[Risks of urogenital infections and expulsion associated with the combination of an IUD and a menstrual cup]

Objectives: The increase in intrauterine devices (IUDs) contraception, and the growing use of reusables menstrual hygiene products such as the menstrual cup, necessitates an assessment of the implications of their co-use. The objectives are to assess whether women with IUDs who use menstrual cups have an increased risk of IUD expulsion and/or a change in the risk of upper and lower urogenital tract infections compared to women who use other menstrual hygiene products.

Method: An observational, prospective, multicenter study was conducted in France between 2020 and 2023. Participants were recruited by health professionals and data were collected by telephone questionnaire at the time of IUD insertion and at one year. The primary endpoints were the occurrence of IUD expulsion and the occurrence of urogenital tract infections in menstrual cup users compared to non-users.

Results: One hundred and three women out of 119 included were analyzed, 25 of them were regular menstrual cup users and five experienced IUD expulsion. Among regular users, 12% experienced IUD expulsion compared to 2.6% among non-users, with no statistically significant difference (Chi²=3.65; P=0.056). Regarding urogenital tract infections, nine women (36%) of the regular menstrual cup users had urogenital infections, compared with 27 (34.6%) of the non-users or not regular users, with no statistically significant difference.

Conclusion: The tendency of menstrual cup users to expel their IUDs is a reason for caution, although it is not sufficient to contraindicate co-use. Physicians should therefore systematically screen such co-use and inform patients of the risks and monitoring instructions.