The fertilization rates after IVF and ICSI using normal
sperm are approximately 60% and 70%, respectively [37].
In general, the decision to perform either IVF or ICSI is
dependent on sperm quality [38], which is determined by
the total number of motile sperm [39]. While the concentration
and morphology of ejaculated sperm do not affect
ICSI results, the injection of a completely immotile spermatozoon
is likely to have a negative effect on fertilization
and the pregnancy rate [21,40]. Currently, there is no efficient
therapy for asthenozoospermia.