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Wear evaluation method for articular cartilage injuries

A technology of articular cartilage and evaluation method, applied in the direction of measuring device, instrument, electric/magnetic profile/curvature measurement, etc., can solve the problems of misjudgment of surface damage, roughness, etc., and achieve high precision, precise measurement, and convenient and fast method Effect

Active Publication Date: 2015-11-25
CHINA UNIV OF MINING & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no necessary relationship between surface roughness and damage and wear. With different degrees of damage, the surface of cartilage may become smoother or rougher, so surface damage and wear will lead to misjudgment

Method used

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  • Wear evaluation method for articular cartilage injuries
  • Wear evaluation method for articular cartilage injuries
  • Wear evaluation method for articular cartilage injuries

Examples

Experimental program
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Effect test

Embodiment 1

[0026] For bovine articular cartilage with low surface wear. The femoral condyle bone with bovine articular cartilage on the surface was cut into a fan shape with a thickness of 20 mm and a radian of 100°, and the fan-shaped bovine articular cartilage was fixed on the sample fixture with bone cement; the physiological movement of the femoral head was simulated on a swing test machine to gather The ethylene plate sample is used as the grinding pair, under the lubricating effect of 25% calf serum, the load is 150N, the swing frequency is 1Hz, and the swing cycle is 3600 revolutions, and the worn bovine articular cartilage is obtained as follows: figure 2 As shown; the segmented bovine articular cartilage wear area is divided into 13 slices and scanned in the MRI system. During the scanning process, the mode is 256×256 matrix, and the field of view is 20×20mm, so each pixel corresponds to The area is 6084μm 2 , while the slice thickness is 1 mm. Use Analyze8.1 software to perf...

Embodiment 2

[0028] For bovine articular cartilage with severe surface wear. The femoral condyle bone with bovine articular cartilage on the surface was cut into a fan shape with a thickness of 20 mm and a radian of 100°, and the fan-shaped bovine articular cartilage was fixed on the sample fixture with bone cement; the physiological movement of the femoral head was simulated on a swing test machine, and the The flat plate sample is used as the grinding pair, under the lubricating effect of 25% calf serum, the load is 350N, the swing frequency is 1Hz, and the swing cycle is 3600 revolutions, and the severely worn bovine articular cartilage is obtained as follows: Figure 5 As shown; the segmented bovine articular cartilage wear area is divided into 23 slices and scanned in the MRI system. During the scanning process, the mode is 256×256 matrix, and the field of view is 20×20mm, so each pixel corresponds to The area is 6084μm 2 , slice thickness is 1mm. Use Analyze8.1 software to perform ...

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Abstract

The present invention discloses a wear evaluation method for articular cartilage injuries. Firstly, the fresh bovine articular cartilage is extracted from a cow knee joint, and then is cut to be sector-shaped, wherein the sector-shaped bovine articular cartilage is 20 mm in thickness and 100 degrees in radian. Secondly, the sector-shaped bovine articular cartilage is fixed onto a sample holder through bone cement. Thirdly, the physiological motion of a femoral head is simulated on a swing tester, so that the frictional wear test can be completed. Fourthly, the worn part of the sector-shaped bovine articular cartilage is divided into 10-50 slices, and the 10-50 slices are scanned in a nuclear magnetic resonance system, wherein the scanning mode is in the form of a 256*256 matrix and the scanning field-of-view is 20*20 mm. The thicknesses of the 10-50 slices are 1mm. Fifthly, the original joint surface and the highlighted worn part of each slice are subjected to the curve-fitting treatment by utilizing the ANALYZE 8.1 software, so that the area of the worn part can be accurately calculated. Sixthly, the area of the worn parts of all the slices is subjected to the integral operation, so that the volume of the worn part of the bovine articular cartilage is obtained. In this way, bovine articular cartilage injuries can be evaluated. Based on the above method, the wear extent of articular cartilage can be accurately measured. Therefore, the method provides a theoretical basis for the research on the frictional wear characteristics of articular cartilage.

Description

technical field [0001] The invention relates to an evaluation method, in particular to an evaluation method for articular cartilage damage and wear that can accurately measure the wear volume of various articular cartilages. Background technique [0002] Articular cartilage plays an important role in joint movement. However, when a person reaches a certain age, the fibrous degeneration and elasticity of the joints will weaken, the extension ability of the articular cartilage will gradually weaken, and the ability to restore the original shape will weaken; the articular cartilage will be easily damaged and worn, which will cause degenerative arthritis. Assessment of damage is important. [0003] Under experimental conditions, there are currently many studies on the friction and wear behavior between joints and biomedical materials in the world, involving the measurement of the friction coefficient of articular cartilage and the evaluation of surface damage. At present, the ...

Claims

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Application Information

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IPC IPC(8): G01B7/00G01B7/28
Inventor 罗勇杨婷刘秋真刘星星应鹏展
Owner CHINA UNIV OF MINING & TECH
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