RT Journal Article SR Electronic T1 Effort thrombosis in an American football player. JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 15 OP 15 DO 10.1136/bjsm.24.1.15 VO 24 IS 1 A1 D A Gorard YR 1990 UL http://bjsm.bmj.com/content/24/1/15.abstract AB A case of lower limb venous thrombosis occurring in a young male after playing American football is described. The features are compared to the more widely recognized effort thrombosis of the upper limb veins. The possibility of effort thrombosis needs to be considered in athletes presenting with leg injuries.