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蠕變特性:正常與壞死股骨頭對比分析

The Contrast Analysis of Creep Properties Between Normal and Necrotic Head of Femur’s

作者: 賈樂生  赤仁杰  樸成東  馬洪順 
單位:沈陽醫(yī)學(xué)院奉天醫(yī)院(沈陽110024)
關(guān)鍵詞: 病態(tài);股骨頭;蠕變;對比分析 
分類號:
出版年·卷·期(頁碼):2011·30·1(92-95)
摘要:

對正常和壞死股骨頭進行蠕變實驗,為新型人工關(guān)節(jié)的研究和髖關(guān)節(jié)置換術(shù)提供蠕變力學(xué)特性參數(shù)。8個正常股骨頭實驗標本取自正常人新鮮尸體,男性,年齡22~28歲;8個股骨頭壞死樣本為股骨頭壞死病人進行人工髖關(guān)節(jié)置換術(shù)后所遺棄,也為男性,年齡28~56歲。利用日本島津電子萬能試驗機,在(36.5±0.5)℃條件下,以0.5MPa/s的應(yīng)力增加速度對標本施加壓力。在7200s的試驗時間內(nèi),采集100個實驗數(shù)據(jù),描繪出蠕變曲線并計算蠕變參數(shù)。實驗結(jié)果表明所有樣本在最初600s內(nèi)蠕變速度較快,之后緩慢上升,7200s時蠕變曲線基本保持平衡,蠕變量與時間呈指數(shù)關(guān)系。壞死組股骨頭7200s蠕變量為0.61%,顯著低于正常組的0.85%(P<0.05)。此結(jié)果證實股骨頭壞死后其蠕變力學(xué)特性發(fā)生改變。

The study on the creep mechanical properties of normal and avascular necrosis of the femoral head(ANFH) is necessary for artificial joint research and joint replacement. In this paper, we measured the creep values of femur. Sixteen experimental fresh femurs were taken from 8 normal male people, aged from 22 to 28 years old, and from 8 male patients, aged from 28 to 56 years old, after artificial joint replacement. Under temperature (36.5±0.5)℃, each specimen was tested with Daojin electronical experimental machine when the acceleration of stress was 0.5MPa/s. In total 7200s period, one hundred experimental data were collected and used for drawing the creep curves and processing the creep parameter. The experiments indicated the creep velocities of all samples were quicker in the early 600s period, and it became slow later until immovably at 7200s. During 7200s, the maximum creep value of pathological femoral head was 0.61%, that was lower than 0.85% of the normal femoral head(P<0.05). It is proved that the creep parameter changes after femoral head femoral head is necrotic.

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