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研究了１１２例育龄妇女的子宫内膜腔形态与宫内节育器脱落的关系。发现实验组（３９例）和对照组（７３例）所测宫腔各径线的均数与模拟的宫腔形态均无差异，而在Ｘ线片测环外缘切线的长度和子宫角距两组间差异有高度显著性Ｐ＜０．０１。在宫腔上部形态的５个主型中，仅１型两组有差异，在子宫腔下部形态的４个亚型中，Ｃ型和Ｄ型两组间差异有高度显著性Ｐ＜０．０１，宫腔第一横径与第二横径之差＜５ｍｍ，子宫腔呈桶状，环易下移、脱落或带环受孕。
The relationship between the morphology of endometrial cavity and the shedding of IUD in 112 women of childbearing age was studied. It was found that there was no difference between the average number of uterine cavity and the uterine cavity in the experimental group (39 cases) and the control group (73 cases), while the length of the tangent line and the uterine horn The difference between the two groups was highly significant P <0.01. Among the five main types of the upper part of the uterine cavity, there were differences between the two types in only one type. Among the four subtypes of the lower uterine cavity, there was a highly significant difference between the two groups (P <0.01) , The difference between the first diameter of the uterine cavity and the second diameter of less than 5 mm, the uterine cavity is barrel-shaped, the ring is easy to move down, or fall off the band with conception.