The use of intracytoplasmic sperm injection (ICSI) has become the mainstay of oocyte fertilization for assisted reproduction. However, the traditional technique requires a motile sperm population for sperm selection. Occasionally, the embryologist is faced with entirely nonmotile sperm populations with no alternative but to use nonmotile cells for injection. The following report describes a successful application of the sperm flexibility test for viable sperm selection from a non-motile population.
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