fa Morphometry Morphometry Original Original <strong>Purpose</strong>: The best sperm selection by its binding ability to hyaluronic acid for ICSI and assessment of correlation between sperm binding ability to hyaluronic acid with sperm parameters, protamine deficiency and DNA fragmentation.<br> <strong>Materials and Methods</strong>: Semen samples collected from 55 infertile couples referring to ?? Fertility and Infertility center were collected during this study. Semen analysis was carried out according to WHO criteria. By incubation sperm to hyaluronic acid within microinjection dishes, can measure percentage of sperm binding to hyaluronic acid. Sperm morphology, protamine deficiency and DNA fragmentation were assessed by Papanicolaou staining, Chromomycin A3 (CMA3) staining, and SCD test, respectively.<br> <strong>Results</strong>: Percentage of sperm binding to hyaluronic acid has significant negative correlation with percentage of abnormal morphology (p=0.001) whereas a significant positive correlation was obtained with sperm concentration (p=0.001) and motility (p=0.001). Also, percentage of sperm binding to hyaluronic acid has significant negative correlation with protamine deficiency (p=0.028) and DNA fragmentation (p=0.035).<br> <strong>Conclusion</strong>: The results of present study suggest that sperm binding to hyaluronic acid show normal morphology and intact chromatin structure. Thus, we could select the best sperm for ICSI that binds to hyaluronic acid. Hyaluronic acid, Sperm morphology, Protamine deficiency, Sperm DNA fragmentation 49 59 http://anatomyjournal.ir/browse.php?a_code=A-10-304-159&slc_lang=fa&sid=1 Shahnaz Razavi 10031947532846006450 10031947532846006450 Yes Farhad Fathi 10031947532846006451 10031947532846006451 No Marziyeh Tavalaei 10031947532846006452 10031947532846006452 No Akbar Vahdati 10031947532846006453 10031947532846006453 No Mohammad Hosein Nasr Esfahani 10031947532846006454 10031947532846006454 No Royan Institute, Embryology Department, Tehran, Iran.