“…According to a retrospective review of 49 651 trauma cases between 1995 and 2001 from 92 trauma centers in the National Pediatric Trauma Database, the incidence of kidney injury necessitating nephrectomy across all sport activities was 0.008% (Johnson et al, 2005). Another literature review showed that renal injury is rare in contact and collision sports (Diokno & Rowe, 2010). Whereas kidney injury is usually caused by motor vehicle accidents, falls, and bicycling, most nephrectomies are attributed to nonsports activities such as motor vehicle accidents and falls (Johnson et al, 2005; McAleer et al, 2002; Psooy, 2006, 2009; Wan et al, 2003a, 2003b; Wu & Gaines, 2007).…”