New approaches to male infertility: IVF and microinjection.

The male factor represents a major problem in the treatment of infertility. New methods of assisted fertilization such as partial zona dissection (PZD), subzonal sperm injection (SUZI) and intracytoplasmic sperm injection (ICSI) are described and discussed in terms of their potential benefits for infertility treatment in comparison to classical in-vitro fertilization (IVF) and intra-uterine insemination (IUI).