| Summary: | Background: Interaction between the embryo and endometrium plus endometrial receptivity is considered as two strong issues affecting the implantation outcome. Purpose: To investigate the effect of local endometrial scratching on pregnancy rate after failed previous intra uterine insemination. Study design: A prospective, randomized, control trial. Setting: At Cytogenetic and Endoscopy Unit, Zagazig University Hospital. Patients and methods: A total of 226 women either with unexplained or with mild male factor infertility were divided randomly into approximately two groups: in study group, 114 women and in control group, 112 women. For both groups, folliculometry was started at cycle day 7 additionally and at the same setting; endometrial scratching was done only for the study group. Outcome results: Biochemical and clinical pregnancy rates. Results: The biochemical and clinical pregnancy rates were significantly higher in the endometrial scratching group compared to the control group [27/106 (25.5%) vs. 15/106 (14.1%) p = 0.03 and 24/106 (22.6%) vs. 12/106 (11.3%); p = 0.02] respectively. Also, ongoing pregnancy rate was statistically significantly different between both groups [22/106 (20.7%) vs. 11/106 (10.4%); p = 0.03]. Conclusion: Endometrial scratching is useful in increasing pregnancy rates after failed previous intra uterine insemination trials when it is performed in the mid proliferative phase.
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