change" of the spine, which can effectively reduce the measurement error and greatly improve the inconvenience of interpretation. At the same time, because it is a section measurement, and from the position of the center of the spine relative to the spine, the research and direction of scoliosis can be described more accurately. By comparing the radius to the width of the spine, a comparison between different X-ray sheets can be used. This new measurement method provides a more accurate assessment of the effectiveness of the backrest or exercise therapy.

Description

A method for measuring scoliosis by using spine-related geometry

Measuring the measurement of scoliosis.

The most commonly used in clinical practice is the Cobb's angle, which is the upper edge line and the lower edge line of the entire column side bending line, and the sharp angle obtained by crossing the vertical line of the upper edge line and the lower edge line is the scoliosis. Degree.

However, in this way, only the maximum curvature of the entire spine can be measured. Except for patients and family members who are not easily explained by clinical doctors or therapists, it is not easy to imagine, and most of them are single measurements, and each single measurement Values can have large errors.

Even if computer-assisted Cobb's angle is used, although the error of each measurement can be improved, the measured value is still the degree of overall scoliosis, and it cannot be measured in a separate section. For example, patients need to follow X-rays. It is impossible to correctly compare the degree of change in each section.

The use of X-rays to track scoliosis requires consideration of different X-ray sizes, which can cause errors in the measurement angle.

Find the midpoint of the spine on a general spine X-ray.

Using the above method, find out the center of the spine and the center of the center of the heart after normalization. Set.

The outer radius of the obtained spine after normalization can be used to represent the severity and direction of the scoliosis.

Clinical interpretation can be directly explained by the patient's or family's [circle] curvature of a few centimeters.

Figure 1: After finding the midpoint of the spine for this patent, the outline of the outer center is found from the midpoint of three adjacent spines.

Figure 2: Schematic diagram of the bending direction and severity of different vertebral segments measured for this patent.

Figure 3: Schematic diagram of the process of measuring the scoliosis of the patent

Under the X-ray film, the four apex angles of the spine are connected to obtain the midpoint of the line, that is, the midpoint of the scoliosis is measured.

Find out the above-mentioned midpoint of the spine in the upper and lower sections of the vertebral section. There will only be one circle at the same time passing through the midpoint of the three spines.

Find the circle that passes through these three points at the same time. The center of the circle is the outer center of the three points.

The radius of the circle was measured as a, and the maximum width of the spine was measured as b. The position of the outer center can be used to represent the direction of the scoliosis.

In order to compare the magnification ratio X-ray sheets at different times, the circle radius is normalized. Using the formula: a, in addition to b, the ratio obtained can be used to describe the severity of scoliosis.

Then, move to the spine of other curved surfaces, repeat the above steps, record the outer radius of the curvature curve of each spine and the maximum width of the spine, and calculate the ratio of the center of the spine and the radius of each spine.

Taking the S-shaped scoliosis as an example, the position of the outer center can be determined as the direction of the scoliosis on the left or right side of the spine. Under X-rays, the patient is the opposite of the photo itself. The spine exhibits an S-shaped bend. Taking the third example as an example, there are three circumscribed circles drawn by the centers C, A, E, D, and G of the spine. In the case of the spine A, the radius of the circumscribed circle is f, and the center position Ec is on the left side of the spine; in the case of the spine B, the radius of the circumscribed circle is g, and the position of the center Fc is on the left side of the spine. The radius g of the center of the circle is obviously larger than f, which means that the curvature directions of the spine A and the spine B are the same, and the severity of the curvature of the spine A is significantly larger than that of the spine B. Further, the circumscribed circle center Cc formed by the spines G, D, and B is located on the right side of the patient, and is different from the spine B, so that the change in the rotational direction occurs in the spine.

Claims (1)

A method for measuring scoliosis by using a spine-related geometry includes: (1) measuring a midpoint of a line connecting four apex angles by using each spine geometry, and measuring the maximum width of the spine at the point b; (2) the corresponding points measured by the spine are connected, and the circle passing through the three points is measured; (3) the outer center of the circle is calculated, the radius of the circle is a, and a is divided by b Calculate a/b as a means of expressing the degree of scoliosis and can be used to compare between different X-ray films; in addition, the position of the outer core can be used to describe the direction of scoliosis; (4) Move to the spine of the other curved surface and repeat steps (1) through (3) above.