Mike Matheny, M.S., ATC, clinical associate professor, and head athletic trainer; and Andy Getzin, M.D., medical director for athletic teams, published a case review, titled "Retroperitoneal Hematoma Secondary to Iliac Crest Contusion in a Football Player" in the March 2008 issue of Athletic Therapy Today.
https://www.ithaca.edu/intercom/article.php/20080528084703288