Fluorosis on anterior cruciate ligament stress rel -

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Fluorosis on anterior cruciate ligament Research on effects of stress relaxation

2.1 The stress relaxation experiment with the results of the reading microscope to measure the size of the original sample,[link widoczny dla zalogowanych], the sample length of 9.8-10.2mm, the sample width 2.2-2.4mm, thickness 1.2-1.4mm. Each of the 10 samples taken, samples were first pre-set processing. Anterior cruciate ligament and other soft tissues, like the elastic mainly from the entropy change. Therefore there is no unique natural state. Therefore, samples were first pre-stressed, ie in the same stress level, the unloading curve of elongation than the elongation than the loading curve ratio. And will be unloaded to zero load, and over time can be restored to original condition. Were preset for each sample after the experiment. Samples will be pre-adjusted to the soft tissues were special clamping fixture, the fixture with the plexiglass cylinder connection,[link widoczny dla zalogowanych], a built aquarium saline pH 7.4, the sample placed in saline,[link widoczny dla zalogowanych], with the sample fixture and test machine, the lower clamp connection. Testing machine with an adjustable 250 ℃ 35 ℃ ambient temperature of a box. In this study,[link widoczny dla zalogowanych], the temperature at 37 ℃ environment experiment. In this study,[link widoczny dla zalogowanych], each Chinese Journal of Prevention and Treatment 2007 22 parameters of SVM Khon plastic! Blue!!!: Silk!:! The 10 samples per minute, respectively, 50% of the strain imposed on the sample response rate of increase. When the normal control group to 8.23% strain, the experimental group to reach 6.26% strain, the stress control group reached 3.34MPa, 3.34MPa when the stress reaches the experimental group to maintain a constant strain, stress decreasing with time change . Computer program setting from the time t (0) began collecting data, a data collection for each 0.6S, collecting 10; after a data collection for each 10S, collecting 40; after a data collection for each 136S, collecting 50 data; total 100 data collected, which lasted 7200S. After the set time, the printer automatically prints out the experimental data and curves. 2.2 The results of the control group, the experimental group by computer fitting the experimental curve shown in Figure 1. Normal control group and experimental group normalized stress relaxation function curve shown in Figure 2. Figure 1 Stress relaxation curves of the anterior cruciate ligament anterior cruciate ligament Fig1thestressrelaxationculweofanteriorcruciateligament Figure 2 normalized stress relaxation curves Fig2thenormalizationstressrelaxationculweofanteriorcruciateligament2.3 regression analysis and the results of relaxation curves is based on the relationship between the number of changes, so the set: G v = {. ... X where c, d is a constant to be determined so that 'p (c.d) = [G (t) a real G] is = 0od = f. Σlnt + dΣlnt a ΣG real lnt = 0 {. . . . . . I (2) 【cΣlnt + Σd a ΣG real experimental data into (2) solve the control group and experimental group c, d values into (1) was as follows: control group: G (t) : f0L a 0.0478lrtt +1. O539t = 0 experimental groups: G (t): f '= 0L a 0.02751 rtt +1 · 0619t> 03 discuss the experimental results showed that stress relaxation of the control group 7200S amount 1.28Mpa, the amount of stress relaxation of the experimental group 7200S 0 .86 Mpa. 7200S stress relaxation of the experimental group was significantly lower than the control group (P <0.05). Ligament is mainly composed of collagen fibers. Collagen fibers mainly composed of three; collagen fibers, elastic fibers and reticular fibers. Collagen collagen fibers that have a certain strength and stiffness; elastic fibers to collagen with an extension of the loading capacity; and reticular fibers to provide volume. Analysis, fluorosis damage on the knee, the collagen fibers and elastic fibers, etc., causing varying degrees of damage, so the stress relaxation was reduced.

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