Chris Madden, MD of #LongsPeak #SportsMedicine presented the #AMSSM 2015 Exchange Lecture on Friday, May 29 at the #ACSM Annual Meeting in San Diego, California. The Immediate Past President of AMSSM is invited to present the exchange lecture yearly at the ACSM Annual Meeting, part of an ongoing exchange between AMSSM and ACSM. This year, Madden discussed the unique challenges and limitations facing the mountain biking medical literature, reviewed what studies have adequately addressed, identified the many areas where evidence is lacking, and filled in the gaps with expert and anecdotal experience regarding mountain biking injuries. Injuries were broken down into three categories: acute traumatic, overuse, and environment-related. Each area was discussed in relation to both the rider and the bike, both important considerations when addressing injury causes, treatment, and prevention. Madden also authors a chapter on the topic in a book he co-edits and authors various chapters in, #NetterSportsMedicine, which is the most comprehensive piece of literature addressing #mountainbiking injuries to date. Madden is an avid mountain biker and enjoys working with many fellow mountain bikers in his practice, #LongsPeakSportsMedicine. However, he much prefers to ride trails than lecture and author chapters about the sport!