Hallow Dear,
You seem to have confusion about the
modus operandi of IUI and the pathology in PCOS.
In PCOS, due to
hormonal imbalance, the eggs are not released.
In IUI -
Intrauterine Insemination, the sperms are instilled inside the
uterine cavity to eliminate any factors in the vagina or otherwise and help reach good amount of sperms inside the uterine cavity. These sperms swim towards the released egg and fertilize it in the tube.
If there is no egg release, the sperms inside the uterine cavity will go waste. In PCOS since egg is not getting released, IUI will not work.
Instead in PCOS, by different modalities and treatments available, the egg release should be established and achieved which will be available for fertilization. Then if the other factors like vaginal hostility or
low sperm count are demanding, IUI may be preferred.
I am sure I have made your confusion clear.