Round-headed spermatozoa in semen specimens from fertile and subfertile men.

Objective: To investigate the frequency of round-headed, or acrosomeless, spermatozoa, determine the percentage and evaluate the possible correlation with other semen parameters.

Study Design: Semen specimens from 114 subfertile men aged 24-53 years (mean +/- SD 33.3 +/- 6.