As part of the AAOS 75th Anniversary celebrations, AAOS Now will publish an historic photo or trivia quiz in each issue. The challenge starts now. Readers are invited to participate by identifying the individuals featured in this photograph.

Send your list to AAOS Now at aaoscomm@aaos.org or mail it to AAOS Now, 6300 N. River Rd., Rosemont, IL 60018. If you are among those to correctly identify all the individuals shown, you will be recognized in an upcoming issue.

Bonus questions: When, where, and why was the photo taken?