The aim of this study is to investigate that the efficacy of the endometrial injury before IVF in recurrent implantation failure patients.

This is a prospective and randomized controlled trial investigating the effect of hysteroscopic endometrial injury for treatment of recurrent implantation failure. Approximately 230 patients who had failed to achieve a clinical pregnancy after the transfer of at least four good-quality embryos in a minimum of three fresh or frozen cycles to a woman under the age of 40 years will be randomized into two groups. Injury group will receive endometrial injury during their hysteroscopic procedure, whereas the control group (n=115) did not. This study will investigate that, whether the endometrial injury is beneficial in recurrent implantation failure patients to increase the odds of clinical pregnancy rates, live birth rates, and implantation rates.

Inclusion Criteria:

• Women under the age of 40 who met the RIF definition
• Patients whose follicle-stimulating hormone (FSH) levels were ≤ 15 IU/mL

Exclusion Criteria:

• Patients with congenital uterine anomalies
• Patients with Asherman's syndrome
• Patients with uterine cavity distorted by myoma or endometrial polyps
• Patients with confirmed endometriosis or endometrioma
• Patients with BMI of <18.5 and >29.9

Only women with recurrent implantation failure