In January 1989 THE PHYSICIAN AND SPORTSMEDICINE published a list of professional organizations and resource groups that represented the growing diversity in the field of sports medicine. The list now includes government agencies, sports-related groups, and academic centers that are active in tracking sports injuries.All entries have been updated. The list is divided into three segments: 40 sports medicine organizations, 21 groups and committees that generate sports medicine information, and 17 statistics-gathering groups. Some groups appear more than once; they have been cross-referenced in each instance. Entries in all three segments have been arranged alphabetically. When appropriate, we have given the name of an administrative head along with the chief elected officer.While THE PHYSICIAN AND SPORTSMEDICINE does not endorse any of the groups listed, we do encourage readers to contact the ones that interest them. We have included only the essential information about each group; more detailed descriptions can be obtained by calling or writing to the particular group you are interested in.Readers who would like their organization to be added to next year's list should contact THE PHYSICIAN AND SPORTSMEDICINE, Organizations Project, 4530 W 77th St, Minneapolis, MN 55435.