Anatomical and structural factors.
D000367:Age Factors; D016118:Anterior Cruciate Ligament / Q000033:anatomy & histology; D000070598:Anterior Cruciate Ligament Injuries; D000886:Anthropometry; D001265:Athletic Injuries / Q000453:epidemiology / Q000473:pathology* / Q000534:rehabilitation; D005260:Female; D006801:Humans; D008297:Male; D012737:Sex Factors; D014481:United States / Q000453:epidemiology