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A method for obtaining normal reference value of joint non-bone modeling partition volume ratio

An acquisition method and volume ratio technology, applied in the field of lower limb correction, can solve problems such as time-consuming, key angle errors, and difficulty in finding the highest point, so as to achieve good guiding effects and accurate judgment results

Active Publication Date: 2021-02-19
成都真实维度科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above judgment depends on the patient's standing posture and scanning position. Different standing postures and deviations in the scanning position will lead to errors in several key angles between the femur and the tibia. This has technical problems such as insufficient judgment and too large errors
In addition, the existing methods also use the method of biological force lines to judge the deformity of the lower limbs. First, find out the center of the bone identification point, that is, you need to find the highest point on the inside and outside of the bone. In the case of bone wear, it is difficult to find the highest point. ; In addition, different people do it, and the highest point found is also different, and it takes more time
[0005] Therefore, prior art can not make accurate judgment to lower extremity leg deformity situation

Method used

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  • A method for obtaining normal reference value of joint non-bone modeling partition volume ratio
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  • A method for obtaining normal reference value of joint non-bone modeling partition volume ratio

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Embodiment 1

[0065] A method for obtaining a normal reference value of a joint non-bone modeling partition volume ratio, comprising the steps of:

[0066] S1. Construct a knee joint cavity model;

[0067] S2. Find the geometric center point of the knee joint cavity model;

[0068] S3. Taking the geometric center point of the knee joint cavity model as the coordinate origin, establish a space rectangular coordinate system;

[0069] S4. Calculate the volume of the knee joint cavity in each hexagram of the space Cartesian coordinate system;

[0070] S5. According to the volume of the knee joint cavity, calculate the volume ratio of the lateral and medial knee joints of the distal end of the femur, the volume ratio of the lateral and medial knee joints of the tibial plateau, the volume ratio of the anterior and posterior knee joints of the distal femur, and the volume ratio of the anterior and posterior knee joints of the tibial plateau , get the normal reference value.

[0071] The method ...

Embodiment 2

[0076] A method for obtaining a normal reference value of a joint non-bone modeling partition volume ratio, comprising the steps of:

[0077] S1. Construct a knee joint cavity model;

[0078] S2. Find the geometric center point of the knee joint cavity model;

[0079] S3. Taking the geometric center point of the knee joint cavity model as the coordinate origin, establish a space rectangular coordinate system;

[0080] S4. Calculate the volume of the knee joint cavity in each hexagram of the space Cartesian coordinate system;

[0081] S5. According to the volume of the knee joint cavity, calculate the volume ratio of the lateral and medial knee joints of the distal end of the femur, the volume ratio of the lateral and medial knee joints of the tibial plateau, the volume ratio of the anterior and posterior knee joints of the distal femur, and the volume ratio of the anterior and posterior knee joints of the tibial plateau , get the normal reference value.

[0082] Further, be...

Embodiment 3

[0087] The difference between this embodiment and embodiment 1 is:

[0088] After step S5, step S6 is also included, where the obtained data of each volume ratio is normally distributed to obtain the normal reference value of each volume ratio, and construct a standard range comparison table.

[0089] The sampling in the step SO includes dividing the population by age groups, and randomly sampling the population of each age group.

[0090] By means of normal distribution, select the area with relatively concentrated values ​​from each volume ratio as a reference value, and build a standard range comparison table to provide a data basis for the judgment of lower limb deformities; and through the crowd of different age groups Division, and random sampling in each age group, thereby making the normal reference value of the present invention more scientific and reasonable.

[0091] All the other parts are identical with embodiment 1.

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Abstract

The invention belongs to the technical field of lower limb correction. The invention discloses a method for obtaining a normal reference value of a joint non-bone modeling partition volume ratio, including steps S1. Constructing a knee joint cavity model; S2. Finding a knee joint cavity The geometric center point of the model; S3. take the geometric center point of the knee joint cavity model as the coordinate origin, establish a space Cartesian coordinate system; S4. calculate the volume of the knee joint cavity part in each hexagram limit of the space Cartesian coordinate system; S5. According to the volume of the knee joint cavity, calculate the volume ratio of the lateral and medial knee joints of the distal end of the femur, the volume ratio of the lateral and medial knee joints of the tibial plateau, the volume ratio of the anterior and posterior knee joints of the distal femur, and the volume ratio of the anterior and posterior knee joints of the tibial plateau , get the normal reference value. The invention provides accurate analysis data for judging the deformity of the knee joint and reduces the time required for judging the deformity of the knee joint.

Description

technical field [0001] The invention belongs to the technical field of lower limb correction, and in particular relates to a method for obtaining a normal reference value of the volume ratio of a non-skeletal modeling partition of a joint. Background technique [0002] Knee valgus (X-shaped leg) and genu varus (O-shaped leg) are common leg deformities in China, especially among adolescents. The main cause of genu valgus or genu varus is rickets in children, and a small part is due to sequelae caused by cartilage development disorders, fractures, trauma, and osteoma. When children suffer from rickets, due to insufficient calcium salts, the hyperplastic cartilage of the epiphysis cannot be ossified normally, and the original bone is decalcified and resorbed, so the bone softens and cannot withstand the action of gravity. In addition, the ligaments around the knee joint are loose. Losing the support and protection of the bone, the bending deformation of the lower leg bone occu...

Claims

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Application Information

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IPC IPC(8): G06T7/00G06T7/62G06T17/00
CPCG06T7/0012G06T17/00G06T2207/10081G06T2207/30008G06T2210/41G06T7/62
Inventor 王卫明曲飞寰
Owner 成都真实维度科技有限公司
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