His main research area is sports injury prevention, with a primary focus on biomechanical analysis of serious knee injuries in various sports. He defended his PhD thesis on the topic "Video analysis of the mechanisms for ACL injuries" in August 2006. In the PhD work he developed a new method for extracting detailed joint motion from videos of real injury situations. The method is used by researchers world-wide to investigate e.g. ankle sprains and head impacts in various sports.