The overall perforation rate was 2.1 per 1000 insertions for LNG-IUS users 1.6 per 1000 insertions for copper-IUD users……. LNG-IUS users had a borderline higher risk of perforation compared with copper-IUD users.
Forty-five (58%) of the 77 perforations were associated with suspected risk factors……
Breastfeeding…… and time since delivery remained significant risk factors in perforations detected after 12 months.
No perforations resulted in serious injury to intra-abdominal or pelvic structures.