The article noted that it was not fully known how such IUDs functioned. Many specialists said that inert IUDs caused a reaction in the uterus that interfered with sperm reaching and fertilizing a woman’s eggs.
نَاقَشَتْ بُرْجُ ٱلْمُرَاقَبَةِ هٰذِهِ ٱلْمَسْأَلَةَ فِي عَدَدِ ١٥ أَيَّارَ (‏ مَايُو )‏ ١٩٧٩ ،‏ ٱلصَّفْحَتَيْنِ ٣٠ -‏ ٣١ (‏ بِٱلْعَرَبِيَّةِ ١ أَيْلُولَ [سِبْتَمْبِر] ١٩٨١ ،‏ ٱلصَّفْحَتَانِ ٦٢ -‏ ٦٣ )‏ .‏