In brief:Each year at Indiana University in Bloomington, there is a relay in which teams of women mount and dismount specially made tricycles in a race against the clock. This paper reports on 11 cases of anterior cruciate ligament injuries in 504 participants. All of these injuries were caused by a twist or fall during the dismount from the tricycle. Seven of the 11 patients chose either arthroscopy or reconstruction of the anterior cruciate ligament. The other four patients elected a conservative approach to treatment. The authors recommend that two tricycles be used by each team to eliminate the need for a dismount.